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/smp_lock.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 "dns_resolve.h"
  49 #include "cifs_spnego.h"
  50 #define CIFS_MAGIC_NUMBER 0xFF534D42    /* the first four bytes of SMB PDUs */
  51
  52 #ifdef CONFIG_CIFS_QUOTA
  53 static const struct quotactl_ops cifs_quotactl_ops;
  54 #endif /* QUOTA */
  55
  56 int cifsFYI = 0;
  57 int cifsERROR = 1;
  58 int traceSMB = 0;
  59 unsigned int oplockEnabled = 1;
  60 unsigned int experimEnabled = 0;
  61 unsigned int linuxExtEnabled = 1;
  62 unsigned int lookupCacheEnabled = 1;
  63 unsigned int multiuser_mount = 0;
  64 unsigned int extended_security = CIFSSEC_DEF;
  65 /* unsigned int ntlmv2_support = 0; */
  66 unsigned int sign_CIFS_PDUs = 1;
  67 static const struct super_operations cifs_super_ops;
  68 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
  69 module_param(CIFSMaxBufSize, int, 0);
  70 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header). "
  71                                  "Default: 16384 Range: 8192 to 130048");
  72 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
  73 module_param(cifs_min_rcv, int, 0);
  74 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
  75                                 "1 to 64");
  76 unsigned int cifs_min_small = 30;
  77 module_param(cifs_min_small, int, 0);
  78 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
  79                                  "Range: 2 to 256");
  80 unsigned int cifs_max_pending = CIFS_MAX_REQ;
  81 module_param(cifs_max_pending, int, 0);
  82 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. "
  83                                    "Default: 50 Range: 2 to 256");
  84
  85 extern mempool_t *cifs_sm_req_poolp;
  86 extern mempool_t *cifs_req_poolp;
  87 extern mempool_t *cifs_mid_poolp;
  88
  89 extern struct kmem_cache *cifs_oplock_cachep;
  90
  91 static int
  92 cifs_read_super(struct super_block *sb, void *data,
  93                 const char *devname, int silent)
  94 {
  95         struct inode *inode;
  96         struct cifs_sb_info *cifs_sb;
  97         int rc = 0;
  98
  99         /* BB should we make this contingent on mount parm? */
 100         sb->s_flags |= MS_NODIRATIME | MS_NOATIME;
 101         sb->s_fs_info = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
 102         cifs_sb = CIFS_SB(sb);
 103         if (cifs_sb == NULL)
 104                 return -ENOMEM;
 105
 106 #ifdef CONFIG_CIFS_DFS_UPCALL
 107         /* copy mount params to sb for use in submounts */
 108         /* BB: should we move this after the mount so we
 109          * do not have to do the copy on failed mounts?
 110          * BB: May be it is better to do simple copy before
 111          * complex operation (mount), and in case of fail
 112          * just exit instead of doing mount and attempting
 113          * undo it if this copy fails?*/
 114         if (data) {
 115                 int len = strlen(data);
 116                 cifs_sb->mountdata = kzalloc(len + 1, GFP_KERNEL);
 117                 if (cifs_sb->mountdata == NULL) {
 118                         kfree(sb->s_fs_info);
 119                         sb->s_fs_info = NULL;
 120                         return -ENOMEM;
 121                 }
 122                 strncpy(cifs_sb->mountdata, data, len + 1);
 123                 cifs_sb->mountdata[len] = '\0';
 124         }
 125 #endif
 126
 127         rc = cifs_mount(sb, cifs_sb, data, devname);
 128
 129         if (rc) {
 130                 if (!silent)
 131                         cERROR(1,
 132                                ("cifs_mount failed w/return code = %d", rc));
 133                 goto out_mount_failed;
 134         }
 135
 136         sb->s_magic = CIFS_MAGIC_NUMBER;
 137         sb->s_op = &cifs_super_ops;
 138 /*      if (cifs_sb->tcon->ses->server->maxBuf > MAX_CIFS_HDR_SIZE + 512)
 139             sb->s_blocksize =
 140                 cifs_sb->tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE; */
 141 #ifdef CONFIG_CIFS_QUOTA
 142         sb->s_qcop = &cifs_quotactl_ops;
 143 #endif
 144         sb->s_blocksize = CIFS_MAX_MSGSIZE;
 145         sb->s_blocksize_bits = 14;      /* default 2**14 = CIFS_MAX_MSGSIZE */
 146         inode = cifs_root_iget(sb, ROOT_I);
 147
 148         if (IS_ERR(inode)) {
 149                 rc = PTR_ERR(inode);
 150                 inode = NULL;
 151                 goto out_no_root;
 152         }
 153
 154         sb->s_root = d_alloc_root(inode);
 155
 156         if (!sb->s_root) {
 157                 rc = -ENOMEM;
 158                 goto out_no_root;
 159         }
 160
 161 #ifdef CONFIG_CIFS_EXPERIMENTAL
 162         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 163                 cFYI(1, ("export ops supported"));
 164                 sb->s_export_op = &cifs_export_ops;
 165         }
 166 #endif /* EXPERIMENTAL */
 167
 168         return 0;
 169
 170 out_no_root:
 171         cERROR(1, ("cifs_read_super: get root inode failed"));
 172         if (inode)
 173                 iput(inode);
 174
 175         cifs_umount(sb, cifs_sb);
 176
 177 out_mount_failed:
 178         if (cifs_sb) {
 179 #ifdef CONFIG_CIFS_DFS_UPCALL
 180                 if (cifs_sb->mountdata) {
 181                         kfree(cifs_sb->mountdata);
 182                         cifs_sb->mountdata = NULL;
 183                 }
 184 #endif
 185                 unload_nls(cifs_sb->local_nls);
 186                 kfree(cifs_sb);
 187         }
 188         return rc;
 189 }
 190
 191 static void
 192 cifs_put_super(struct super_block *sb)
 193 {
 194         int rc = 0;
 195         struct cifs_sb_info *cifs_sb;
 196
 197         cFYI(1, ("In cifs_put_super"));
 198         cifs_sb = CIFS_SB(sb);
 199         if (cifs_sb == NULL) {
 200                 cFYI(1, ("Empty cifs superblock info passed to unmount"));
 201                 return;
 202         }
 203
 204         lock_kernel();
 205
 206         rc = cifs_umount(sb, cifs_sb);
 207         if (rc)
 208                 cERROR(1, ("cifs_umount failed with return code %d", rc));
 209 #ifdef CONFIG_CIFS_DFS_UPCALL
 210         if (cifs_sb->mountdata) {
 211                 kfree(cifs_sb->mountdata);
 212                 cifs_sb->mountdata = NULL;
 213         }
 214 #endif
 215
 216         unload_nls(cifs_sb->local_nls);
 217         kfree(cifs_sb);
 218
 219         unlock_kernel();
 220 }
 221
 222 static int
 223 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
 224 {
 225         struct super_block *sb = dentry->d_sb;
 226         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 227         struct cifsTconInfo *tcon = cifs_sb->tcon;
 228         int rc = -EOPNOTSUPP;
 229         int xid;
 230
 231         xid = GetXid();
 232
 233         buf->f_type = CIFS_MAGIC_NUMBER;
 234
 235         /*
 236          * PATH_MAX may be too long - it would presumably be total path,
 237          * but note that some servers (includinng Samba 3) have a shorter
 238          * maximum path.
 239          *
 240          * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
 241          */
 242         buf->f_namelen = PATH_MAX;
 243         buf->f_files = 0;       /* undefined */
 244         buf->f_ffree = 0;       /* unlimited */
 245
 246         /*
 247          * We could add a second check for a QFS Unix capability bit
 248          */
 249         if ((tcon->ses->capabilities & CAP_UNIX) &&
 250             (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability)))
 251                 rc = CIFSSMBQFSPosixInfo(xid, tcon, buf);
 252
 253         /*
 254          * Only need to call the old QFSInfo if failed on newer one,
 255          * e.g. by OS/2.
 256          **/
 257         if (rc && (tcon->ses->capabilities & CAP_NT_SMBS))
 258                 rc = CIFSSMBQFSInfo(xid, tcon, buf);
 259
 260         /*
 261          * Some old Windows servers also do not support level 103, retry with
 262          * older level one if old server failed the previous call or we
 263          * bypassed it because we detected that this was an older LANMAN sess
 264          */
 265         if (rc)
 266                 rc = SMBOldQFSInfo(xid, tcon, buf);
 267
 268         FreeXid(xid);
 269         return 0;
 270 }
 271
 272 static int cifs_permission(struct inode *inode, int mask)
 273 {
 274         struct cifs_sb_info *cifs_sb;
 275
 276         cifs_sb = CIFS_SB(inode->i_sb);
 277
 278         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
 279                 if ((mask & MAY_EXEC) && !execute_ok(inode))
 280                         return -EACCES;
 281                 else
 282                         return 0;
 283         } else /* file mode might have been restricted at mount time
 284                 on the client (above and beyond ACL on servers) for
 285                 servers which do not support setting and viewing mode bits,
 286                 so allowing client to check permissions is useful */
 287                 return generic_permission(inode, mask, NULL);
 288 }
 289
 290 static struct kmem_cache *cifs_inode_cachep;
 291 static struct kmem_cache *cifs_req_cachep;
 292 static struct kmem_cache *cifs_mid_cachep;
 293 struct kmem_cache *cifs_oplock_cachep;
 294 static struct kmem_cache *cifs_sm_req_cachep;
 295 mempool_t *cifs_sm_req_poolp;
 296 mempool_t *cifs_req_poolp;
 297 mempool_t *cifs_mid_poolp;
 298
 299 static struct inode *
 300 cifs_alloc_inode(struct super_block *sb)
 301 {
 302         struct cifsInodeInfo *cifs_inode;
 303         cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
 304         if (!cifs_inode)
 305                 return NULL;
 306         cifs_inode->cifsAttrs = 0x20;   /* default */
 307         cifs_inode->time = 0;
 308         cifs_inode->write_behind_rc = 0;
 309         /* Until the file is open and we have gotten oplock
 310         info back from the server, can not assume caching of
 311         file data or metadata */
 312         cifs_inode->clientCanCacheRead = false;
 313         cifs_inode->clientCanCacheAll = false;
 314         cifs_inode->delete_pending = false;
 315         cifs_inode->invalid_mapping = false;
 316         cifs_inode->vfs_inode.i_blkbits = 14;  /* 2**14 = CIFS_MAX_MSGSIZE */
 317         cifs_inode->server_eof = 0;
 318
 319         /* Can not set i_flags here - they get immediately overwritten
 320            to zero by the VFS */
 321 /*      cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;*/
 322         INIT_LIST_HEAD(&cifs_inode->openFileList);
 323         return &cifs_inode->vfs_inode;
 324 }
 325
 326 static void
 327 cifs_destroy_inode(struct inode *inode)
 328 {
 329         kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
 330 }
 331
 332 static void
 333 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
 334 {
 335         seq_printf(s, ",addr=");
 336
 337         switch (server->addr.sockAddr.sin_family) {
 338         case AF_INET:
 339                 seq_printf(s, "%pI4", &server->addr.sockAddr.sin_addr.s_addr);
 340                 break;
 341         case AF_INET6:
 342                 seq_printf(s, "%pI6",
 343                            &server->addr.sockAddr6.sin6_addr.s6_addr);
 344                 if (server->addr.sockAddr6.sin6_scope_id)
 345                         seq_printf(s, "%%%u",
 346                                    server->addr.sockAddr6.sin6_scope_id);
 347                 break;
 348         default:
 349                 seq_printf(s, "(unknown)");
 350         }
 351 }
 352
 353 /*
 354  * cifs_show_options() is for displaying mount options in /proc/mounts.
 355  * Not all settable options are displayed but most of the important
 356  * ones are.
 357  */
 358 static int
 359 cifs_show_options(struct seq_file *s, struct vfsmount *m)
 360 {
 361         struct cifs_sb_info *cifs_sb = CIFS_SB(m->mnt_sb);
 362         struct cifsTconInfo *tcon = cifs_sb->tcon;
 363
 364         seq_printf(s, ",unc=%s", tcon->treeName);
 365         if (tcon->ses->userName)
 366                 seq_printf(s, ",username=%s", tcon->ses->userName);
 367         if (tcon->ses->domainName)
 368                 seq_printf(s, ",domain=%s", tcon->ses->domainName);
 369
 370         seq_printf(s, ",uid=%d", cifs_sb->mnt_uid);
 371         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
 372                 seq_printf(s, ",forceuid");
 373         else
 374                 seq_printf(s, ",noforceuid");
 375
 376         seq_printf(s, ",gid=%d", cifs_sb->mnt_gid);
 377         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
 378                 seq_printf(s, ",forcegid");
 379         else
 380                 seq_printf(s, ",noforcegid");
 381
 382         cifs_show_address(s, tcon->ses->server);
 383
 384         if (!tcon->unix_ext)
 385                 seq_printf(s, ",file_mode=0%o,dir_mode=0%o",
 386                                            cifs_sb->mnt_file_mode,
 387                                            cifs_sb->mnt_dir_mode);
 388         if (tcon->seal)
 389                 seq_printf(s, ",seal");
 390         if (tcon->nocase)
 391                 seq_printf(s, ",nocase");
 392         if (tcon->retry)
 393                 seq_printf(s, ",hard");
 394         if (cifs_sb->prepath)
 395                 seq_printf(s, ",prepath=%s", cifs_sb->prepath);
 396         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 397                 seq_printf(s, ",posixpaths");
 398         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
 399                 seq_printf(s, ",setuids");
 400         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 401                 seq_printf(s, ",serverino");
 402         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
 403                 seq_printf(s, ",directio");
 404         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 405                 seq_printf(s, ",nouser_xattr");
 406         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 407                 seq_printf(s, ",mapchars");
 408         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
 409                 seq_printf(s, ",sfu");
 410         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 411                 seq_printf(s, ",nobrl");
 412         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
 413                 seq_printf(s, ",cifsacl");
 414         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
 415                 seq_printf(s, ",dynperm");
 416         if (m->mnt_sb->s_flags & MS_POSIXACL)
 417                 seq_printf(s, ",acl");
 418
 419         seq_printf(s, ",rsize=%d", cifs_sb->rsize);
 420         seq_printf(s, ",wsize=%d", cifs_sb->wsize);
 421
 422         return 0;
 423 }
 424
 425 #ifdef CONFIG_CIFS_QUOTA
 426 int cifs_xquota_set(struct super_block *sb, int quota_type, qid_t qid,
 427                 struct fs_disk_quota *pdquota)
 428 {
 429         int xid;
 430         int rc = 0;
 431         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 432         struct cifsTconInfo *pTcon;
 433
 434         if (cifs_sb)
 435                 pTcon = cifs_sb->tcon;
 436         else
 437                 return -EIO;
 438
 439
 440         xid = GetXid();
 441         if (pTcon) {
 442                 cFYI(1, ("set type: 0x%x id: %d", quota_type, qid));
 443         } else
 444                 rc = -EIO;
 445
 446         FreeXid(xid);
 447         return rc;
 448 }
 449
 450 int cifs_xquota_get(struct super_block *sb, int quota_type, qid_t qid,
 451                     struct fs_disk_quota *pdquota)
 452 {
 453         int xid;
 454         int rc = 0;
 455         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 456         struct cifsTconInfo *pTcon;
 457
 458         if (cifs_sb)
 459                 pTcon = cifs_sb->tcon;
 460         else
 461                 return -EIO;
 462
 463         xid = GetXid();
 464         if (pTcon) {
 465                 cFYI(1, ("set type: 0x%x id: %d", quota_type, qid));
 466         } else
 467                 rc = -EIO;
 468
 469         FreeXid(xid);
 470         return rc;
 471 }
 472
 473 int cifs_xstate_set(struct super_block *sb, unsigned int flags, int operation)
 474 {
 475         int xid;
 476         int rc = 0;
 477         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 478         struct cifsTconInfo *pTcon;
 479
 480         if (cifs_sb)
 481                 pTcon = cifs_sb->tcon;
 482         else
 483                 return -EIO;
 484
 485         xid = GetXid();
 486         if (pTcon) {
 487                 cFYI(1, ("flags: 0x%x operation: 0x%x", flags, operation));
 488         } else
 489                 rc = -EIO;
 490
 491         FreeXid(xid);
 492         return rc;
 493 }
 494
 495 int cifs_xstate_get(struct super_block *sb, struct fs_quota_stat *qstats)
 496 {
 497         int xid;
 498         int rc = 0;
 499         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 500         struct cifsTconInfo *pTcon;
 501
 502         if (cifs_sb)
 503                 pTcon = cifs_sb->tcon;
 504         else
 505                 return -EIO;
 506
 507         xid = GetXid();
 508         if (pTcon) {
 509                 cFYI(1, ("pqstats %p", qstats));
 510         } else
 511                 rc = -EIO;
 512
 513         FreeXid(xid);
 514         return rc;
 515 }
 516
 517 static const struct quotactl_ops cifs_quotactl_ops = {
 518         .set_xquota     = cifs_xquota_set,
 519         .get_xquota     = cifs_xquota_get,
 520         .set_xstate     = cifs_xstate_set,
 521         .get_xstate     = cifs_xstate_get,
 522 };
 523 #endif
 524
 525 static void cifs_umount_begin(struct super_block *sb)
 526 {
 527         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 528         struct cifsTconInfo *tcon;
 529
 530         if (cifs_sb == NULL)
 531                 return;
 532
 533         tcon = cifs_sb->tcon;
 534         if (tcon == NULL)
 535                 return;
 536
 537         read_lock(&cifs_tcp_ses_lock);
 538         if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
 539                 /* we have other mounts to same share or we have
 540                    already tried to force umount this and woken up
 541                    all waiting network requests, nothing to do */
 542                 read_unlock(&cifs_tcp_ses_lock);
 543                 return;
 544         } else if (tcon->tc_count == 1)
 545                 tcon->tidStatus = CifsExiting;
 546         read_unlock(&cifs_tcp_ses_lock);
 547
 548         /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
 549         /* cancel_notify_requests(tcon); */
 550         if (tcon->ses && tcon->ses->server) {
 551                 cFYI(1, ("wake up tasks now - umount begin not complete"));
 552                 wake_up_all(&tcon->ses->server->request_q);
 553                 wake_up_all(&tcon->ses->server->response_q);
 554                 msleep(1); /* yield */
 555                 /* we have to kick the requests once more */
 556                 wake_up_all(&tcon->ses->server->response_q);
 557                 msleep(1);
 558         }
 559
 560         return;
 561 }
 562
 563 #ifdef CONFIG_CIFS_STATS2
 564 static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt)
 565 {
 566         /* BB FIXME */
 567         return 0;
 568 }
 569 #endif
 570
 571 static int cifs_remount(struct super_block *sb, int *flags, char *data)
 572 {
 573         *flags |= MS_NODIRATIME;
 574         return 0;
 575 }
 576
 577 static const struct super_operations cifs_super_ops = {
 578         .put_super = cifs_put_super,
 579         .statfs = cifs_statfs,
 580         .alloc_inode = cifs_alloc_inode,
 581         .destroy_inode = cifs_destroy_inode,
 582 /*      .drop_inode         = generic_delete_inode,
 583         .delete_inode   = cifs_delete_inode,  */  /* Do not need above two
 584         functions unless later we add lazy close of inodes or unless the
 585         kernel forgets to call us with the same number of releases (closes)
 586         as opens */
 587         .show_options = cifs_show_options,
 588         .umount_begin   = cifs_umount_begin,
 589         .remount_fs = cifs_remount,
 590 #ifdef CONFIG_CIFS_STATS2
 591         .show_stats = cifs_show_stats,
 592 #endif
 593 };
 594
 595 static int
 596 cifs_get_sb(struct file_system_type *fs_type,
 597             int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 598 {
 599         int rc;
 600         struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);
 601
 602         cFYI(1, ("Devname: %s flags: %d ", dev_name, flags));
 603
 604         if (IS_ERR(sb))
 605                 return PTR_ERR(sb);
 606
 607         sb->s_flags = flags;
 608
 609         rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
 610         if (rc) {
 611                 deactivate_locked_super(sb);
 612                 return rc;
 613         }
 614         sb->s_flags |= MS_ACTIVE;
 615         simple_set_mnt(mnt, sb);
 616         return 0;
 617 }
 618
 619 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 620                                    unsigned long nr_segs, loff_t pos)
 621 {
 622         struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
 623         ssize_t written;
 624
 625         written = generic_file_aio_write(iocb, iov, nr_segs, pos);
 626         if (!CIFS_I(inode)->clientCanCacheAll)
 627                 filemap_fdatawrite(inode->i_mapping);
 628         return written;
 629 }
 630
 631 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
 632 {
 633         /* origin == SEEK_END => we must revalidate the cached file length */
 634         if (origin == SEEK_END) {
 635                 int retval;
 636
 637                 /* some applications poll for the file length in this strange
 638                    way so we must seek to end on non-oplocked files by
 639                    setting the revalidate time to zero */
 640                 CIFS_I(file->f_path.dentry->d_inode)->time = 0;
 641
 642                 retval = cifs_revalidate_file(file);
 643                 if (retval < 0)
 644                         return (loff_t)retval;
 645         }
 646         return generic_file_llseek_unlocked(file, offset, origin);
 647 }
 648
 649 #ifdef CONFIG_CIFS_EXPERIMENTAL
 650 static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
 651 {
 652         /* note that this is called by vfs setlease with the BKL held
 653            although I doubt that BKL is needed here in cifs */
 654         struct inode *inode = file->f_path.dentry->d_inode;
 655
 656         if (!(S_ISREG(inode->i_mode)))
 657                 return -EINVAL;
 658
 659         /* check if file is oplocked */
 660         if (((arg == F_RDLCK) &&
 661                 (CIFS_I(inode)->clientCanCacheRead)) ||
 662             ((arg == F_WRLCK) &&
 663                 (CIFS_I(inode)->clientCanCacheAll)))
 664                 return generic_setlease(file, arg, lease);
 665         else if (CIFS_SB(inode->i_sb)->tcon->local_lease &&
 666                         !CIFS_I(inode)->clientCanCacheRead)
 667                 /* If the server claims to support oplock on this
 668                    file, then we still need to check oplock even
 669                    if the local_lease mount option is set, but there
 670                    are servers which do not support oplock for which
 671                    this mount option may be useful if the user
 672                    knows that the file won't be changed on the server
 673                    by anyone else */
 674                 return generic_setlease(file, arg, lease);
 675         else
 676                 return -EAGAIN;
 677 }
 678 #endif
 679
 680 struct file_system_type cifs_fs_type = {
 681         .owner = THIS_MODULE,
 682         .name = "cifs",
 683         .get_sb = cifs_get_sb,
 684         .kill_sb = kill_anon_super,
 685         /*  .fs_flags */
 686 };
 687 const struct inode_operations cifs_dir_inode_ops = {
 688         .create = cifs_create,
 689         .lookup = cifs_lookup,
 690         .getattr = cifs_getattr,
 691         .unlink = cifs_unlink,
 692         .link = cifs_hardlink,
 693         .mkdir = cifs_mkdir,
 694         .rmdir = cifs_rmdir,
 695         .rename = cifs_rename,
 696         .permission = cifs_permission,
 697 /*      revalidate:cifs_revalidate,   */
 698         .setattr = cifs_setattr,
 699         .symlink = cifs_symlink,
 700         .mknod   = cifs_mknod,
 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_file_inode_ops = {
 710 /*      revalidate:cifs_revalidate, */
 711         .setattr = cifs_setattr,
 712         .getattr = cifs_getattr, /* do we need this anymore? */
 713         .rename = cifs_rename,
 714         .permission = cifs_permission,
 715 #ifdef CONFIG_CIFS_XATTR
 716         .setxattr = cifs_setxattr,
 717         .getxattr = cifs_getxattr,
 718         .listxattr = cifs_listxattr,
 719         .removexattr = cifs_removexattr,
 720 #endif
 721 };
 722
 723 const struct inode_operations cifs_symlink_inode_ops = {
 724         .readlink = generic_readlink,
 725         .follow_link = cifs_follow_link,
 726         .put_link = cifs_put_link,
 727         .permission = cifs_permission,
 728         /* BB add the following two eventually */
 729         /* revalidate: cifs_revalidate,
 730            setattr:    cifs_notify_change, *//* BB do we need notify change */
 731 #ifdef CONFIG_CIFS_XATTR
 732         .setxattr = cifs_setxattr,
 733         .getxattr = cifs_getxattr,
 734         .listxattr = cifs_listxattr,
 735         .removexattr = cifs_removexattr,
 736 #endif
 737 };
 738
 739 const struct file_operations cifs_file_ops = {
 740         .read = do_sync_read,
 741         .write = do_sync_write,
 742         .aio_read = generic_file_aio_read,
 743         .aio_write = cifs_file_aio_write,
 744         .open = cifs_open,
 745         .release = cifs_close,
 746         .lock = cifs_lock,
 747         .fsync = cifs_fsync,
 748         .flush = cifs_flush,
 749         .mmap  = cifs_file_mmap,
 750         .splice_read = generic_file_splice_read,
 751         .llseek = cifs_llseek,
 752 #ifdef CONFIG_CIFS_POSIX
 753         .unlocked_ioctl = cifs_ioctl,
 754 #endif /* CONFIG_CIFS_POSIX */
 755
 756 #ifdef CONFIG_CIFS_EXPERIMENTAL
 757         .setlease = cifs_setlease,
 758 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 759 };
 760
 761 const struct file_operations cifs_file_direct_ops = {
 762         /* no aio, no readv -
 763            BB reevaluate whether they can be done with directio, no cache */
 764         .read = cifs_user_read,
 765         .write = cifs_user_write,
 766         .open = cifs_open,
 767         .release = cifs_close,
 768         .lock = cifs_lock,
 769         .fsync = cifs_fsync,
 770         .flush = cifs_flush,
 771         .mmap = cifs_file_mmap,
 772         .splice_read = generic_file_splice_read,
 773 #ifdef CONFIG_CIFS_POSIX
 774         .unlocked_ioctl  = cifs_ioctl,
 775 #endif /* CONFIG_CIFS_POSIX */
 776         .llseek = cifs_llseek,
 777 #ifdef CONFIG_CIFS_EXPERIMENTAL
 778         .setlease = cifs_setlease,
 779 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 780 };
 781 const struct file_operations cifs_file_nobrl_ops = {
 782         .read = do_sync_read,
 783         .write = do_sync_write,
 784         .aio_read = generic_file_aio_read,
 785         .aio_write = cifs_file_aio_write,
 786         .open = cifs_open,
 787         .release = cifs_close,
 788         .fsync = cifs_fsync,
 789         .flush = cifs_flush,
 790         .mmap  = cifs_file_mmap,
 791         .splice_read = generic_file_splice_read,
 792         .llseek = cifs_llseek,
 793 #ifdef CONFIG_CIFS_POSIX
 794         .unlocked_ioctl = cifs_ioctl,
 795 #endif /* CONFIG_CIFS_POSIX */
 796
 797 #ifdef CONFIG_CIFS_EXPERIMENTAL
 798         .setlease = cifs_setlease,
 799 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 800 };
 801
 802 const struct file_operations cifs_file_direct_nobrl_ops = {
 803         /* no mmap, no aio, no readv -
 804            BB reevaluate whether they can be done with directio, no cache */
 805         .read = cifs_user_read,
 806         .write = cifs_user_write,
 807         .open = cifs_open,
 808         .release = cifs_close,
 809         .fsync = cifs_fsync,
 810         .flush = cifs_flush,
 811         .splice_read = generic_file_splice_read,
 812 #ifdef CONFIG_CIFS_POSIX
 813         .unlocked_ioctl  = cifs_ioctl,
 814 #endif /* CONFIG_CIFS_POSIX */
 815         .llseek = cifs_llseek,
 816 #ifdef CONFIG_CIFS_EXPERIMENTAL
 817         .setlease = cifs_setlease,
 818 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 819 };
 820
 821 const struct file_operations cifs_dir_ops = {
 822         .readdir = cifs_readdir,
 823         .release = cifs_closedir,
 824         .read    = generic_read_dir,
 825         .unlocked_ioctl  = cifs_ioctl,
 826         .llseek = generic_file_llseek,
 827 };
 828
 829 static void
 830 cifs_init_once(void *inode)
 831 {
 832         struct cifsInodeInfo *cifsi = inode;
 833
 834         inode_init_once(&cifsi->vfs_inode);
 835         INIT_LIST_HEAD(&cifsi->lockList);
 836 }
 837
 838 static int
 839 cifs_init_inodecache(void)
 840 {
 841         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
 842                                               sizeof(struct cifsInodeInfo),
 843                                               0, (SLAB_RECLAIM_ACCOUNT|
 844                                                 SLAB_MEM_SPREAD),
 845                                               cifs_init_once);
 846         if (cifs_inode_cachep == NULL)
 847                 return -ENOMEM;
 848
 849         return 0;
 850 }
 851
 852 static void
 853 cifs_destroy_inodecache(void)
 854 {
 855         kmem_cache_destroy(cifs_inode_cachep);
 856 }
 857
 858 static int
 859 cifs_init_request_bufs(void)
 860 {
 861         if (CIFSMaxBufSize < 8192) {
 862         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
 863         Unicode path name has to fit in any SMB/CIFS path based frames */
 864                 CIFSMaxBufSize = 8192;
 865         } else if (CIFSMaxBufSize > 1024*127) {
 866                 CIFSMaxBufSize = 1024 * 127;
 867         } else {
 868                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
 869         }
 870 /*      cERROR(1,("CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize)); */
 871         cifs_req_cachep = kmem_cache_create("cifs_request",
 872                                             CIFSMaxBufSize +
 873                                             MAX_CIFS_HDR_SIZE, 0,
 874                                             SLAB_HWCACHE_ALIGN, NULL);
 875         if (cifs_req_cachep == NULL)
 876                 return -ENOMEM;
 877
 878         if (cifs_min_rcv < 1)
 879                 cifs_min_rcv = 1;
 880         else if (cifs_min_rcv > 64) {
 881                 cifs_min_rcv = 64;
 882                 cERROR(1, ("cifs_min_rcv set to maximum (64)"));
 883         }
 884
 885         cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
 886                                                   cifs_req_cachep);
 887
 888         if (cifs_req_poolp == NULL) {
 889                 kmem_cache_destroy(cifs_req_cachep);
 890                 return -ENOMEM;
 891         }
 892         /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
 893         almost all handle based requests (but not write response, nor is it
 894         sufficient for path based requests).  A smaller size would have
 895         been more efficient (compacting multiple slab items on one 4k page)
 896         for the case in which debug was on, but this larger size allows
 897         more SMBs to use small buffer alloc and is still much more
 898         efficient to alloc 1 per page off the slab compared to 17K (5page)
 899         alloc of large cifs buffers even when page debugging is on */
 900         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
 901                         MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
 902                         NULL);
 903         if (cifs_sm_req_cachep == NULL) {
 904                 mempool_destroy(cifs_req_poolp);
 905                 kmem_cache_destroy(cifs_req_cachep);
 906                 return -ENOMEM;
 907         }
 908
 909         if (cifs_min_small < 2)
 910                 cifs_min_small = 2;
 911         else if (cifs_min_small > 256) {
 912                 cifs_min_small = 256;
 913                 cFYI(1, ("cifs_min_small set to maximum (256)"));
 914         }
 915
 916         cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
 917                                                      cifs_sm_req_cachep);
 918
 919         if (cifs_sm_req_poolp == NULL) {
 920                 mempool_destroy(cifs_req_poolp);
 921                 kmem_cache_destroy(cifs_req_cachep);
 922                 kmem_cache_destroy(cifs_sm_req_cachep);
 923                 return -ENOMEM;
 924         }
 925
 926         return 0;
 927 }
 928
 929 static void
 930 cifs_destroy_request_bufs(void)
 931 {
 932         mempool_destroy(cifs_req_poolp);
 933         kmem_cache_destroy(cifs_req_cachep);
 934         mempool_destroy(cifs_sm_req_poolp);
 935         kmem_cache_destroy(cifs_sm_req_cachep);
 936 }
 937
 938 static int
 939 cifs_init_mids(void)
 940 {
 941         cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
 942                                             sizeof(struct mid_q_entry), 0,
 943                                             SLAB_HWCACHE_ALIGN, NULL);
 944         if (cifs_mid_cachep == NULL)
 945                 return -ENOMEM;
 946
 947         /* 3 is a reasonable minimum number of simultaneous operations */
 948         cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
 949         if (cifs_mid_poolp == NULL) {
 950                 kmem_cache_destroy(cifs_mid_cachep);
 951                 return -ENOMEM;
 952         }
 953
 954         cifs_oplock_cachep = kmem_cache_create("cifs_oplock_structs",
 955                                         sizeof(struct oplock_q_entry), 0,
 956                                         SLAB_HWCACHE_ALIGN, NULL);
 957         if (cifs_oplock_cachep == NULL) {
 958                 mempool_destroy(cifs_mid_poolp);
 959                 kmem_cache_destroy(cifs_mid_cachep);
 960                 return -ENOMEM;
 961         }
 962
 963         return 0;
 964 }
 965
 966 static void
 967 cifs_destroy_mids(void)
 968 {
 969         mempool_destroy(cifs_mid_poolp);
 970         kmem_cache_destroy(cifs_mid_cachep);
 971         kmem_cache_destroy(cifs_oplock_cachep);
 972 }
 973
 974 static int __init
 975 init_cifs(void)
 976 {
 977         int rc = 0;
 978         cifs_proc_init();
 979         INIT_LIST_HEAD(&cifs_tcp_ses_list);
 980 #ifdef CONFIG_CIFS_EXPERIMENTAL
 981         INIT_LIST_HEAD(&GlobalDnotifyReqList);
 982         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
 983 #endif
 984 /*
 985  *  Initialize Global counters
 986  */
 987         atomic_set(&sesInfoAllocCount, 0);
 988         atomic_set(&tconInfoAllocCount, 0);
 989         atomic_set(&tcpSesAllocCount, 0);
 990         atomic_set(&tcpSesReconnectCount, 0);
 991         atomic_set(&tconInfoReconnectCount, 0);
 992
 993         atomic_set(&bufAllocCount, 0);
 994         atomic_set(&smBufAllocCount, 0);
 995 #ifdef CONFIG_CIFS_STATS2
 996         atomic_set(&totBufAllocCount, 0);
 997         atomic_set(&totSmBufAllocCount, 0);
 998 #endif /* CONFIG_CIFS_STATS2 */
 999
1000         atomic_set(&midCount, 0);
1001         GlobalCurrentXid = 0;
1002         GlobalTotalActiveXid = 0;
1003         GlobalMaxActiveXid = 0;
1004         memset(Local_System_Name, 0, 15);
1005         rwlock_init(&GlobalSMBSeslock);
1006         rwlock_init(&cifs_tcp_ses_lock);
1007         spin_lock_init(&GlobalMid_Lock);
1008
1009         if (cifs_max_pending < 2) {
1010                 cifs_max_pending = 2;
1011                 cFYI(1, ("cifs_max_pending set to min of 2"));
1012         } else if (cifs_max_pending > 256) {
1013                 cifs_max_pending = 256;
1014                 cFYI(1, ("cifs_max_pending set to max of 256"));
1015         }
1016
1017         rc = cifs_init_inodecache();
1018         if (rc)
1019                 goto out_clean_proc;
1020
1021         rc = cifs_init_mids();
1022         if (rc)
1023                 goto out_destroy_inodecache;
1024
1025         rc = cifs_init_request_bufs();
1026         if (rc)
1027                 goto out_destroy_mids;
1028
1029         rc = register_filesystem(&cifs_fs_type);
1030         if (rc)
1031                 goto out_destroy_request_bufs;
1032 #ifdef CONFIG_CIFS_UPCALL
1033         rc = register_key_type(&cifs_spnego_key_type);
1034         if (rc)
1035                 goto out_unregister_filesystem;
1036 #endif
1037 #ifdef CONFIG_CIFS_DFS_UPCALL
1038         rc = register_key_type(&key_type_dns_resolver);
1039         if (rc)
1040                 goto out_unregister_key_type;
1041 #endif
1042         rc = slow_work_register_user(THIS_MODULE);
1043         if (rc)
1044                 goto out_unregister_resolver_key;
1045
1046         return 0;
1047
1048  out_unregister_resolver_key:
1049 #ifdef CONFIG_CIFS_DFS_UPCALL
1050         unregister_key_type(&key_type_dns_resolver);
1051  out_unregister_key_type:
1052 #endif
1053 #ifdef CONFIG_CIFS_UPCALL
1054         unregister_key_type(&cifs_spnego_key_type);
1055  out_unregister_filesystem:
1056 #endif
1057         unregister_filesystem(&cifs_fs_type);
1058  out_destroy_request_bufs:
1059         cifs_destroy_request_bufs();
1060  out_destroy_mids:
1061         cifs_destroy_mids();
1062  out_destroy_inodecache:
1063         cifs_destroy_inodecache();
1064  out_clean_proc:
1065         cifs_proc_clean();
1066         return rc;
1067 }
1068
1069 static void __exit
1070 exit_cifs(void)
1071 {
1072         cFYI(DBG2, ("exit_cifs"));
1073         cifs_proc_clean();
1074 #ifdef CONFIG_CIFS_DFS_UPCALL
1075         cifs_dfs_release_automount_timer();
1076         unregister_key_type(&key_type_dns_resolver);
1077 #endif
1078 #ifdef CONFIG_CIFS_UPCALL
1079         unregister_key_type(&cifs_spnego_key_type);
1080 #endif
1081         unregister_filesystem(&cifs_fs_type);
1082         cifs_destroy_inodecache();
1083         cifs_destroy_mids();
1084         cifs_destroy_request_bufs();
1085 }
1086
1087 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1088 MODULE_LICENSE("GPL");  /* combination of LGPL + GPL source behaves as GPL */
1089 MODULE_DESCRIPTION
1090     ("VFS to access servers complying with the SNIA CIFS Specification "
1091      "e.g. Samba and Windows");
1092 MODULE_VERSION(CIFS_VERSION);
1093 module_init(init_cifs)
1094 module_exit(exit_cifs)