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 <net/ipv6.h>
  39 #include "cifsfs.h"
  40 #include "cifspdu.h"
  41 #define DECLARE_GLOBALS_HERE
  42 #include "cifsglob.h"
  43 #include "cifsproto.h"
  44 #include "cifs_debug.h"
  45 #include "cifs_fs_sb.h"
  46 #include <linux/mm.h>
  47 #include <linux/key-type.h>
  48 #include "cifs_spnego.h"
  49 #include "fscache.h"
  50 #define CIFS_MAGIC_NUMBER 0xFF534D42    /* the first four bytes of SMB PDUs */
  51
  52 int cifsFYI = 0;
  53 int cifsERROR = 1;
  54 int traceSMB = 0;
  55 unsigned int oplockEnabled = 1;
  56 unsigned int experimEnabled = 0;
  57 unsigned int linuxExtEnabled = 1;
  58 unsigned int lookupCacheEnabled = 1;
  59 unsigned int multiuser_mount = 0;
  60 unsigned int global_secflags = CIFSSEC_DEF;
  61 /* unsigned int ntlmv2_support = 0; */
  62 unsigned int sign_CIFS_PDUs = 1;
  63 static const struct super_operations cifs_super_ops;
  64 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
  65 module_param(CIFSMaxBufSize, int, 0);
  66 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header). "
  67                                  "Default: 16384 Range: 8192 to 130048");
  68 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
  69 module_param(cifs_min_rcv, int, 0);
  70 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
  71                                 "1 to 64");
  72 unsigned int cifs_min_small = 30;
  73 module_param(cifs_min_small, int, 0);
  74 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
  75                                  "Range: 2 to 256");
  76 unsigned int cifs_max_pending = CIFS_MAX_REQ;
  77 module_param(cifs_max_pending, int, 0);
  78 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. "
  79                                    "Default: 50 Range: 2 to 256");
  80 unsigned short echo_retries = 5;
  81 module_param(echo_retries, ushort, 0644);
  82 MODULE_PARM_DESC(echo_retries, "Number of echo attempts before giving up and "
  83                                "reconnecting server. Default: 5. 0 means "
  84                                "never reconnect.");
  85 extern mempool_t *cifs_sm_req_poolp;
  86 extern mempool_t *cifs_req_poolp;
  87 extern mempool_t *cifs_mid_poolp;
  88
  89 void
  90 cifs_sb_active(struct super_block *sb)
  91 {
  92         struct cifs_sb_info *server = CIFS_SB(sb);
  93
  94         if (atomic_inc_return(&server->active) == 1)
  95                 atomic_inc(&sb->s_active);
  96 }
  97
  98 void
  99 cifs_sb_deactive(struct super_block *sb)
 100 {
 101         struct cifs_sb_info *server = CIFS_SB(sb);
 102
 103         if (atomic_dec_and_test(&server->active))
 104                 deactivate_super(sb);
 105 }
 106
 107 static int
 108 cifs_read_super(struct super_block *sb, void *data,
 109                 const char *devname, int silent)
 110 {
 111         struct inode *inode;
 112         struct cifs_sb_info *cifs_sb;
 113         int rc = 0;
 114
 115         /* BB should we make this contingent on mount parm? */
 116         sb->s_flags |= MS_NODIRATIME | MS_NOATIME;
 117         sb->s_fs_info = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
 118         cifs_sb = CIFS_SB(sb);
 119         if (cifs_sb == NULL)
 120                 return -ENOMEM;
 121
 122         spin_lock_init(&cifs_sb->tlink_tree_lock);
 123         cifs_sb->tlink_tree = RB_ROOT;
 124
 125         rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs", BDI_CAP_MAP_COPY);
 126         if (rc) {
 127                 kfree(cifs_sb);
 128                 return rc;
 129         }
 130         cifs_sb->bdi.ra_pages = default_backing_dev_info.ra_pages;
 131
 132 #ifdef CONFIG_CIFS_DFS_UPCALL
 133         /* copy mount params to sb for use in submounts */
 134         /* BB: should we move this after the mount so we
 135          * do not have to do the copy on failed mounts?
 136          * BB: May be it is better to do simple copy before
 137          * complex operation (mount), and in case of fail
 138          * just exit instead of doing mount and attempting
 139          * undo it if this copy fails?*/
 140         if (data) {
 141                 int len = strlen(data);
 142                 cifs_sb->mountdata = kzalloc(len + 1, GFP_KERNEL);
 143                 if (cifs_sb->mountdata == NULL) {
 144                         bdi_destroy(&cifs_sb->bdi);
 145                         kfree(sb->s_fs_info);
 146                         sb->s_fs_info = NULL;
 147                         return -ENOMEM;
 148                 }
 149                 strncpy(cifs_sb->mountdata, data, len + 1);
 150                 cifs_sb->mountdata[len] = '\0';
 151         }
 152 #endif
 153
 154         rc = cifs_mount(sb, cifs_sb, data, devname);
 155
 156         if (rc) {
 157                 if (!silent)
 158                         cERROR(1, "cifs_mount failed w/return code = %d", rc);
 159                 goto out_mount_failed;
 160         }
 161
 162         sb->s_magic = CIFS_MAGIC_NUMBER;
 163         sb->s_op = &cifs_super_ops;
 164         sb->s_bdi = &cifs_sb->bdi;
 165         sb->s_blocksize = CIFS_MAX_MSGSIZE;
 166         sb->s_blocksize_bits = 14;      /* default 2**14 = CIFS_MAX_MSGSIZE */
 167         inode = cifs_root_iget(sb, ROOT_I);
 168
 169         if (IS_ERR(inode)) {
 170                 rc = PTR_ERR(inode);
 171                 inode = NULL;
 172                 goto out_no_root;
 173         }
 174
 175         sb->s_root = d_alloc_root(inode);
 176
 177         if (!sb->s_root) {
 178                 rc = -ENOMEM;
 179                 goto out_no_root;
 180         }
 181
 182         /* do that *after* d_alloc_root() - we want NULL ->d_op for root here */
 183         if (cifs_sb_master_tcon(cifs_sb)->nocase)
 184                 sb->s_d_op = &cifs_ci_dentry_ops;
 185         else
 186                 sb->s_d_op = &cifs_dentry_ops;
 187
 188 #ifdef CONFIG_CIFS_EXPERIMENTAL
 189         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 190                 cFYI(1, "export ops supported");
 191                 sb->s_export_op = &cifs_export_ops;
 192         }
 193 #endif /* EXPERIMENTAL */
 194
 195         return 0;
 196
 197 out_no_root:
 198         cERROR(1, "cifs_read_super: get root inode failed");
 199         if (inode)
 200                 iput(inode);
 201
 202         cifs_umount(sb, cifs_sb);
 203
 204 out_mount_failed:
 205         if (cifs_sb) {
 206 #ifdef CONFIG_CIFS_DFS_UPCALL
 207                 if (cifs_sb->mountdata) {
 208                         kfree(cifs_sb->mountdata);
 209                         cifs_sb->mountdata = NULL;
 210                 }
 211 #endif
 212                 unload_nls(cifs_sb->local_nls);
 213                 bdi_destroy(&cifs_sb->bdi);
 214                 kfree(cifs_sb);
 215         }
 216         return rc;
 217 }
 218
 219 static void
 220 cifs_put_super(struct super_block *sb)
 221 {
 222         int rc = 0;
 223         struct cifs_sb_info *cifs_sb;
 224
 225         cFYI(1, "In cifs_put_super");
 226         cifs_sb = CIFS_SB(sb);
 227         if (cifs_sb == NULL) {
 228                 cFYI(1, "Empty cifs superblock info passed to unmount");
 229                 return;
 230         }
 231
 232         rc = cifs_umount(sb, cifs_sb);
 233         if (rc)
 234                 cERROR(1, "cifs_umount failed with return code %d", rc);
 235 #ifdef CONFIG_CIFS_DFS_UPCALL
 236         if (cifs_sb->mountdata) {
 237                 kfree(cifs_sb->mountdata);
 238                 cifs_sb->mountdata = NULL;
 239         }
 240 #endif
 241
 242         unload_nls(cifs_sb->local_nls);
 243         bdi_destroy(&cifs_sb->bdi);
 244         kfree(cifs_sb);
 245 }
 246
 247 static int
 248 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
 249 {
 250         struct super_block *sb = dentry->d_sb;
 251         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 252         struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb);
 253         int rc = -EOPNOTSUPP;
 254         int xid;
 255
 256         xid = GetXid();
 257
 258         buf->f_type = CIFS_MAGIC_NUMBER;
 259
 260         /*
 261          * PATH_MAX may be too long - it would presumably be total path,
 262          * but note that some servers (includinng Samba 3) have a shorter
 263          * maximum path.
 264          *
 265          * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
 266          */
 267         buf->f_namelen = PATH_MAX;
 268         buf->f_files = 0;       /* undefined */
 269         buf->f_ffree = 0;       /* unlimited */
 270
 271         /*
 272          * We could add a second check for a QFS Unix capability bit
 273          */
 274         if ((tcon->ses->capabilities & CAP_UNIX) &&
 275             (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability)))
 276                 rc = CIFSSMBQFSPosixInfo(xid, tcon, buf);
 277
 278         /*
 279          * Only need to call the old QFSInfo if failed on newer one,
 280          * e.g. by OS/2.
 281          **/
 282         if (rc && (tcon->ses->capabilities & CAP_NT_SMBS))
 283                 rc = CIFSSMBQFSInfo(xid, tcon, buf);
 284
 285         /*
 286          * Some old Windows servers also do not support level 103, retry with
 287          * older level one if old server failed the previous call or we
 288          * bypassed it because we detected that this was an older LANMAN sess
 289          */
 290         if (rc)
 291                 rc = SMBOldQFSInfo(xid, tcon, buf);
 292
 293         FreeXid(xid);
 294         return 0;
 295 }
 296
 297 static int cifs_permission(struct inode *inode, int mask, unsigned int flags)
 298 {
 299         struct cifs_sb_info *cifs_sb;
 300
 301         if (flags & IPERM_FLAG_RCU)
 302                 return -ECHILD;
 303
 304         cifs_sb = CIFS_SB(inode->i_sb);
 305
 306         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
 307                 if ((mask & MAY_EXEC) && !execute_ok(inode))
 308                         return -EACCES;
 309                 else
 310                         return 0;
 311         } else /* file mode might have been restricted at mount time
 312                 on the client (above and beyond ACL on servers) for
 313                 servers which do not support setting and viewing mode bits,
 314                 so allowing client to check permissions is useful */
 315                 return generic_permission(inode, mask, flags, NULL);
 316 }
 317
 318 static struct kmem_cache *cifs_inode_cachep;
 319 static struct kmem_cache *cifs_req_cachep;
 320 static struct kmem_cache *cifs_mid_cachep;
 321 static struct kmem_cache *cifs_sm_req_cachep;
 322 mempool_t *cifs_sm_req_poolp;
 323 mempool_t *cifs_req_poolp;
 324 mempool_t *cifs_mid_poolp;
 325
 326 static struct inode *
 327 cifs_alloc_inode(struct super_block *sb)
 328 {
 329         struct cifsInodeInfo *cifs_inode;
 330         cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
 331         if (!cifs_inode)
 332                 return NULL;
 333         cifs_inode->cifsAttrs = 0x20;   /* default */
 334         cifs_inode->time = 0;
 335         /* Until the file is open and we have gotten oplock
 336         info back from the server, can not assume caching of
 337         file data or metadata */
 338         cifs_set_oplock_level(cifs_inode, 0);
 339         cifs_inode->delete_pending = false;
 340         cifs_inode->invalid_mapping = false;
 341         cifs_inode->vfs_inode.i_blkbits = 14;  /* 2**14 = CIFS_MAX_MSGSIZE */
 342         cifs_inode->server_eof = 0;
 343         cifs_inode->uniqueid = 0;
 344         cifs_inode->createtime = 0;
 345
 346         /* Can not set i_flags here - they get immediately overwritten
 347            to zero by the VFS */
 348 /*      cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;*/
 349         INIT_LIST_HEAD(&cifs_inode->openFileList);
 350         return &cifs_inode->vfs_inode;
 351 }
 352
 353 static void cifs_i_callback(struct rcu_head *head)
 354 {
 355         struct inode *inode = container_of(head, struct inode, i_rcu);
 356         INIT_LIST_HEAD(&inode->i_dentry);
 357         kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
 358 }
 359
 360 static void
 361 cifs_destroy_inode(struct inode *inode)
 362 {
 363         call_rcu(&inode->i_rcu, cifs_i_callback);
 364 }
 365
 366 static void
 367 cifs_evict_inode(struct inode *inode)
 368 {
 369         truncate_inode_pages(&inode->i_data, 0);
 370         end_writeback(inode);
 371         cifs_fscache_release_inode_cookie(inode);
 372 }
 373
 374 static void
 375 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
 376 {
 377         struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
 378         struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
 379
 380         seq_printf(s, ",addr=");
 381
 382         switch (server->dstaddr.ss_family) {
 383         case AF_INET:
 384                 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
 385                 break;
 386         case AF_INET6:
 387                 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
 388                 if (sa6->sin6_scope_id)
 389                         seq_printf(s, "%%%u", sa6->sin6_scope_id);
 390                 break;
 391         default:
 392                 seq_printf(s, "(unknown)");
 393         }
 394 }
 395
 396 /*
 397  * cifs_show_options() is for displaying mount options in /proc/mounts.
 398  * Not all settable options are displayed but most of the important
 399  * ones are.
 400  */
 401 static int
 402 cifs_show_options(struct seq_file *s, struct vfsmount *m)
 403 {
 404         struct cifs_sb_info *cifs_sb = CIFS_SB(m->mnt_sb);
 405         struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb);
 406         struct sockaddr *srcaddr;
 407         srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
 408
 409         seq_printf(s, ",unc=%s", tcon->treeName);
 410
 411         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
 412                 seq_printf(s, ",multiuser");
 413         else if (tcon->ses->userName)
 414                 seq_printf(s, ",username=%s", tcon->ses->userName);
 415
 416         if (tcon->ses->domainName)
 417                 seq_printf(s, ",domain=%s", 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=%d", cifs_sb->mnt_uid);
 436         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
 437                 seq_printf(s, ",forceuid");
 438         else
 439                 seq_printf(s, ",noforceuid");
 440
 441         seq_printf(s, ",gid=%d", cifs_sb->mnt_gid);
 442         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
 443                 seq_printf(s, ",forcegid");
 444         else
 445                 seq_printf(s, ",noforcegid");
 446
 447         cifs_show_address(s, tcon->ses->server);
 448
 449         if (!tcon->unix_ext)
 450                 seq_printf(s, ",file_mode=0%o,dir_mode=0%o",
 451                                            cifs_sb->mnt_file_mode,
 452                                            cifs_sb->mnt_dir_mode);
 453         if (tcon->seal)
 454                 seq_printf(s, ",seal");
 455         if (tcon->nocase)
 456                 seq_printf(s, ",nocase");
 457         if (tcon->retry)
 458                 seq_printf(s, ",hard");
 459         if (cifs_sb->prepath)
 460                 seq_printf(s, ",prepath=%s", cifs_sb->prepath);
 461         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 462                 seq_printf(s, ",posixpaths");
 463         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
 464                 seq_printf(s, ",setuids");
 465         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 466                 seq_printf(s, ",serverino");
 467         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
 468                 seq_printf(s, ",directio");
 469         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 470                 seq_printf(s, ",nouser_xattr");
 471         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 472                 seq_printf(s, ",mapchars");
 473         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
 474                 seq_printf(s, ",sfu");
 475         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 476                 seq_printf(s, ",nobrl");
 477         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
 478                 seq_printf(s, ",cifsacl");
 479         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
 480                 seq_printf(s, ",dynperm");
 481         if (m->mnt_sb->s_flags & MS_POSIXACL)
 482                 seq_printf(s, ",acl");
 483         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
 484                 seq_printf(s, ",mfsymlinks");
 485         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
 486                 seq_printf(s, ",fsc");
 487
 488         seq_printf(s, ",rsize=%d", cifs_sb->rsize);
 489         seq_printf(s, ",wsize=%d", cifs_sb->wsize);
 490         /* convert actimeo and display it in seconds */
 491                 seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
 492
 493         return 0;
 494 }
 495
 496 static void cifs_umount_begin(struct super_block *sb)
 497 {
 498         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 499         struct cifsTconInfo *tcon;
 500
 501         if (cifs_sb == NULL)
 502                 return;
 503
 504         tcon = cifs_sb_master_tcon(cifs_sb);
 505
 506         spin_lock(&cifs_tcp_ses_lock);
 507         if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
 508                 /* we have other mounts to same share or we have
 509                    already tried to force umount this and woken up
 510                    all waiting network requests, nothing to do */
 511                 spin_unlock(&cifs_tcp_ses_lock);
 512                 return;
 513         } else if (tcon->tc_count == 1)
 514                 tcon->tidStatus = CifsExiting;
 515         spin_unlock(&cifs_tcp_ses_lock);
 516
 517         /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
 518         /* cancel_notify_requests(tcon); */
 519         if (tcon->ses && tcon->ses->server) {
 520                 cFYI(1, "wake up tasks now - umount begin not complete");
 521                 wake_up_all(&tcon->ses->server->request_q);
 522                 wake_up_all(&tcon->ses->server->response_q);
 523                 msleep(1); /* yield */
 524                 /* we have to kick the requests once more */
 525                 wake_up_all(&tcon->ses->server->response_q);
 526                 msleep(1);
 527         }
 528
 529         return;
 530 }
 531
 532 #ifdef CONFIG_CIFS_STATS2
 533 static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt)
 534 {
 535         /* BB FIXME */
 536         return 0;
 537 }
 538 #endif
 539
 540 static int cifs_remount(struct super_block *sb, int *flags, char *data)
 541 {
 542         *flags |= MS_NODIRATIME;
 543         return 0;
 544 }
 545
 546 static int cifs_drop_inode(struct inode *inode)
 547 {
 548         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 549
 550         /* no serverino => unconditional eviction */
 551         return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
 552                 generic_drop_inode(inode);
 553 }
 554
 555 static const struct super_operations cifs_super_ops = {
 556         .put_super = cifs_put_super,
 557         .statfs = cifs_statfs,
 558         .alloc_inode = cifs_alloc_inode,
 559         .destroy_inode = cifs_destroy_inode,
 560         .drop_inode     = cifs_drop_inode,
 561         .evict_inode    = cifs_evict_inode,
 562 /*      .delete_inode   = cifs_delete_inode,  */  /* Do not need above
 563         function unless later we add lazy close of inodes or unless the
 564         kernel forgets to call us with the same number of releases (closes)
 565         as opens */
 566         .show_options = cifs_show_options,
 567         .umount_begin   = cifs_umount_begin,
 568         .remount_fs = cifs_remount,
 569 #ifdef CONFIG_CIFS_STATS2
 570         .show_stats = cifs_show_stats,
 571 #endif
 572 };
 573
 574 static struct dentry *
 575 cifs_do_mount(struct file_system_type *fs_type,
 576             int flags, const char *dev_name, void *data)
 577 {
 578         int rc;
 579         struct super_block *sb;
 580
 581         sb = sget(fs_type, NULL, set_anon_super, NULL);
 582
 583         cFYI(1, "Devname: %s flags: %d ", dev_name, flags);
 584
 585         if (IS_ERR(sb))
 586                 return ERR_CAST(sb);
 587
 588         sb->s_flags = flags;
 589
 590         rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
 591         if (rc) {
 592                 deactivate_locked_super(sb);
 593                 return ERR_PTR(rc);
 594         }
 595         sb->s_flags |= MS_ACTIVE;
 596         return dget(sb->s_root);
 597 }
 598
 599 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 600                                    unsigned long nr_segs, loff_t pos)
 601 {
 602         struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
 603         ssize_t written;
 604         int rc;
 605
 606         written = generic_file_aio_write(iocb, iov, nr_segs, pos);
 607
 608         if (CIFS_I(inode)->clientCanCacheAll)
 609                 return written;
 610
 611         rc = filemap_fdatawrite(inode->i_mapping);
 612         if (rc)
 613                 cFYI(1, "cifs_file_aio_write: %d rc on %p inode", rc, inode);
 614
 615         return written;
 616 }
 617
 618 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
 619 {
 620         /* origin == SEEK_END => we must revalidate the cached file length */
 621         if (origin == SEEK_END) {
 622                 int retval;
 623
 624                 /* some applications poll for the file length in this strange
 625                    way so we must seek to end on non-oplocked files by
 626                    setting the revalidate time to zero */
 627                 CIFS_I(file->f_path.dentry->d_inode)->time = 0;
 628
 629                 retval = cifs_revalidate_file(file);
 630                 if (retval < 0)
 631                         return (loff_t)retval;
 632         }
 633         return generic_file_llseek_unlocked(file, offset, origin);
 634 }
 635
 636 static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
 637 {
 638         /* note that this is called by vfs setlease with lock_flocks held
 639            to protect *lease from going away */
 640         struct inode *inode = file->f_path.dentry->d_inode;
 641         struct cifsFileInfo *cfile = file->private_data;
 642
 643         if (!(S_ISREG(inode->i_mode)))
 644                 return -EINVAL;
 645
 646         /* check if file is oplocked */
 647         if (((arg == F_RDLCK) &&
 648                 (CIFS_I(inode)->clientCanCacheRead)) ||
 649             ((arg == F_WRLCK) &&
 650                 (CIFS_I(inode)->clientCanCacheAll)))
 651                 return generic_setlease(file, arg, lease);
 652         else if (tlink_tcon(cfile->tlink)->local_lease &&
 653                  !CIFS_I(inode)->clientCanCacheRead)
 654                 /* If the server claims to support oplock on this
 655                    file, then we still need to check oplock even
 656                    if the local_lease mount option is set, but there
 657                    are servers which do not support oplock for which
 658                    this mount option may be useful if the user
 659                    knows that the file won't be changed on the server
 660                    by anyone else */
 661                 return generic_setlease(file, arg, lease);
 662         else
 663                 return -EAGAIN;
 664 }
 665
 666 struct file_system_type cifs_fs_type = {
 667         .owner = THIS_MODULE,
 668         .name = "cifs",
 669         .mount = cifs_do_mount,
 670         .kill_sb = kill_anon_super,
 671         /*  .fs_flags */
 672 };
 673 const struct inode_operations cifs_dir_inode_ops = {
 674         .create = cifs_create,
 675         .lookup = cifs_lookup,
 676         .getattr = cifs_getattr,
 677         .unlink = cifs_unlink,
 678         .link = cifs_hardlink,
 679         .mkdir = cifs_mkdir,
 680         .rmdir = cifs_rmdir,
 681         .rename = cifs_rename,
 682         .permission = cifs_permission,
 683 /*      revalidate:cifs_revalidate,   */
 684         .setattr = cifs_setattr,
 685         .symlink = cifs_symlink,
 686         .mknod   = cifs_mknod,
 687 #ifdef CONFIG_CIFS_XATTR
 688         .setxattr = cifs_setxattr,
 689         .getxattr = cifs_getxattr,
 690         .listxattr = cifs_listxattr,
 691         .removexattr = cifs_removexattr,
 692 #endif
 693 };
 694
 695 const struct inode_operations cifs_file_inode_ops = {
 696 /*      revalidate:cifs_revalidate, */
 697         .setattr = cifs_setattr,
 698         .getattr = cifs_getattr, /* do we need this anymore? */
 699         .rename = cifs_rename,
 700         .permission = cifs_permission,
 701 #ifdef CONFIG_CIFS_XATTR
 702         .setxattr = cifs_setxattr,
 703         .getxattr = cifs_getxattr,
 704         .listxattr = cifs_listxattr,
 705         .removexattr = cifs_removexattr,
 706 #endif
 707 };
 708
 709 const struct inode_operations cifs_symlink_inode_ops = {
 710         .readlink = generic_readlink,
 711         .follow_link = cifs_follow_link,
 712         .put_link = cifs_put_link,
 713         .permission = cifs_permission,
 714         /* BB add the following two eventually */
 715         /* revalidate: cifs_revalidate,
 716            setattr:    cifs_notify_change, *//* BB do we need notify change */
 717 #ifdef CONFIG_CIFS_XATTR
 718         .setxattr = cifs_setxattr,
 719         .getxattr = cifs_getxattr,
 720         .listxattr = cifs_listxattr,
 721         .removexattr = cifs_removexattr,
 722 #endif
 723 };
 724
 725 const struct file_operations cifs_file_ops = {
 726         .read = do_sync_read,
 727         .write = do_sync_write,
 728         .aio_read = generic_file_aio_read,
 729         .aio_write = cifs_file_aio_write,
 730         .open = cifs_open,
 731         .release = cifs_close,
 732         .lock = cifs_lock,
 733         .fsync = cifs_fsync,
 734         .flush = cifs_flush,
 735         .mmap  = cifs_file_mmap,
 736         .splice_read = generic_file_splice_read,
 737         .llseek = cifs_llseek,
 738 #ifdef CONFIG_CIFS_POSIX
 739         .unlocked_ioctl = cifs_ioctl,
 740 #endif /* CONFIG_CIFS_POSIX */
 741         .setlease = cifs_setlease,
 742 };
 743
 744 const struct file_operations cifs_file_strict_ops = {
 745         .read = do_sync_read,
 746         .write = do_sync_write,
 747         .aio_read = cifs_strict_readv,
 748         .aio_write = cifs_strict_writev,
 749         .open = cifs_open,
 750         .release = cifs_close,
 751         .lock = cifs_lock,
 752         .fsync = cifs_strict_fsync,
 753         .flush = cifs_flush,
 754         .mmap = cifs_file_strict_mmap,
 755         .splice_read = generic_file_splice_read,
 756         .llseek = cifs_llseek,
 757 #ifdef CONFIG_CIFS_POSIX
 758         .unlocked_ioctl = cifs_ioctl,
 759 #endif /* CONFIG_CIFS_POSIX */
 760         .setlease = cifs_setlease,
 761 };
 762
 763 const struct file_operations cifs_file_direct_ops = {
 764         /* no aio, no readv -
 765            BB reevaluate whether they can be done with directio, no cache */
 766         .read = cifs_user_read,
 767         .write = cifs_user_write,
 768         .open = cifs_open,
 769         .release = cifs_close,
 770         .lock = cifs_lock,
 771         .fsync = cifs_fsync,
 772         .flush = cifs_flush,
 773         .mmap = cifs_file_mmap,
 774         .splice_read = generic_file_splice_read,
 775 #ifdef CONFIG_CIFS_POSIX
 776         .unlocked_ioctl  = cifs_ioctl,
 777 #endif /* CONFIG_CIFS_POSIX */
 778         .llseek = cifs_llseek,
 779         .setlease = cifs_setlease,
 780 };
 781
 782 const struct file_operations cifs_file_nobrl_ops = {
 783         .read = do_sync_read,
 784         .write = do_sync_write,
 785         .aio_read = generic_file_aio_read,
 786         .aio_write = cifs_file_aio_write,
 787         .open = cifs_open,
 788         .release = cifs_close,
 789         .fsync = cifs_fsync,
 790         .flush = cifs_flush,
 791         .mmap  = cifs_file_mmap,
 792         .splice_read = generic_file_splice_read,
 793         .llseek = cifs_llseek,
 794 #ifdef CONFIG_CIFS_POSIX
 795         .unlocked_ioctl = cifs_ioctl,
 796 #endif /* CONFIG_CIFS_POSIX */
 797         .setlease = cifs_setlease,
 798 };
 799
 800 const struct file_operations cifs_file_strict_nobrl_ops = {
 801         .read = do_sync_read,
 802         .write = do_sync_write,
 803         .aio_read = cifs_strict_readv,
 804         .aio_write = cifs_strict_writev,
 805         .open = cifs_open,
 806         .release = cifs_close,
 807         .fsync = cifs_strict_fsync,
 808         .flush = cifs_flush,
 809         .mmap = cifs_file_strict_mmap,
 810         .splice_read = generic_file_splice_read,
 811         .llseek = cifs_llseek,
 812 #ifdef CONFIG_CIFS_POSIX
 813         .unlocked_ioctl = cifs_ioctl,
 814 #endif /* CONFIG_CIFS_POSIX */
 815         .setlease = cifs_setlease,
 816 };
 817
 818 const struct file_operations cifs_file_direct_nobrl_ops = {
 819         /* no mmap, no aio, no readv -
 820            BB reevaluate whether they can be done with directio, no cache */
 821         .read = cifs_user_read,
 822         .write = cifs_user_write,
 823         .open = cifs_open,
 824         .release = cifs_close,
 825         .fsync = cifs_fsync,
 826         .flush = cifs_flush,
 827         .mmap = cifs_file_mmap,
 828         .splice_read = generic_file_splice_read,
 829 #ifdef CONFIG_CIFS_POSIX
 830         .unlocked_ioctl  = cifs_ioctl,
 831 #endif /* CONFIG_CIFS_POSIX */
 832         .llseek = cifs_llseek,
 833         .setlease = cifs_setlease,
 834 };
 835
 836 const struct file_operations cifs_dir_ops = {
 837         .readdir = cifs_readdir,
 838         .release = cifs_closedir,
 839         .read    = generic_read_dir,
 840         .unlocked_ioctl  = cifs_ioctl,
 841         .llseek = generic_file_llseek,
 842 };
 843
 844 static void
 845 cifs_init_once(void *inode)
 846 {
 847         struct cifsInodeInfo *cifsi = inode;
 848
 849         inode_init_once(&cifsi->vfs_inode);
 850         INIT_LIST_HEAD(&cifsi->lockList);
 851 }
 852
 853 static int
 854 cifs_init_inodecache(void)
 855 {
 856         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
 857                                               sizeof(struct cifsInodeInfo),
 858                                               0, (SLAB_RECLAIM_ACCOUNT|
 859                                                 SLAB_MEM_SPREAD),
 860                                               cifs_init_once);
 861         if (cifs_inode_cachep == NULL)
 862                 return -ENOMEM;
 863
 864         return 0;
 865 }
 866
 867 static void
 868 cifs_destroy_inodecache(void)
 869 {
 870         kmem_cache_destroy(cifs_inode_cachep);
 871 }
 872
 873 static int
 874 cifs_init_request_bufs(void)
 875 {
 876         if (CIFSMaxBufSize < 8192) {
 877         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
 878         Unicode path name has to fit in any SMB/CIFS path based frames */
 879                 CIFSMaxBufSize = 8192;
 880         } else if (CIFSMaxBufSize > 1024*127) {
 881                 CIFSMaxBufSize = 1024 * 127;
 882         } else {
 883                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
 884         }
 885 /*      cERROR(1, "CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize); */
 886         cifs_req_cachep = kmem_cache_create("cifs_request",
 887                                             CIFSMaxBufSize +
 888                                             MAX_CIFS_HDR_SIZE, 0,
 889                                             SLAB_HWCACHE_ALIGN, NULL);
 890         if (cifs_req_cachep == NULL)
 891                 return -ENOMEM;
 892
 893         if (cifs_min_rcv < 1)
 894                 cifs_min_rcv = 1;
 895         else if (cifs_min_rcv > 64) {
 896                 cifs_min_rcv = 64;
 897                 cERROR(1, "cifs_min_rcv set to maximum (64)");
 898         }
 899
 900         cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
 901                                                   cifs_req_cachep);
 902
 903         if (cifs_req_poolp == NULL) {
 904                 kmem_cache_destroy(cifs_req_cachep);
 905                 return -ENOMEM;
 906         }
 907         /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
 908         almost all handle based requests (but not write response, nor is it
 909         sufficient for path based requests).  A smaller size would have
 910         been more efficient (compacting multiple slab items on one 4k page)
 911         for the case in which debug was on, but this larger size allows
 912         more SMBs to use small buffer alloc and is still much more
 913         efficient to alloc 1 per page off the slab compared to 17K (5page)
 914         alloc of large cifs buffers even when page debugging is on */
 915         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
 916                         MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
 917                         NULL);
 918         if (cifs_sm_req_cachep == NULL) {
 919                 mempool_destroy(cifs_req_poolp);
 920                 kmem_cache_destroy(cifs_req_cachep);
 921                 return -ENOMEM;
 922         }
 923
 924         if (cifs_min_small < 2)
 925                 cifs_min_small = 2;
 926         else if (cifs_min_small > 256) {
 927                 cifs_min_small = 256;
 928                 cFYI(1, "cifs_min_small set to maximum (256)");
 929         }
 930
 931         cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
 932                                                      cifs_sm_req_cachep);
 933
 934         if (cifs_sm_req_poolp == NULL) {
 935                 mempool_destroy(cifs_req_poolp);
 936                 kmem_cache_destroy(cifs_req_cachep);
 937                 kmem_cache_destroy(cifs_sm_req_cachep);
 938                 return -ENOMEM;
 939         }
 940
 941         return 0;
 942 }
 943
 944 static void
 945 cifs_destroy_request_bufs(void)
 946 {
 947         mempool_destroy(cifs_req_poolp);
 948         kmem_cache_destroy(cifs_req_cachep);
 949         mempool_destroy(cifs_sm_req_poolp);
 950         kmem_cache_destroy(cifs_sm_req_cachep);
 951 }
 952
 953 static int
 954 cifs_init_mids(void)
 955 {
 956         cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
 957                                             sizeof(struct mid_q_entry), 0,
 958                                             SLAB_HWCACHE_ALIGN, NULL);
 959         if (cifs_mid_cachep == NULL)
 960                 return -ENOMEM;
 961
 962         /* 3 is a reasonable minimum number of simultaneous operations */
 963         cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
 964         if (cifs_mid_poolp == NULL) {
 965                 kmem_cache_destroy(cifs_mid_cachep);
 966                 return -ENOMEM;
 967         }
 968
 969         return 0;
 970 }
 971
 972 static void
 973 cifs_destroy_mids(void)
 974 {
 975         mempool_destroy(cifs_mid_poolp);
 976         kmem_cache_destroy(cifs_mid_cachep);
 977 }
 978
 979 static int __init
 980 init_cifs(void)
 981 {
 982         int rc = 0;
 983         cifs_proc_init();
 984         INIT_LIST_HEAD(&cifs_tcp_ses_list);
 985 #ifdef CONFIG_CIFS_EXPERIMENTAL
 986         INIT_LIST_HEAD(&GlobalDnotifyReqList);
 987         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
 988 #endif
 989 /*
 990  *  Initialize Global counters
 991  */
 992         atomic_set(&sesInfoAllocCount, 0);
 993         atomic_set(&tconInfoAllocCount, 0);
 994         atomic_set(&tcpSesAllocCount, 0);
 995         atomic_set(&tcpSesReconnectCount, 0);
 996         atomic_set(&tconInfoReconnectCount, 0);
 997
 998         atomic_set(&bufAllocCount, 0);
 999         atomic_set(&smBufAllocCount, 0);
1000 #ifdef CONFIG_CIFS_STATS2
1001         atomic_set(&totBufAllocCount, 0);
1002         atomic_set(&totSmBufAllocCount, 0);
1003 #endif /* CONFIG_CIFS_STATS2 */
1004
1005         atomic_set(&midCount, 0);
1006         GlobalCurrentXid = 0;
1007         GlobalTotalActiveXid = 0;
1008         GlobalMaxActiveXid = 0;
1009         spin_lock_init(&cifs_tcp_ses_lock);
1010         spin_lock_init(&cifs_file_list_lock);
1011         spin_lock_init(&GlobalMid_Lock);
1012
1013         if (cifs_max_pending < 2) {
1014                 cifs_max_pending = 2;
1015                 cFYI(1, "cifs_max_pending set to min of 2");
1016         } else if (cifs_max_pending > 256) {
1017                 cifs_max_pending = 256;
1018                 cFYI(1, "cifs_max_pending set to max of 256");
1019         }
1020
1021         rc = cifs_fscache_register();
1022         if (rc)
1023                 goto out_clean_proc;
1024
1025         rc = cifs_init_inodecache();
1026         if (rc)
1027                 goto out_unreg_fscache;
1028
1029         rc = cifs_init_mids();
1030         if (rc)
1031                 goto out_destroy_inodecache;
1032
1033         rc = cifs_init_request_bufs();
1034         if (rc)
1035                 goto out_destroy_mids;
1036
1037         rc = register_filesystem(&cifs_fs_type);
1038         if (rc)
1039                 goto out_destroy_request_bufs;
1040 #ifdef CONFIG_CIFS_UPCALL
1041         rc = register_key_type(&cifs_spnego_key_type);
1042         if (rc)
1043                 goto out_unregister_filesystem;
1044 #endif
1045
1046         return 0;
1047
1048 #ifdef CONFIG_CIFS_UPCALL
1049 out_unregister_filesystem:
1050         unregister_filesystem(&cifs_fs_type);
1051 #endif
1052 out_destroy_request_bufs:
1053         cifs_destroy_request_bufs();
1054 out_destroy_mids:
1055         cifs_destroy_mids();
1056 out_destroy_inodecache:
1057         cifs_destroy_inodecache();
1058 out_unreg_fscache:
1059         cifs_fscache_unregister();
1060 out_clean_proc:
1061         cifs_proc_clean();
1062         return rc;
1063 }
1064
1065 static void __exit
1066 exit_cifs(void)
1067 {
1068         cFYI(DBG2, "exit_cifs");
1069         cifs_proc_clean();
1070         cifs_fscache_unregister();
1071 #ifdef CONFIG_CIFS_DFS_UPCALL
1072         cifs_dfs_release_automount_timer();
1073 #endif
1074 #ifdef CONFIG_CIFS_UPCALL
1075         unregister_key_type(&cifs_spnego_key_type);
1076 #endif
1077         unregister_filesystem(&cifs_fs_type);
1078         cifs_destroy_inodecache();
1079         cifs_destroy_mids();
1080         cifs_destroy_request_bufs();
1081 }
1082
1083 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1084 MODULE_LICENSE("GPL");  /* combination of LGPL + GPL source behaves as GPL */
1085 MODULE_DESCRIPTION
1086     ("VFS to access servers complying with the SNIA CIFS Specification "
1087      "e.g. Samba and Windows");
1088 MODULE_VERSION(CIFS_VERSION);
1089 module_init(init_cifs)
1090 module_exit(exit_cifs)