fs/cifs/cifsfs.c

   1 /*
   2  *   fs/cifs/cifsfs.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2002,2008
   5  *   Author(s): Steve French (sfrench@us.ibm.com)
   6  *
   7  *   Common Internet FileSystem (CIFS) client
   8  *
   9  *   This library is free software; you can redistribute it and/or modify
  10  *   it under the terms of the GNU Lesser General Public License as published
  11  *   by the Free Software Foundation; either version 2.1 of the License, or
  12  *   (at your option) any later version.
  13  *
  14  *   This library is distributed in the hope that it will be useful,
  15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  17  *   the GNU Lesser General Public License for more details.
  18  *
  19  *   You should have received a copy of the GNU Lesser General Public License
  20  *   along with this library; if not, write to the Free Software
  21  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  */
  23
  24 /* Note that BB means BUGBUG (ie something to fix eventually) */
  25
  26 #include <linux/module.h>
  27 #include <linux/fs.h>
  28 #include <linux/mount.h>
  29 #include <linux/slab.h>
  30 #include <linux/init.h>
  31 #include <linux/list.h>
  32 #include <linux/seq_file.h>
  33 #include <linux/vfs.h>
  34 #include <linux/mempool.h>
  35 #include <linux/delay.h>
  36 #include <linux/kthread.h>
  37 #include <linux/freezer.h>
  38 #include <linux/namei.h>
  39 #include <linux/random.h>
  40 #include <linux/uuid.h>
  41 #include <linux/xattr.h>
  42 #include <net/ipv6.h>
  43 #include "cifsfs.h"
  44 #include "cifspdu.h"
  45 #define DECLARE_GLOBALS_HERE
  46 #include "cifsglob.h"
  47 #include "cifsproto.h"
  48 #include "cifs_debug.h"
  49 #include "cifs_fs_sb.h"
  50 #include <linux/mm.h>
  51 #include <linux/key-type.h>
  52 #include "cifs_spnego.h"
  53 #include "fscache.h"
  54 #include "smb2pdu.h"
  55
  56 int cifsFYI = 0;
  57 bool traceSMB;
  58 bool enable_oplocks = true;
  59 bool linuxExtEnabled = true;
  60 bool lookupCacheEnabled = true;
  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, 0444);
  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, 0444);
  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, 0444);
  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 struct workqueue_struct *cifsoplockd_wq;
  90 __u32 cifs_lock_secret;
  91
  92 /*
  93  * Bumps refcount for cifs super block.
  94  * Note that it should be only called if a referece to VFS super block is
  95  * already held, e.g. in open-type syscalls context. Otherwise it can race with
  96  * atomic_dec_and_test in deactivate_locked_super.
  97  */
  98 void
  99 cifs_sb_active(struct super_block *sb)
 100 {
 101         struct cifs_sb_info *server = CIFS_SB(sb);
 102
 103         if (atomic_inc_return(&server->active) == 1)
 104                 atomic_inc(&sb->s_active);
 105 }
 106
 107 void
 108 cifs_sb_deactive(struct super_block *sb)
 109 {
 110         struct cifs_sb_info *server = CIFS_SB(sb);
 111
 112         if (atomic_dec_and_test(&server->active))
 113                 deactivate_super(sb);
 114 }
 115
 116 static int
 117 cifs_read_super(struct super_block *sb)
 118 {
 119         struct inode *inode;
 120         struct cifs_sb_info *cifs_sb;
 121         struct cifs_tcon *tcon;
 122         int rc = 0;
 123
 124         cifs_sb = CIFS_SB(sb);
 125         tcon = cifs_sb_master_tcon(cifs_sb);
 126
 127         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIXACL)
 128                 sb->s_flags |= SB_POSIXACL;
 129
 130         if (tcon->ses->capabilities & tcon->ses->server->vals->cap_large_files)
 131                 sb->s_maxbytes = MAX_LFS_FILESIZE;
 132         else
 133                 sb->s_maxbytes = MAX_NON_LFS;
 134
 135         /* BB FIXME fix time_gran to be larger for LANMAN sessions */
 136         sb->s_time_gran = 100;
 137
 138         sb->s_magic = CIFS_MAGIC_NUMBER;
 139         sb->s_op = &cifs_super_ops;
 140         sb->s_xattr = cifs_xattr_handlers;
 141         rc = super_setup_bdi(sb);
 142         if (rc)
 143                 goto out_no_root;
 144         /* tune readahead according to rsize */
 145         sb->s_bdi->ra_pages = cifs_sb->rsize / PAGE_SIZE;
 146
 147         sb->s_blocksize = CIFS_MAX_MSGSIZE;
 148         sb->s_blocksize_bits = 14;      /* default 2**14 = CIFS_MAX_MSGSIZE */
 149         inode = cifs_root_iget(sb);
 150
 151         if (IS_ERR(inode)) {
 152                 rc = PTR_ERR(inode);
 153                 goto out_no_root;
 154         }
 155
 156         if (tcon->nocase)
 157                 sb->s_d_op = &cifs_ci_dentry_ops;
 158         else
 159                 sb->s_d_op = &cifs_dentry_ops;
 160
 161         sb->s_root = d_make_root(inode);
 162         if (!sb->s_root) {
 163                 rc = -ENOMEM;
 164                 goto out_no_root;
 165         }
 166
 167 #ifdef CONFIG_CIFS_NFSD_EXPORT
 168         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 169                 cifs_dbg(FYI, "export ops supported\n");
 170                 sb->s_export_op = &cifs_export_ops;
 171         }
 172 #endif /* CONFIG_CIFS_NFSD_EXPORT */
 173
 174         return 0;
 175
 176 out_no_root:
 177         cifs_dbg(VFS, "%s: get root inode failed\n", __func__);
 178         return rc;
 179 }
 180
 181 static void cifs_kill_sb(struct super_block *sb)
 182 {
 183         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 184         kill_anon_super(sb);
 185         cifs_umount(cifs_sb);
 186 }
 187
 188 static int
 189 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
 190 {
 191         struct super_block *sb = dentry->d_sb;
 192         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 193         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
 194         struct TCP_Server_Info *server = tcon->ses->server;
 195         unsigned int xid;
 196         int rc = 0;
 197
 198         xid = get_xid();
 199
 200         /*
 201          * PATH_MAX may be too long - it would presumably be total path,
 202          * but note that some servers (includinng Samba 3) have a shorter
 203          * maximum path.
 204          *
 205          * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
 206          */
 207         buf->f_namelen = PATH_MAX;
 208         buf->f_files = 0;       /* undefined */
 209         buf->f_ffree = 0;       /* unlimited */
 210
 211         if (server->ops->queryfs)
 212                 rc = server->ops->queryfs(xid, tcon, buf);
 213
 214         free_xid(xid);
 215         return 0;
 216 }
 217
 218 static long cifs_fallocate(struct file *file, int mode, loff_t off, loff_t len)
 219 {
 220         struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file);
 221         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
 222         struct TCP_Server_Info *server = tcon->ses->server;
 223
 224         if (server->ops->fallocate)
 225                 return server->ops->fallocate(file, tcon, mode, off, len);
 226
 227         return -EOPNOTSUPP;
 228 }
 229
 230 static int cifs_permission(struct inode *inode, int mask)
 231 {
 232         struct cifs_sb_info *cifs_sb;
 233
 234         cifs_sb = CIFS_SB(inode->i_sb);
 235
 236         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
 237                 if ((mask & MAY_EXEC) && !execute_ok(inode))
 238                         return -EACCES;
 239                 else
 240                         return 0;
 241         } else /* file mode might have been restricted at mount time
 242                 on the client (above and beyond ACL on servers) for
 243                 servers which do not support setting and viewing mode bits,
 244                 so allowing client to check permissions is useful */
 245                 return generic_permission(inode, mask);
 246 }
 247
 248 static struct kmem_cache *cifs_inode_cachep;
 249 static struct kmem_cache *cifs_req_cachep;
 250 static struct kmem_cache *cifs_mid_cachep;
 251 static struct kmem_cache *cifs_sm_req_cachep;
 252 mempool_t *cifs_sm_req_poolp;
 253 mempool_t *cifs_req_poolp;
 254 mempool_t *cifs_mid_poolp;
 255
 256 static struct inode *
 257 cifs_alloc_inode(struct super_block *sb)
 258 {
 259         struct cifsInodeInfo *cifs_inode;
 260         cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
 261         if (!cifs_inode)
 262                 return NULL;
 263         cifs_inode->cifsAttrs = 0x20;   /* default */
 264         cifs_inode->time = 0;
 265         /*
 266          * Until the file is open and we have gotten oplock info back from the
 267          * server, can not assume caching of file data or metadata.
 268          */
 269         cifs_set_oplock_level(cifs_inode, 0);
 270         cifs_inode->flags = 0;
 271         spin_lock_init(&cifs_inode->writers_lock);
 272         cifs_inode->writers = 0;
 273         cifs_inode->vfs_inode.i_blkbits = 14;  /* 2**14 = CIFS_MAX_MSGSIZE */
 274         cifs_inode->server_eof = 0;
 275         cifs_inode->uniqueid = 0;
 276         cifs_inode->createtime = 0;
 277         cifs_inode->epoch = 0;
 278         generate_random_uuid(cifs_inode->lease_key);
 279
 280         /*
 281          * Can not set i_flags here - they get immediately overwritten to zero
 282          * by the VFS.
 283          */
 284         /* cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME; */
 285         INIT_LIST_HEAD(&cifs_inode->openFileList);
 286         INIT_LIST_HEAD(&cifs_inode->llist);
 287         return &cifs_inode->vfs_inode;
 288 }
 289
 290 static void cifs_i_callback(struct rcu_head *head)
 291 {
 292         struct inode *inode = container_of(head, struct inode, i_rcu);
 293         kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
 294 }
 295
 296 static void
 297 cifs_destroy_inode(struct inode *inode)
 298 {
 299         call_rcu(&inode->i_rcu, cifs_i_callback);
 300 }
 301
 302 static void
 303 cifs_evict_inode(struct inode *inode)
 304 {
 305         truncate_inode_pages_final(&inode->i_data);
 306         clear_inode(inode);
 307         cifs_fscache_release_inode_cookie(inode);
 308 }
 309
 310 static void
 311 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
 312 {
 313         struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
 314         struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
 315
 316         seq_puts(s, ",addr=");
 317
 318         switch (server->dstaddr.ss_family) {
 319         case AF_INET:
 320                 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
 321                 break;
 322         case AF_INET6:
 323                 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
 324                 if (sa6->sin6_scope_id)
 325                         seq_printf(s, "%%%u", sa6->sin6_scope_id);
 326                 break;
 327         default:
 328                 seq_puts(s, "(unknown)");
 329         }
 330 }
 331
 332 static void
 333 cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
 334 {
 335         if (ses->sectype == Unspecified) {
 336                 if (ses->user_name == NULL)
 337                         seq_puts(s, ",sec=none");
 338                 return;
 339         }
 340
 341         seq_puts(s, ",sec=");
 342
 343         switch (ses->sectype) {
 344         case LANMAN:
 345                 seq_puts(s, "lanman");
 346                 break;
 347         case NTLMv2:
 348                 seq_puts(s, "ntlmv2");
 349                 break;
 350         case NTLM:
 351                 seq_puts(s, "ntlm");
 352                 break;
 353         case Kerberos:
 354                 seq_puts(s, "krb5");
 355                 break;
 356         case RawNTLMSSP:
 357                 seq_puts(s, "ntlmssp");
 358                 break;
 359         default:
 360                 /* shouldn't ever happen */
 361                 seq_puts(s, "unknown");
 362                 break;
 363         }
 364
 365         if (ses->sign)
 366                 seq_puts(s, "i");
 367 }
 368
 369 static void
 370 cifs_show_cache_flavor(struct seq_file *s, struct cifs_sb_info *cifs_sb)
 371 {
 372         seq_puts(s, ",cache=");
 373
 374         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
 375                 seq_puts(s, "strict");
 376         else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
 377                 seq_puts(s, "none");
 378         else
 379                 seq_puts(s, "loose");
 380 }
 381
 382 static void
 383 cifs_show_nls(struct seq_file *s, struct nls_table *cur)
 384 {
 385         struct nls_table *def;
 386
 387         /* Display iocharset= option if it's not default charset */
 388         def = load_nls_default();
 389         if (def != cur)
 390                 seq_printf(s, ",iocharset=%s", cur->charset);
 391         unload_nls(def);
 392 }
 393
 394 /*
 395  * cifs_show_options() is for displaying mount options in /proc/mounts.
 396  * Not all settable options are displayed but most of the important
 397  * ones are.
 398  */
 399 static int
 400 cifs_show_options(struct seq_file *s, struct dentry *root)
 401 {
 402         struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
 403         struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);
 404         struct sockaddr *srcaddr;
 405         srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
 406
 407         seq_show_option(s, "vers", tcon->ses->server->vals->version_string);
 408         cifs_show_security(s, tcon->ses);
 409         cifs_show_cache_flavor(s, cifs_sb);
 410
 411         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
 412                 seq_puts(s, ",multiuser");
 413         else if (tcon->ses->user_name)
 414                 seq_show_option(s, "username", tcon->ses->user_name);
 415
 416         if (tcon->ses->domainName)
 417                 seq_show_option(s, "domain", tcon->ses->domainName);
 418
 419         if (srcaddr->sa_family != AF_UNSPEC) {
 420                 struct sockaddr_in *saddr4;
 421                 struct sockaddr_in6 *saddr6;
 422                 saddr4 = (struct sockaddr_in *)srcaddr;
 423                 saddr6 = (struct sockaddr_in6 *)srcaddr;
 424                 if (srcaddr->sa_family == AF_INET6)
 425                         seq_printf(s, ",srcaddr=%pI6c",
 426                                    &saddr6->sin6_addr);
 427                 else if (srcaddr->sa_family == AF_INET)
 428                         seq_printf(s, ",srcaddr=%pI4",
 429                                    &saddr4->sin_addr.s_addr);
 430                 else
 431                         seq_printf(s, ",srcaddr=BAD-AF:%i",
 432                                    (int)(srcaddr->sa_family));
 433         }
 434
 435         seq_printf(s, ",uid=%u",
 436                    from_kuid_munged(&init_user_ns, cifs_sb->mnt_uid));
 437         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
 438                 seq_puts(s, ",forceuid");
 439         else
 440                 seq_puts(s, ",noforceuid");
 441
 442         seq_printf(s, ",gid=%u",
 443                    from_kgid_munged(&init_user_ns, cifs_sb->mnt_gid));
 444         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
 445                 seq_puts(s, ",forcegid");
 446         else
 447                 seq_puts(s, ",noforcegid");
 448
 449         cifs_show_address(s, tcon->ses->server);
 450
 451         if (!tcon->unix_ext)
 452                 seq_printf(s, ",file_mode=0%ho,dir_mode=0%ho",
 453                                            cifs_sb->mnt_file_mode,
 454                                            cifs_sb->mnt_dir_mode);
 455
 456         cifs_show_nls(s, cifs_sb->local_nls);
 457
 458         if (tcon->seal)
 459                 seq_puts(s, ",seal");
 460         if (tcon->nocase)
 461                 seq_puts(s, ",nocase");
 462         if (tcon->retry)
 463                 seq_puts(s, ",hard");
 464         else
 465                 seq_puts(s, ",soft");
 466         if (tcon->use_persistent)
 467                 seq_puts(s, ",persistenthandles");
 468         else if (tcon->use_resilient)
 469                 seq_puts(s, ",resilienthandles");
 470         if (tcon->unix_ext)
 471                 seq_puts(s, ",unix");
 472         else
 473                 seq_puts(s, ",nounix");
 474         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 475                 seq_puts(s, ",posixpaths");
 476         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
 477                 seq_puts(s, ",setuids");
 478         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UID_FROM_ACL)
 479                 seq_puts(s, ",idsfromsid");
 480         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 481                 seq_puts(s, ",serverino");
 482         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD)
 483                 seq_puts(s, ",rwpidforward");
 484         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL)
 485                 seq_puts(s, ",forcemand");
 486         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 487                 seq_puts(s, ",nouser_xattr");
 488         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 489                 seq_puts(s, ",mapchars");
 490         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR)
 491                 seq_puts(s, ",mapposix");
 492         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
 493                 seq_puts(s, ",sfu");
 494         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 495                 seq_puts(s, ",nobrl");
 496         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
 497                 seq_puts(s, ",cifsacl");
 498         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
 499                 seq_puts(s, ",dynperm");
 500         if (root->d_sb->s_flags & SB_POSIXACL)
 501                 seq_puts(s, ",acl");
 502         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
 503                 seq_puts(s, ",mfsymlinks");
 504         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
 505                 seq_puts(s, ",fsc");
 506         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)
 507                 seq_puts(s, ",nostrictsync");
 508         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM)
 509                 seq_puts(s, ",noperm");
 510         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPUID)
 511                 seq_printf(s, ",backupuid=%u",
 512                            from_kuid_munged(&init_user_ns,
 513                                             cifs_sb->mnt_backupuid));
 514         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_BACKUPGID)
 515                 seq_printf(s, ",backupgid=%u",
 516                            from_kgid_munged(&init_user_ns,
 517                                             cifs_sb->mnt_backupgid));
 518
 519         seq_printf(s, ",rsize=%u", cifs_sb->rsize);
 520         seq_printf(s, ",wsize=%u", cifs_sb->wsize);
 521         seq_printf(s, ",echo_interval=%lu",
 522                         tcon->ses->server->echo_interval / HZ);
 523         /* convert actimeo and display it in seconds */
 524         seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
 525
 526         return 0;
 527 }
 528
 529 static void cifs_umount_begin(struct super_block *sb)
 530 {
 531         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 532         struct cifs_tcon *tcon;
 533
 534         if (cifs_sb == NULL)
 535                 return;
 536
 537         tcon = cifs_sb_master_tcon(cifs_sb);
 538
 539         spin_lock(&cifs_tcp_ses_lock);
 540         if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
 541                 /* we have other mounts to same share or we have
 542                    already tried to force umount this and woken up
 543                    all waiting network requests, nothing to do */
 544                 spin_unlock(&cifs_tcp_ses_lock);
 545                 return;
 546         } else if (tcon->tc_count == 1)
 547                 tcon->tidStatus = CifsExiting;
 548         spin_unlock(&cifs_tcp_ses_lock);
 549
 550         /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
 551         /* cancel_notify_requests(tcon); */
 552         if (tcon->ses && tcon->ses->server) {
 553                 cifs_dbg(FYI, "wake up tasks now - umount begin not complete\n");
 554                 wake_up_all(&tcon->ses->server->request_q);
 555                 wake_up_all(&tcon->ses->server->response_q);
 556                 msleep(1); /* yield */
 557                 /* we have to kick the requests once more */
 558                 wake_up_all(&tcon->ses->server->response_q);
 559                 msleep(1);
 560         }
 561
 562         return;
 563 }
 564
 565 #ifdef CONFIG_CIFS_STATS2
 566 static int cifs_show_stats(struct seq_file *s, struct dentry *root)
 567 {
 568         /* BB FIXME */
 569         return 0;
 570 }
 571 #endif
 572
 573 static int cifs_remount(struct super_block *sb, int *flags, char *data)
 574 {
 575         sync_filesystem(sb);
 576         *flags |= SB_NODIRATIME;
 577         return 0;
 578 }
 579
 580 static int cifs_drop_inode(struct inode *inode)
 581 {
 582         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 583
 584         /* no serverino => unconditional eviction */
 585         return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
 586                 generic_drop_inode(inode);
 587 }
 588
 589 static const struct super_operations cifs_super_ops = {
 590         .statfs = cifs_statfs,
 591         .alloc_inode = cifs_alloc_inode,
 592         .destroy_inode = cifs_destroy_inode,
 593         .drop_inode     = cifs_drop_inode,
 594         .evict_inode    = cifs_evict_inode,
 595 /*      .delete_inode   = cifs_delete_inode,  */  /* Do not need above
 596         function unless later we add lazy close of inodes or unless the
 597         kernel forgets to call us with the same number of releases (closes)
 598         as opens */
 599         .show_options = cifs_show_options,
 600         .umount_begin   = cifs_umount_begin,
 601         .remount_fs = cifs_remount,
 602 #ifdef CONFIG_CIFS_STATS2
 603         .show_stats = cifs_show_stats,
 604 #endif
 605 };
 606
 607 /*
 608  * Get root dentry from superblock according to prefix path mount option.
 609  * Return dentry with refcount + 1 on success and NULL otherwise.
 610  */
 611 static struct dentry *
 612 cifs_get_root(struct smb_vol *vol, struct super_block *sb)
 613 {
 614         struct dentry *dentry;
 615         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 616         char *full_path = NULL;
 617         char *s, *p;
 618         char sep;
 619
 620         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH)
 621                 return dget(sb->s_root);
 622
 623         full_path = cifs_build_path_to_root(vol, cifs_sb,
 624                                 cifs_sb_master_tcon(cifs_sb), 0);
 625         if (full_path == NULL)
 626                 return ERR_PTR(-ENOMEM);
 627
 628         cifs_dbg(FYI, "Get root dentry for %s\n", full_path);
 629
 630         sep = CIFS_DIR_SEP(cifs_sb);
 631         dentry = dget(sb->s_root);
 632         p = s = full_path;
 633
 634         do {
 635                 struct inode *dir = d_inode(dentry);
 636                 struct dentry *child;
 637
 638                 if (!dir) {
 639                         dput(dentry);
 640                         dentry = ERR_PTR(-ENOENT);
 641                         break;
 642                 }
 643                 if (!S_ISDIR(dir->i_mode)) {
 644                         dput(dentry);
 645                         dentry = ERR_PTR(-ENOTDIR);
 646                         break;
 647                 }
 648
 649                 /* skip separators */
 650                 while (*s == sep)
 651                         s++;
 652                 if (!*s)
 653                         break;
 654                 p = s++;
 655                 /* next separator */
 656                 while (*s && *s != sep)
 657                         s++;
 658
 659                 child = lookup_one_len_unlocked(p, dentry, s - p);
 660                 dput(dentry);
 661                 dentry = child;
 662         } while (!IS_ERR(dentry));
 663         kfree(full_path);
 664         return dentry;
 665 }
 666
 667 static int cifs_set_super(struct super_block *sb, void *data)
 668 {
 669         struct cifs_mnt_data *mnt_data = data;
 670         sb->s_fs_info = mnt_data->cifs_sb;
 671         return set_anon_super(sb, NULL);
 672 }
 673
 674 static struct dentry *
 675 cifs_do_mount(struct file_system_type *fs_type,
 676               int flags, const char *dev_name, void *data)
 677 {
 678         int rc;
 679         struct super_block *sb;
 680         struct cifs_sb_info *cifs_sb;
 681         struct smb_vol *volume_info;
 682         struct cifs_mnt_data mnt_data;
 683         struct dentry *root;
 684
 685         cifs_dbg(FYI, "Devname: %s flags: %d\n", dev_name, flags);
 686
 687         volume_info = cifs_get_volume_info((char *)data, dev_name);
 688         if (IS_ERR(volume_info))
 689                 return ERR_CAST(volume_info);
 690
 691         cifs_sb = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
 692         if (cifs_sb == NULL) {
 693                 root = ERR_PTR(-ENOMEM);
 694                 goto out_nls;
 695         }
 696
 697         cifs_sb->mountdata = kstrndup(data, PAGE_SIZE, GFP_KERNEL);
 698         if (cifs_sb->mountdata == NULL) {
 699                 root = ERR_PTR(-ENOMEM);
 700                 goto out_free;
 701         }
 702
 703         rc = cifs_setup_cifs_sb(volume_info, cifs_sb);
 704         if (rc) {
 705                 root = ERR_PTR(rc);
 706                 goto out_free;
 707         }
 708
 709         rc = cifs_mount(cifs_sb, volume_info);
 710         if (rc) {
 711                 if (!(flags & SB_SILENT))
 712                         cifs_dbg(VFS, "cifs_mount failed w/return code = %d\n",
 713                                  rc);
 714                 root = ERR_PTR(rc);
 715                 goto out_free;
 716         }
 717
 718         mnt_data.vol = volume_info;
 719         mnt_data.cifs_sb = cifs_sb;
 720         mnt_data.flags = flags;
 721
 722         /* BB should we make this contingent on mount parm? */
 723         flags |= SB_NODIRATIME | SB_NOATIME;
 724
 725         sb = sget(fs_type, cifs_match_super, cifs_set_super, flags, &mnt_data);
 726         if (IS_ERR(sb)) {
 727                 root = ERR_CAST(sb);
 728                 cifs_umount(cifs_sb);
 729                 goto out;
 730         }
 731
 732         if (sb->s_root) {
 733                 cifs_dbg(FYI, "Use existing superblock\n");
 734                 cifs_umount(cifs_sb);
 735         } else {
 736                 rc = cifs_read_super(sb);
 737                 if (rc) {
 738                         root = ERR_PTR(rc);
 739                         goto out_super;
 740                 }
 741
 742                 sb->s_flags |= SB_ACTIVE;
 743         }
 744
 745         root = cifs_get_root(volume_info, sb);
 746         if (IS_ERR(root))
 747                 goto out_super;
 748
 749         cifs_dbg(FYI, "dentry root is: %p\n", root);
 750         goto out;
 751
 752 out_super:
 753         deactivate_locked_super(sb);
 754 out:
 755         cifs_cleanup_volume_info(volume_info);
 756         return root;
 757
 758 out_free:
 759         kfree(cifs_sb->prepath);
 760         kfree(cifs_sb->mountdata);
 761         kfree(cifs_sb);
 762 out_nls:
 763         unload_nls(volume_info->local_nls);
 764         goto out;
 765 }
 766
 767 static ssize_t
 768 cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter)
 769 {
 770         ssize_t rc;
 771         struct inode *inode = file_inode(iocb->ki_filp);
 772
 773         if (iocb->ki_filp->f_flags & O_DIRECT)
 774                 return cifs_user_readv(iocb, iter);
 775
 776         rc = cifs_revalidate_mapping(inode);
 777         if (rc)
 778                 return rc;
 779
 780         return generic_file_read_iter(iocb, iter);
 781 }
 782
 783 static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
 784 {
 785         struct inode *inode = file_inode(iocb->ki_filp);
 786         struct cifsInodeInfo *cinode = CIFS_I(inode);
 787         ssize_t written;
 788         int rc;
 789
 790         if (iocb->ki_filp->f_flags & O_DIRECT) {
 791                 written = cifs_user_writev(iocb, from);
 792                 if (written > 0 && CIFS_CACHE_READ(cinode)) {
 793                         cifs_zap_mapping(inode);
 794                         cifs_dbg(FYI,
 795                                  "Set no oplock for inode=%p after a write operation\n",
 796                                  inode);
 797                         cinode->oplock = 0;
 798                 }
 799                 return written;
 800         }
 801
 802         written = cifs_get_writer(cinode);
 803         if (written)
 804                 return written;
 805
 806         written = generic_file_write_iter(iocb, from);
 807
 808         if (CIFS_CACHE_WRITE(CIFS_I(inode)))
 809                 goto out;
 810
 811         rc = filemap_fdatawrite(inode->i_mapping);
 812         if (rc)
 813                 cifs_dbg(FYI, "cifs_file_write_iter: %d rc on %p inode\n",
 814                          rc, inode);
 815
 816 out:
 817         cifs_put_writer(cinode);
 818         return written;
 819 }
 820
 821 static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
 822 {
 823         /*
 824          * whence == SEEK_END || SEEK_DATA || SEEK_HOLE => we must revalidate
 825          * the cached file length
 826          */
 827         if (whence != SEEK_SET && whence != SEEK_CUR) {
 828                 int rc;
 829                 struct inode *inode = file_inode(file);
 830
 831                 /*
 832                  * We need to be sure that all dirty pages are written and the
 833                  * server has the newest file length.
 834                  */
 835                 if (!CIFS_CACHE_READ(CIFS_I(inode)) && inode->i_mapping &&
 836                     inode->i_mapping->nrpages != 0) {
 837                         rc = filemap_fdatawait(inode->i_mapping);
 838                         if (rc) {
 839                                 mapping_set_error(inode->i_mapping, rc);
 840                                 return rc;
 841                         }
 842                 }
 843                 /*
 844                  * Some applications poll for the file length in this strange
 845                  * way so we must seek to end on non-oplocked files by
 846                  * setting the revalidate time to zero.
 847                  */
 848                 CIFS_I(inode)->time = 0;
 849
 850                 rc = cifs_revalidate_file_attr(file);
 851                 if (rc < 0)
 852                         return (loff_t)rc;
 853         }
 854         return generic_file_llseek(file, offset, whence);
 855 }
 856
 857 static int
 858 cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
 859 {
 860         /*
 861          * Note that this is called by vfs setlease with i_lock held to
 862          * protect *lease from going away.
 863          */
 864         struct inode *inode = file_inode(file);
 865         struct cifsFileInfo *cfile = file->private_data;
 866
 867         if (!(S_ISREG(inode->i_mode)))
 868                 return -EINVAL;
 869
 870         /* Check if file is oplocked if this is request for new lease */
 871         if (arg == F_UNLCK ||
 872             ((arg == F_RDLCK) && CIFS_CACHE_READ(CIFS_I(inode))) ||
 873             ((arg == F_WRLCK) && CIFS_CACHE_WRITE(CIFS_I(inode))))
 874                 return generic_setlease(file, arg, lease, priv);
 875         else if (tlink_tcon(cfile->tlink)->local_lease &&
 876                  !CIFS_CACHE_READ(CIFS_I(inode)))
 877                 /*
 878                  * If the server claims to support oplock on this file, then we
 879                  * still need to check oplock even if the local_lease mount
 880                  * option is set, but there are servers which do not support
 881                  * oplock for which this mount option may be useful if the user
 882                  * knows that the file won't be changed on the server by anyone
 883                  * else.
 884                  */
 885                 return generic_setlease(file, arg, lease, priv);
 886         else
 887                 return -EAGAIN;
 888 }
 889
 890 struct file_system_type cifs_fs_type = {
 891         .owner = THIS_MODULE,
 892         .name = "cifs",
 893         .mount = cifs_do_mount,
 894         .kill_sb = cifs_kill_sb,
 895         /*  .fs_flags */
 896 };
 897 MODULE_ALIAS_FS("cifs");
 898 const struct inode_operations cifs_dir_inode_ops = {
 899         .create = cifs_create,
 900         .atomic_open = cifs_atomic_open,
 901         .lookup = cifs_lookup,
 902         .getattr = cifs_getattr,
 903         .unlink = cifs_unlink,
 904         .link = cifs_hardlink,
 905         .mkdir = cifs_mkdir,
 906         .rmdir = cifs_rmdir,
 907         .rename = cifs_rename2,
 908         .permission = cifs_permission,
 909         .setattr = cifs_setattr,
 910         .symlink = cifs_symlink,
 911         .mknod   = cifs_mknod,
 912         .listxattr = cifs_listxattr,
 913 };
 914
 915 const struct inode_operations cifs_file_inode_ops = {
 916         .setattr = cifs_setattr,
 917         .getattr = cifs_getattr,
 918         .permission = cifs_permission,
 919         .listxattr = cifs_listxattr,
 920 };
 921
 922 const struct inode_operations cifs_symlink_inode_ops = {
 923         .get_link = cifs_get_link,
 924         .permission = cifs_permission,
 925         .listxattr = cifs_listxattr,
 926 };
 927
 928 static int cifs_clone_file_range(struct file *src_file, loff_t off,
 929                 struct file *dst_file, loff_t destoff, u64 len)
 930 {
 931         struct inode *src_inode = file_inode(src_file);
 932         struct inode *target_inode = file_inode(dst_file);
 933         struct cifsFileInfo *smb_file_src = src_file->private_data;
 934         struct cifsFileInfo *smb_file_target = dst_file->private_data;
 935         struct cifs_tcon *target_tcon = tlink_tcon(smb_file_target->tlink);
 936         unsigned int xid;
 937         int rc;
 938
 939         cifs_dbg(FYI, "clone range\n");
 940
 941         xid = get_xid();
 942
 943         if (!src_file->private_data || !dst_file->private_data) {
 944                 rc = -EBADF;
 945                 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
 946                 goto out;
 947         }
 948
 949         /*
 950          * Note: cifs case is easier than btrfs since server responsible for
 951          * checks for proper open modes and file type and if it wants
 952          * server could even support copy of range where source = target
 953          */
 954         lock_two_nondirectories(target_inode, src_inode);
 955
 956         if (len == 0)
 957                 len = src_inode->i_size - off;
 958
 959         cifs_dbg(FYI, "about to flush pages\n");
 960         /* should we flush first and last page first */
 961         truncate_inode_pages_range(&target_inode->i_data, destoff,
 962                                    PAGE_ALIGN(destoff + len)-1);
 963
 964         if (target_tcon->ses->server->ops->duplicate_extents)
 965                 rc = target_tcon->ses->server->ops->duplicate_extents(xid,
 966                         smb_file_src, smb_file_target, off, len, destoff);
 967         else
 968                 rc = -EOPNOTSUPP;
 969
 970         /* force revalidate of size and timestamps of target file now
 971            that target is updated on the server */
 972         CIFS_I(target_inode)->time = 0;
 973         /* although unlocking in the reverse order from locking is not
 974            strictly necessary here it is a little cleaner to be consistent */
 975         unlock_two_nondirectories(src_inode, target_inode);
 976 out:
 977         free_xid(xid);
 978         return rc;
 979 }
 980
 981 ssize_t cifs_file_copychunk_range(unsigned int xid,
 982                                 struct file *src_file, loff_t off,
 983                                 struct file *dst_file, loff_t destoff,
 984                                 size_t len, unsigned int flags)
 985 {
 986         struct inode *src_inode = file_inode(src_file);
 987         struct inode *target_inode = file_inode(dst_file);
 988         struct cifsFileInfo *smb_file_src;
 989         struct cifsFileInfo *smb_file_target;
 990         struct cifs_tcon *src_tcon;
 991         struct cifs_tcon *target_tcon;
 992         ssize_t rc;
 993
 994         cifs_dbg(FYI, "copychunk range\n");
 995
 996         if (src_inode == target_inode) {
 997                 rc = -EINVAL;
 998                 goto out;
 999         }
1000
1001         if (!src_file->private_data || !dst_file->private_data) {
1002                 rc = -EBADF;
1003                 cifs_dbg(VFS, "missing cifsFileInfo on copy range src file\n");
1004                 goto out;
1005         }
1006
1007         rc = -EXDEV;
1008         smb_file_target = dst_file->private_data;
1009         smb_file_src = src_file->private_data;
1010         src_tcon = tlink_tcon(smb_file_src->tlink);
1011         target_tcon = tlink_tcon(smb_file_target->tlink);
1012
1013         if (src_tcon->ses != target_tcon->ses) {
1014                 cifs_dbg(VFS, "source and target of copy not on same server\n");
1015                 goto out;
1016         }
1017
1018         /*
1019          * Note: cifs case is easier than btrfs since server responsible for
1020          * checks for proper open modes and file type and if it wants
1021          * server could even support copy of range where source = target
1022          */
1023         lock_two_nondirectories(target_inode, src_inode);
1024
1025         cifs_dbg(FYI, "about to flush pages\n");
1026         /* should we flush first and last page first */
1027         truncate_inode_pages(&target_inode->i_data, 0);
1028
1029         if (target_tcon->ses->server->ops->copychunk_range)
1030                 rc = target_tcon->ses->server->ops->copychunk_range(xid,
1031                         smb_file_src, smb_file_target, off, len, destoff);
1032         else
1033                 rc = -EOPNOTSUPP;
1034
1035         /* force revalidate of size and timestamps of target file now
1036          * that target is updated on the server
1037          */
1038         CIFS_I(target_inode)->time = 0;
1039         /* although unlocking in the reverse order from locking is not
1040          * strictly necessary here it is a little cleaner to be consistent
1041          */
1042         unlock_two_nondirectories(src_inode, target_inode);
1043
1044 out:
1045         return rc;
1046 }
1047
1048 static ssize_t cifs_copy_file_range(struct file *src_file, loff_t off,
1049                                 struct file *dst_file, loff_t destoff,
1050                                 size_t len, unsigned int flags)
1051 {
1052         unsigned int xid = get_xid();
1053         ssize_t rc;
1054
1055         rc = cifs_file_copychunk_range(xid, src_file, off, dst_file, destoff,
1056                                         len, flags);
1057         free_xid(xid);
1058         return rc;
1059 }
1060
1061 const struct file_operations cifs_file_ops = {
1062         .read_iter = cifs_loose_read_iter,
1063         .write_iter = cifs_file_write_iter,
1064         .open = cifs_open,
1065         .release = cifs_close,
1066         .lock = cifs_lock,
1067         .fsync = cifs_fsync,
1068         .flush = cifs_flush,
1069         .mmap  = cifs_file_mmap,
1070         .splice_read = generic_file_splice_read,
1071         .llseek = cifs_llseek,
1072         .unlocked_ioctl = cifs_ioctl,
1073         .copy_file_range = cifs_copy_file_range,
1074         .clone_file_range = cifs_clone_file_range,
1075         .setlease = cifs_setlease,
1076         .fallocate = cifs_fallocate,
1077 };
1078
1079 const struct file_operations cifs_file_strict_ops = {
1080         .read_iter = cifs_strict_readv,
1081         .write_iter = cifs_strict_writev,
1082         .open = cifs_open,
1083         .release = cifs_close,
1084         .lock = cifs_lock,
1085         .fsync = cifs_strict_fsync,
1086         .flush = cifs_flush,
1087         .mmap = cifs_file_strict_mmap,
1088         .splice_read = generic_file_splice_read,
1089         .llseek = cifs_llseek,
1090         .unlocked_ioctl = cifs_ioctl,
1091         .copy_file_range = cifs_copy_file_range,
1092         .clone_file_range = cifs_clone_file_range,
1093         .setlease = cifs_setlease,
1094         .fallocate = cifs_fallocate,
1095 };
1096
1097 const struct file_operations cifs_file_direct_ops = {
1098         /* BB reevaluate whether they can be done with directio, no cache */
1099         .read_iter = cifs_user_readv,
1100         .write_iter = cifs_user_writev,
1101         .open = cifs_open,
1102         .release = cifs_close,
1103         .lock = cifs_lock,
1104         .fsync = cifs_fsync,
1105         .flush = cifs_flush,
1106         .mmap = cifs_file_mmap,
1107         .splice_read = generic_file_splice_read,
1108         .unlocked_ioctl  = cifs_ioctl,
1109         .copy_file_range = cifs_copy_file_range,
1110         .clone_file_range = cifs_clone_file_range,
1111         .llseek = cifs_llseek,
1112         .setlease = cifs_setlease,
1113         .fallocate = cifs_fallocate,
1114 };
1115
1116 const struct file_operations cifs_file_nobrl_ops = {
1117         .read_iter = cifs_loose_read_iter,
1118         .write_iter = cifs_file_write_iter,
1119         .open = cifs_open,
1120         .release = cifs_close,
1121         .fsync = cifs_fsync,
1122         .flush = cifs_flush,
1123         .mmap  = cifs_file_mmap,
1124         .splice_read = generic_file_splice_read,
1125         .llseek = cifs_llseek,
1126         .unlocked_ioctl = cifs_ioctl,
1127         .copy_file_range = cifs_copy_file_range,
1128         .clone_file_range = cifs_clone_file_range,
1129         .setlease = cifs_setlease,
1130         .fallocate = cifs_fallocate,
1131 };
1132
1133 const struct file_operations cifs_file_strict_nobrl_ops = {
1134         .read_iter = cifs_strict_readv,
1135         .write_iter = cifs_strict_writev,
1136         .open = cifs_open,
1137         .release = cifs_close,
1138         .fsync = cifs_strict_fsync,
1139         .flush = cifs_flush,
1140         .mmap = cifs_file_strict_mmap,
1141         .splice_read = generic_file_splice_read,
1142         .llseek = cifs_llseek,
1143         .unlocked_ioctl = cifs_ioctl,
1144         .copy_file_range = cifs_copy_file_range,
1145         .clone_file_range = cifs_clone_file_range,
1146         .setlease = cifs_setlease,
1147         .fallocate = cifs_fallocate,
1148 };
1149
1150 const struct file_operations cifs_file_direct_nobrl_ops = {
1151         /* BB reevaluate whether they can be done with directio, no cache */
1152         .read_iter = cifs_user_readv,
1153         .write_iter = cifs_user_writev,
1154         .open = cifs_open,
1155         .release = cifs_close,
1156         .fsync = cifs_fsync,
1157         .flush = cifs_flush,
1158         .mmap = cifs_file_mmap,
1159         .splice_read = generic_file_splice_read,
1160         .unlocked_ioctl  = cifs_ioctl,
1161         .copy_file_range = cifs_copy_file_range,
1162         .clone_file_range = cifs_clone_file_range,
1163         .llseek = cifs_llseek,
1164         .setlease = cifs_setlease,
1165         .fallocate = cifs_fallocate,
1166 };
1167
1168 const struct file_operations cifs_dir_ops = {
1169         .iterate_shared = cifs_readdir,
1170         .release = cifs_closedir,
1171         .read    = generic_read_dir,
1172         .unlocked_ioctl  = cifs_ioctl,
1173         .copy_file_range = cifs_copy_file_range,
1174         .clone_file_range = cifs_clone_file_range,
1175         .llseek = generic_file_llseek,
1176 };
1177
1178 static void
1179 cifs_init_once(void *inode)
1180 {
1181         struct cifsInodeInfo *cifsi = inode;
1182
1183         inode_init_once(&cifsi->vfs_inode);
1184         init_rwsem(&cifsi->lock_sem);
1185 }
1186
1187 static int __init
1188 cifs_init_inodecache(void)
1189 {
1190         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
1191                                               sizeof(struct cifsInodeInfo),
1192                                               0, (SLAB_RECLAIM_ACCOUNT|
1193                                                 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1194                                               cifs_init_once);
1195         if (cifs_inode_cachep == NULL)
1196                 return -ENOMEM;
1197
1198         return 0;
1199 }
1200
1201 static void
1202 cifs_destroy_inodecache(void)
1203 {
1204         /*
1205          * Make sure all delayed rcu free inodes are flushed before we
1206          * destroy cache.
1207          */
1208         rcu_barrier();
1209         kmem_cache_destroy(cifs_inode_cachep);
1210 }
1211
1212 static int
1213 cifs_init_request_bufs(void)
1214 {
1215         /*
1216          * SMB2 maximum header size is bigger than CIFS one - no problems to
1217          * allocate some more bytes for CIFS.
1218          */
1219         size_t max_hdr_size = MAX_SMB2_HDR_SIZE;
1220
1221         if (CIFSMaxBufSize < 8192) {
1222         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
1223         Unicode path name has to fit in any SMB/CIFS path based frames */
1224                 CIFSMaxBufSize = 8192;
1225         } else if (CIFSMaxBufSize > 1024*127) {
1226                 CIFSMaxBufSize = 1024 * 127;
1227         } else {
1228                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
1229         }
1230 /*
1231         cifs_dbg(VFS, "CIFSMaxBufSize %d 0x%x\n",
1232                  CIFSMaxBufSize, CIFSMaxBufSize);
1233 */
1234         cifs_req_cachep = kmem_cache_create("cifs_request",
1235                                             CIFSMaxBufSize + max_hdr_size, 0,
1236                                             SLAB_HWCACHE_ALIGN, NULL);
1237         if (cifs_req_cachep == NULL)
1238                 return -ENOMEM;
1239
1240         if (cifs_min_rcv < 1)
1241                 cifs_min_rcv = 1;
1242         else if (cifs_min_rcv > 64) {
1243                 cifs_min_rcv = 64;
1244                 cifs_dbg(VFS, "cifs_min_rcv set to maximum (64)\n");
1245         }
1246
1247         cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
1248                                                   cifs_req_cachep);
1249
1250         if (cifs_req_poolp == NULL) {
1251                 kmem_cache_destroy(cifs_req_cachep);
1252                 return -ENOMEM;
1253         }
1254         /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
1255         almost all handle based requests (but not write response, nor is it
1256         sufficient for path based requests).  A smaller size would have
1257         been more efficient (compacting multiple slab items on one 4k page)
1258         for the case in which debug was on, but this larger size allows
1259         more SMBs to use small buffer alloc and is still much more
1260         efficient to alloc 1 per page off the slab compared to 17K (5page)
1261         alloc of large cifs buffers even when page debugging is on */
1262         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
1263                         MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
1264                         NULL);
1265         if (cifs_sm_req_cachep == NULL) {
1266                 mempool_destroy(cifs_req_poolp);
1267                 kmem_cache_destroy(cifs_req_cachep);
1268                 return -ENOMEM;
1269         }
1270
1271         if (cifs_min_small < 2)
1272                 cifs_min_small = 2;
1273         else if (cifs_min_small > 256) {
1274                 cifs_min_small = 256;
1275                 cifs_dbg(FYI, "cifs_min_small set to maximum (256)\n");
1276         }
1277
1278         cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
1279                                                      cifs_sm_req_cachep);
1280
1281         if (cifs_sm_req_poolp == NULL) {
1282                 mempool_destroy(cifs_req_poolp);
1283                 kmem_cache_destroy(cifs_req_cachep);
1284                 kmem_cache_destroy(cifs_sm_req_cachep);
1285                 return -ENOMEM;
1286         }
1287
1288         return 0;
1289 }
1290
1291 static void
1292 cifs_destroy_request_bufs(void)
1293 {
1294         mempool_destroy(cifs_req_poolp);
1295         kmem_cache_destroy(cifs_req_cachep);
1296         mempool_destroy(cifs_sm_req_poolp);
1297         kmem_cache_destroy(cifs_sm_req_cachep);
1298 }
1299
1300 static int
1301 cifs_init_mids(void)
1302 {
1303         cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
1304                                             sizeof(struct mid_q_entry), 0,
1305                                             SLAB_HWCACHE_ALIGN, NULL);
1306         if (cifs_mid_cachep == NULL)
1307                 return -ENOMEM;
1308
1309         /* 3 is a reasonable minimum number of simultaneous operations */
1310         cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
1311         if (cifs_mid_poolp == NULL) {
1312                 kmem_cache_destroy(cifs_mid_cachep);
1313                 return -ENOMEM;
1314         }
1315
1316         return 0;
1317 }
1318
1319 static void
1320 cifs_destroy_mids(void)
1321 {
1322         mempool_destroy(cifs_mid_poolp);
1323         kmem_cache_destroy(cifs_mid_cachep);
1324 }
1325
1326 static int __init
1327 init_cifs(void)
1328 {
1329         int rc = 0;
1330         cifs_proc_init();
1331         INIT_LIST_HEAD(&cifs_tcp_ses_list);
1332 #ifdef CONFIG_CIFS_DNOTIFY_EXPERIMENTAL /* unused temporarily */
1333         INIT_LIST_HEAD(&GlobalDnotifyReqList);
1334         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1335 #endif /* was needed for dnotify, and will be needed for inotify when VFS fix */
1336 /*
1337  *  Initialize Global counters
1338  */
1339         atomic_set(&sesInfoAllocCount, 0);
1340         atomic_set(&tconInfoAllocCount, 0);
1341         atomic_set(&tcpSesAllocCount, 0);
1342         atomic_set(&tcpSesReconnectCount, 0);
1343         atomic_set(&tconInfoReconnectCount, 0);
1344
1345         atomic_set(&bufAllocCount, 0);
1346         atomic_set(&smBufAllocCount, 0);
1347 #ifdef CONFIG_CIFS_STATS2
1348         atomic_set(&totBufAllocCount, 0);
1349         atomic_set(&totSmBufAllocCount, 0);
1350 #endif /* CONFIG_CIFS_STATS2 */
1351
1352         atomic_set(&midCount, 0);
1353         GlobalCurrentXid = 0;
1354         GlobalTotalActiveXid = 0;
1355         GlobalMaxActiveXid = 0;
1356         spin_lock_init(&cifs_tcp_ses_lock);
1357         spin_lock_init(&GlobalMid_Lock);
1358
1359         cifs_lock_secret = get_random_u32();
1360
1361         if (cifs_max_pending < 2) {
1362                 cifs_max_pending = 2;
1363                 cifs_dbg(FYI, "cifs_max_pending set to min of 2\n");
1364         } else if (cifs_max_pending > CIFS_MAX_REQ) {
1365                 cifs_max_pending = CIFS_MAX_REQ;
1366                 cifs_dbg(FYI, "cifs_max_pending set to max of %u\n",
1367                          CIFS_MAX_REQ);
1368         }
1369
1370         cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1371         if (!cifsiod_wq) {
1372                 rc = -ENOMEM;
1373                 goto out_clean_proc;
1374         }
1375
1376         cifsoplockd_wq = alloc_workqueue("cifsoplockd",
1377                                          WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
1378         if (!cifsoplockd_wq) {
1379                 rc = -ENOMEM;
1380                 goto out_destroy_cifsiod_wq;
1381         }
1382
1383         rc = cifs_fscache_register();
1384         if (rc)
1385                 goto out_destroy_cifsoplockd_wq;
1386
1387         rc = cifs_init_inodecache();
1388         if (rc)
1389                 goto out_unreg_fscache;
1390
1391         rc = cifs_init_mids();
1392         if (rc)
1393                 goto out_destroy_inodecache;
1394
1395         rc = cifs_init_request_bufs();
1396         if (rc)
1397                 goto out_destroy_mids;
1398
1399 #ifdef CONFIG_CIFS_UPCALL
1400         rc = init_cifs_spnego();
1401         if (rc)
1402                 goto out_destroy_request_bufs;
1403 #endif /* CONFIG_CIFS_UPCALL */
1404
1405 #ifdef CONFIG_CIFS_ACL
1406         rc = init_cifs_idmap();
1407         if (rc)
1408                 goto out_register_key_type;
1409 #endif /* CONFIG_CIFS_ACL */
1410
1411         rc = register_filesystem(&cifs_fs_type);
1412         if (rc)
1413                 goto out_init_cifs_idmap;
1414
1415         return 0;
1416
1417 out_init_cifs_idmap:
1418 #ifdef CONFIG_CIFS_ACL
1419         exit_cifs_idmap();
1420 out_register_key_type:
1421 #endif
1422 #ifdef CONFIG_CIFS_UPCALL
1423         exit_cifs_spnego();
1424 out_destroy_request_bufs:
1425 #endif
1426         cifs_destroy_request_bufs();
1427 out_destroy_mids:
1428         cifs_destroy_mids();
1429 out_destroy_inodecache:
1430         cifs_destroy_inodecache();
1431 out_unreg_fscache:
1432         cifs_fscache_unregister();
1433 out_destroy_cifsoplockd_wq:
1434         destroy_workqueue(cifsoplockd_wq);
1435 out_destroy_cifsiod_wq:
1436         destroy_workqueue(cifsiod_wq);
1437 out_clean_proc:
1438         cifs_proc_clean();
1439         return rc;
1440 }
1441
1442 static void __exit
1443 exit_cifs(void)
1444 {
1445         cifs_dbg(NOISY, "exit_cifs\n");
1446         unregister_filesystem(&cifs_fs_type);
1447         cifs_dfs_release_automount_timer();
1448 #ifdef CONFIG_CIFS_ACL
1449         exit_cifs_idmap();
1450 #endif
1451 #ifdef CONFIG_CIFS_UPCALL
1452         exit_cifs_spnego();
1453 #endif
1454         cifs_destroy_request_bufs();
1455         cifs_destroy_mids();
1456         cifs_destroy_inodecache();
1457         cifs_fscache_unregister();
1458         destroy_workqueue(cifsoplockd_wq);
1459         destroy_workqueue(cifsiod_wq);
1460         cifs_proc_clean();
1461 }
1462
1463 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1464 MODULE_LICENSE("GPL");  /* combination of LGPL + GPL source behaves as GPL */
1465 MODULE_DESCRIPTION
1466     ("VFS to access servers complying with the SNIA CIFS Specification "
1467      "e.g. Samba and Windows");
1468 MODULE_VERSION(CIFS_VERSION);
1469 MODULE_SOFTDEP("pre: arc4");
1470 MODULE_SOFTDEP("pre: des");
1471 MODULE_SOFTDEP("pre: ecb");
1472 MODULE_SOFTDEP("pre: hmac");
1473 MODULE_SOFTDEP("pre: md4");
1474 MODULE_SOFTDEP("pre: md5");
1475 MODULE_SOFTDEP("pre: nls");
1476 MODULE_SOFTDEP("pre: aes");
1477 MODULE_SOFTDEP("pre: cmac");
1478 MODULE_SOFTDEP("pre: sha256");
1479 MODULE_SOFTDEP("pre: aead2");
1480 MODULE_SOFTDEP("pre: ccm");
1481 module_init(init_cifs)
1482 module_exit(exit_cifs)