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 global_secflags = 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, "cifs_mount failed w/return code = %d", rc);
 132                 goto out_mount_failed;
 133         }
 134
 135         sb->s_magic = CIFS_MAGIC_NUMBER;
 136         sb->s_op = &cifs_super_ops;
 137 /*      if (cifs_sb->tcon->ses->server->maxBuf > MAX_CIFS_HDR_SIZE + 512)
 138             sb->s_blocksize =
 139                 cifs_sb->tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE; */
 140 #ifdef CONFIG_CIFS_QUOTA
 141         sb->s_qcop = &cifs_quotactl_ops;
 142 #endif
 143         sb->s_blocksize = CIFS_MAX_MSGSIZE;
 144         sb->s_blocksize_bits = 14;      /* default 2**14 = CIFS_MAX_MSGSIZE */
 145         inode = cifs_root_iget(sb, ROOT_I);
 146
 147         if (IS_ERR(inode)) {
 148                 rc = PTR_ERR(inode);
 149                 inode = NULL;
 150                 goto out_no_root;
 151         }
 152
 153         sb->s_root = d_alloc_root(inode);
 154
 155         if (!sb->s_root) {
 156                 rc = -ENOMEM;
 157                 goto out_no_root;
 158         }
 159
 160 #ifdef CONFIG_CIFS_EXPERIMENTAL
 161         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 162                 cFYI(1, "export ops supported");
 163                 sb->s_export_op = &cifs_export_ops;
 164         }
 165 #endif /* EXPERIMENTAL */
 166
 167         return 0;
 168
 169 out_no_root:
 170         cERROR(1, "cifs_read_super: get root inode failed");
 171         if (inode)
 172                 iput(inode);
 173
 174         cifs_umount(sb, cifs_sb);
 175
 176 out_mount_failed:
 177         if (cifs_sb) {
 178 #ifdef CONFIG_CIFS_DFS_UPCALL
 179                 if (cifs_sb->mountdata) {
 180                         kfree(cifs_sb->mountdata);
 181                         cifs_sb->mountdata = NULL;
 182                 }
 183 #endif
 184                 unload_nls(cifs_sb->local_nls);
 185                 kfree(cifs_sb);
 186         }
 187         return rc;
 188 }
 189
 190 static void
 191 cifs_put_super(struct super_block *sb)
 192 {
 193         int rc = 0;
 194         struct cifs_sb_info *cifs_sb;
 195
 196         cFYI(1, "In cifs_put_super");
 197         cifs_sb = CIFS_SB(sb);
 198         if (cifs_sb == NULL) {
 199                 cFYI(1, "Empty cifs superblock info passed to unmount");
 200                 return;
 201         }
 202
 203         lock_kernel();
 204
 205         rc = cifs_umount(sb, cifs_sb);
 206         if (rc)
 207                 cERROR(1, "cifs_umount failed with return code %d", rc);
 208 #ifdef CONFIG_CIFS_DFS_UPCALL
 209         if (cifs_sb->mountdata) {
 210                 kfree(cifs_sb->mountdata);
 211                 cifs_sb->mountdata = NULL;
 212         }
 213 #endif
 214
 215         unload_nls(cifs_sb->local_nls);
 216         kfree(cifs_sb);
 217
 218         unlock_kernel();
 219 }
 220
 221 static int
 222 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
 223 {
 224         struct super_block *sb = dentry->d_sb;
 225         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 226         struct cifsTconInfo *tcon = cifs_sb->tcon;
 227         int rc = -EOPNOTSUPP;
 228         int xid;
 229
 230         xid = GetXid();
 231
 232         buf->f_type = CIFS_MAGIC_NUMBER;
 233
 234         /*
 235          * PATH_MAX may be too long - it would presumably be total path,
 236          * but note that some servers (includinng Samba 3) have a shorter
 237          * maximum path.
 238          *
 239          * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
 240          */
 241         buf->f_namelen = PATH_MAX;
 242         buf->f_files = 0;       /* undefined */
 243         buf->f_ffree = 0;       /* unlimited */
 244
 245         /*
 246          * We could add a second check for a QFS Unix capability bit
 247          */
 248         if ((tcon->ses->capabilities & CAP_UNIX) &&
 249             (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability)))
 250                 rc = CIFSSMBQFSPosixInfo(xid, tcon, buf);
 251
 252         /*
 253          * Only need to call the old QFSInfo if failed on newer one,
 254          * e.g. by OS/2.
 255          **/
 256         if (rc && (tcon->ses->capabilities & CAP_NT_SMBS))
 257                 rc = CIFSSMBQFSInfo(xid, tcon, buf);
 258
 259         /*
 260          * Some old Windows servers also do not support level 103, retry with
 261          * older level one if old server failed the previous call or we
 262          * bypassed it because we detected that this was an older LANMAN sess
 263          */
 264         if (rc)
 265                 rc = SMBOldQFSInfo(xid, tcon, buf);
 266
 267         FreeXid(xid);
 268         return 0;
 269 }
 270
 271 static int cifs_permission(struct inode *inode, int mask)
 272 {
 273         struct cifs_sb_info *cifs_sb;
 274
 275         cifs_sb = CIFS_SB(inode->i_sb);
 276
 277         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
 278                 if ((mask & MAY_EXEC) && !execute_ok(inode))
 279                         return -EACCES;
 280                 else
 281                         return 0;
 282         } else /* file mode might have been restricted at mount time
 283                 on the client (above and beyond ACL on servers) for
 284                 servers which do not support setting and viewing mode bits,
 285                 so allowing client to check permissions is useful */
 286                 return generic_permission(inode, mask, NULL);
 287 }
 288
 289 static struct kmem_cache *cifs_inode_cachep;
 290 static struct kmem_cache *cifs_req_cachep;
 291 static struct kmem_cache *cifs_mid_cachep;
 292 struct kmem_cache *cifs_oplock_cachep;
 293 static struct kmem_cache *cifs_sm_req_cachep;
 294 mempool_t *cifs_sm_req_poolp;
 295 mempool_t *cifs_req_poolp;
 296 mempool_t *cifs_mid_poolp;
 297
 298 static struct inode *
 299 cifs_alloc_inode(struct super_block *sb)
 300 {
 301         struct cifsInodeInfo *cifs_inode;
 302         cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
 303         if (!cifs_inode)
 304                 return NULL;
 305         cifs_inode->cifsAttrs = 0x20;   /* default */
 306         cifs_inode->time = 0;
 307         cifs_inode->write_behind_rc = 0;
 308         /* Until the file is open and we have gotten oplock
 309         info back from the server, can not assume caching of
 310         file data or metadata */
 311         cifs_inode->clientCanCacheRead = false;
 312         cifs_inode->clientCanCacheAll = false;
 313         cifs_inode->delete_pending = false;
 314         cifs_inode->invalid_mapping = false;
 315         cifs_inode->vfs_inode.i_blkbits = 14;  /* 2**14 = CIFS_MAX_MSGSIZE */
 316         cifs_inode->server_eof = 0;
 317
 318         /* Can not set i_flags here - they get immediately overwritten
 319            to zero by the VFS */
 320 /*      cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;*/
 321         INIT_LIST_HEAD(&cifs_inode->openFileList);
 322         return &cifs_inode->vfs_inode;
 323 }
 324
 325 static void
 326 cifs_destroy_inode(struct inode *inode)
 327 {
 328         kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
 329 }
 330
 331 static void
 332 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
 333 {
 334         seq_printf(s, ",addr=");
 335
 336         switch (server->addr.sockAddr.sin_family) {
 337         case AF_INET:
 338                 seq_printf(s, "%pI4", &server->addr.sockAddr.sin_addr.s_addr);
 339                 break;
 340         case AF_INET6:
 341                 seq_printf(s, "%pI6",
 342                            &server->addr.sockAddr6.sin6_addr.s6_addr);
 343                 if (server->addr.sockAddr6.sin6_scope_id)
 344                         seq_printf(s, "%%%u",
 345                                    server->addr.sockAddr6.sin6_scope_id);
 346                 break;
 347         default:
 348                 seq_printf(s, "(unknown)");
 349         }
 350 }
 351
 352 /*
 353  * cifs_show_options() is for displaying mount options in /proc/mounts.
 354  * Not all settable options are displayed but most of the important
 355  * ones are.
 356  */
 357 static int
 358 cifs_show_options(struct seq_file *s, struct vfsmount *m)
 359 {
 360         struct cifs_sb_info *cifs_sb = CIFS_SB(m->mnt_sb);
 361         struct cifsTconInfo *tcon = cifs_sb->tcon;
 362
 363         seq_printf(s, ",unc=%s", tcon->treeName);
 364         if (tcon->ses->userName)
 365                 seq_printf(s, ",username=%s", tcon->ses->userName);
 366         if (tcon->ses->domainName)
 367                 seq_printf(s, ",domain=%s", tcon->ses->domainName);
 368
 369         seq_printf(s, ",uid=%d", cifs_sb->mnt_uid);
 370         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
 371                 seq_printf(s, ",forceuid");
 372         else
 373                 seq_printf(s, ",noforceuid");
 374
 375         seq_printf(s, ",gid=%d", cifs_sb->mnt_gid);
 376         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
 377                 seq_printf(s, ",forcegid");
 378         else
 379                 seq_printf(s, ",noforcegid");
 380
 381         cifs_show_address(s, tcon->ses->server);
 382
 383         if (!tcon->unix_ext)
 384                 seq_printf(s, ",file_mode=0%o,dir_mode=0%o",
 385                                            cifs_sb->mnt_file_mode,
 386                                            cifs_sb->mnt_dir_mode);
 387         if (tcon->seal)
 388                 seq_printf(s, ",seal");
 389         if (tcon->nocase)
 390                 seq_printf(s, ",nocase");
 391         if (tcon->retry)
 392                 seq_printf(s, ",hard");
 393         if (cifs_sb->prepath)
 394                 seq_printf(s, ",prepath=%s", cifs_sb->prepath);
 395         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 396                 seq_printf(s, ",posixpaths");
 397         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
 398                 seq_printf(s, ",setuids");
 399         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 400                 seq_printf(s, ",serverino");
 401         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
 402                 seq_printf(s, ",directio");
 403         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 404                 seq_printf(s, ",nouser_xattr");
 405         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 406                 seq_printf(s, ",mapchars");
 407         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
 408                 seq_printf(s, ",sfu");
 409         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 410                 seq_printf(s, ",nobrl");
 411         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
 412                 seq_printf(s, ",cifsacl");
 413         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
 414                 seq_printf(s, ",dynperm");
 415         if (m->mnt_sb->s_flags & MS_POSIXACL)
 416                 seq_printf(s, ",acl");
 417
 418         seq_printf(s, ",rsize=%d", cifs_sb->rsize);
 419         seq_printf(s, ",wsize=%d", cifs_sb->wsize);
 420
 421         return 0;
 422 }
 423
 424 #ifdef CONFIG_CIFS_QUOTA
 425 int cifs_xquota_set(struct super_block *sb, int quota_type, qid_t qid,
 426                 struct fs_disk_quota *pdquota)
 427 {
 428         int xid;
 429         int rc = 0;
 430         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 431         struct cifsTconInfo *pTcon;
 432
 433         if (cifs_sb)
 434                 pTcon = cifs_sb->tcon;
 435         else
 436                 return -EIO;
 437
 438
 439         xid = GetXid();
 440         if (pTcon) {
 441                 cFYI(1, "set type: 0x%x id: %d", quota_type, qid);
 442         } else
 443                 rc = -EIO;
 444
 445         FreeXid(xid);
 446         return rc;
 447 }
 448
 449 int cifs_xquota_get(struct super_block *sb, int quota_type, qid_t qid,
 450                     struct fs_disk_quota *pdquota)
 451 {
 452         int xid;
 453         int rc = 0;
 454         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 455         struct cifsTconInfo *pTcon;
 456
 457         if (cifs_sb)
 458                 pTcon = cifs_sb->tcon;
 459         else
 460                 return -EIO;
 461
 462         xid = GetXid();
 463         if (pTcon) {
 464                 cFYI(1, "set type: 0x%x id: %d", quota_type, qid);
 465         } else
 466                 rc = -EIO;
 467
 468         FreeXid(xid);
 469         return rc;
 470 }
 471
 472 int cifs_xstate_set(struct super_block *sb, unsigned int flags, int operation)
 473 {
 474         int xid;
 475         int rc = 0;
 476         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 477         struct cifsTconInfo *pTcon;
 478
 479         if (cifs_sb)
 480                 pTcon = cifs_sb->tcon;
 481         else
 482                 return -EIO;
 483
 484         xid = GetXid();
 485         if (pTcon) {
 486                 cFYI(1, "flags: 0x%x operation: 0x%x", flags, operation);
 487         } else
 488                 rc = -EIO;
 489
 490         FreeXid(xid);
 491         return rc;
 492 }
 493
 494 int cifs_xstate_get(struct super_block *sb, struct fs_quota_stat *qstats)
 495 {
 496         int xid;
 497         int rc = 0;
 498         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 499         struct cifsTconInfo *pTcon;
 500
 501         if (cifs_sb)
 502                 pTcon = cifs_sb->tcon;
 503         else
 504                 return -EIO;
 505
 506         xid = GetXid();
 507         if (pTcon) {
 508                 cFYI(1, "pqstats %p", qstats);
 509         } else
 510                 rc = -EIO;
 511
 512         FreeXid(xid);
 513         return rc;
 514 }
 515
 516 static const struct quotactl_ops cifs_quotactl_ops = {
 517         .set_xquota     = cifs_xquota_set,
 518         .get_xquota     = cifs_xquota_get,
 519         .set_xstate     = cifs_xstate_set,
 520         .get_xstate     = cifs_xstate_get,
 521 };
 522 #endif
 523
 524 static void cifs_umount_begin(struct super_block *sb)
 525 {
 526         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 527         struct cifsTconInfo *tcon;
 528
 529         if (cifs_sb == NULL)
 530                 return;
 531
 532         tcon = cifs_sb->tcon;
 533         if (tcon == NULL)
 534                 return;
 535
 536         read_lock(&cifs_tcp_ses_lock);
 537         if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
 538                 /* we have other mounts to same share or we have
 539                    already tried to force umount this and woken up
 540                    all waiting network requests, nothing to do */
 541                 read_unlock(&cifs_tcp_ses_lock);
 542                 return;
 543         } else if (tcon->tc_count == 1)
 544                 tcon->tidStatus = CifsExiting;
 545         read_unlock(&cifs_tcp_ses_lock);
 546
 547         /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
 548         /* cancel_notify_requests(tcon); */
 549         if (tcon->ses && tcon->ses->server) {
 550                 cFYI(1, "wake up tasks now - umount begin not complete");
 551                 wake_up_all(&tcon->ses->server->request_q);
 552                 wake_up_all(&tcon->ses->server->response_q);
 553                 msleep(1); /* yield */
 554                 /* we have to kick the requests once more */
 555                 wake_up_all(&tcon->ses->server->response_q);
 556                 msleep(1);
 557         }
 558
 559         return;
 560 }
 561
 562 #ifdef CONFIG_CIFS_STATS2
 563 static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt)
 564 {
 565         /* BB FIXME */
 566         return 0;
 567 }
 568 #endif
 569
 570 static int cifs_remount(struct super_block *sb, int *flags, char *data)
 571 {
 572         *flags |= MS_NODIRATIME;
 573         return 0;
 574 }
 575
 576 static const struct super_operations cifs_super_ops = {
 577         .put_super = cifs_put_super,
 578         .statfs = cifs_statfs,
 579         .alloc_inode = cifs_alloc_inode,
 580         .destroy_inode = cifs_destroy_inode,
 581 /*      .drop_inode         = generic_delete_inode,
 582         .delete_inode   = cifs_delete_inode,  */  /* Do not need above two
 583         functions unless later we add lazy close of inodes or unless the
 584         kernel forgets to call us with the same number of releases (closes)
 585         as opens */
 586         .show_options = cifs_show_options,
 587         .umount_begin   = cifs_umount_begin,
 588         .remount_fs = cifs_remount,
 589 #ifdef CONFIG_CIFS_STATS2
 590         .show_stats = cifs_show_stats,
 591 #endif
 592 };
 593
 594 static int
 595 cifs_get_sb(struct file_system_type *fs_type,
 596             int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 597 {
 598         int rc;
 599         struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);
 600
 601         cFYI(1, "Devname: %s flags: %d ", dev_name, flags);
 602
 603         if (IS_ERR(sb))
 604                 return PTR_ERR(sb);
 605
 606         sb->s_flags = flags;
 607
 608         rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
 609         if (rc) {
 610                 deactivate_locked_super(sb);
 611                 return rc;
 612         }
 613         sb->s_flags |= MS_ACTIVE;
 614         simple_set_mnt(mnt, sb);
 615         return 0;
 616 }
 617
 618 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 619                                    unsigned long nr_segs, loff_t pos)
 620 {
 621         struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
 622         ssize_t written;
 623
 624         written = generic_file_aio_write(iocb, iov, nr_segs, pos);
 625         if (!CIFS_I(inode)->clientCanCacheAll)
 626                 filemap_fdatawrite(inode->i_mapping);
 627         return written;
 628 }
 629
 630 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
 631 {
 632         /* origin == SEEK_END => we must revalidate the cached file length */
 633         if (origin == SEEK_END) {
 634                 int retval;
 635
 636                 /* some applications poll for the file length in this strange
 637                    way so we must seek to end on non-oplocked files by
 638                    setting the revalidate time to zero */
 639                 CIFS_I(file->f_path.dentry->d_inode)->time = 0;
 640
 641                 retval = cifs_revalidate_file(file);
 642                 if (retval < 0)
 643                         return (loff_t)retval;
 644         }
 645         return generic_file_llseek_unlocked(file, offset, origin);
 646 }
 647
 648 static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
 649 {
 650         /* note that this is called by vfs setlease with the BKL held
 651            although I doubt that BKL is needed here in cifs */
 652         struct inode *inode = file->f_path.dentry->d_inode;
 653
 654         if (!(S_ISREG(inode->i_mode)))
 655                 return -EINVAL;
 656
 657         /* check if file is oplocked */
 658         if (((arg == F_RDLCK) &&
 659                 (CIFS_I(inode)->clientCanCacheRead)) ||
 660             ((arg == F_WRLCK) &&
 661                 (CIFS_I(inode)->clientCanCacheAll)))
 662                 return generic_setlease(file, arg, lease);
 663         else if (CIFS_SB(inode->i_sb)->tcon->local_lease &&
 664                         !CIFS_I(inode)->clientCanCacheRead)
 665                 /* If the server claims to support oplock on this
 666                    file, then we still need to check oplock even
 667                    if the local_lease mount option is set, but there
 668                    are servers which do not support oplock for which
 669                    this mount option may be useful if the user
 670                    knows that the file won't be changed on the server
 671                    by anyone else */
 672                 return generic_setlease(file, arg, lease);
 673         else
 674                 return -EAGAIN;
 675 }
 676
 677 struct file_system_type cifs_fs_type = {
 678         .owner = THIS_MODULE,
 679         .name = "cifs",
 680         .get_sb = cifs_get_sb,
 681         .kill_sb = kill_anon_super,
 682         /*  .fs_flags */
 683 };
 684 const struct inode_operations cifs_dir_inode_ops = {
 685         .create = cifs_create,
 686         .lookup = cifs_lookup,
 687         .getattr = cifs_getattr,
 688         .unlink = cifs_unlink,
 689         .link = cifs_hardlink,
 690         .mkdir = cifs_mkdir,
 691         .rmdir = cifs_rmdir,
 692         .rename = cifs_rename,
 693         .permission = cifs_permission,
 694 /*      revalidate:cifs_revalidate,   */
 695         .setattr = cifs_setattr,
 696         .symlink = cifs_symlink,
 697         .mknod   = cifs_mknod,
 698 #ifdef CONFIG_CIFS_XATTR
 699         .setxattr = cifs_setxattr,
 700         .getxattr = cifs_getxattr,
 701         .listxattr = cifs_listxattr,
 702         .removexattr = cifs_removexattr,
 703 #endif
 704 };
 705
 706 const struct inode_operations cifs_file_inode_ops = {
 707 /*      revalidate:cifs_revalidate, */
 708         .setattr = cifs_setattr,
 709         .getattr = cifs_getattr, /* do we need this anymore? */
 710         .rename = cifs_rename,
 711         .permission = cifs_permission,
 712 #ifdef CONFIG_CIFS_XATTR
 713         .setxattr = cifs_setxattr,
 714         .getxattr = cifs_getxattr,
 715         .listxattr = cifs_listxattr,
 716         .removexattr = cifs_removexattr,
 717 #endif
 718 };
 719
 720 const struct inode_operations cifs_symlink_inode_ops = {
 721         .readlink = generic_readlink,
 722         .follow_link = cifs_follow_link,
 723         .put_link = cifs_put_link,
 724         .permission = cifs_permission,
 725         /* BB add the following two eventually */
 726         /* revalidate: cifs_revalidate,
 727            setattr:    cifs_notify_change, *//* BB do we need notify change */
 728 #ifdef CONFIG_CIFS_XATTR
 729         .setxattr = cifs_setxattr,
 730         .getxattr = cifs_getxattr,
 731         .listxattr = cifs_listxattr,
 732         .removexattr = cifs_removexattr,
 733 #endif
 734 };
 735
 736 const struct file_operations cifs_file_ops = {
 737         .read = do_sync_read,
 738         .write = do_sync_write,
 739         .aio_read = generic_file_aio_read,
 740         .aio_write = cifs_file_aio_write,
 741         .open = cifs_open,
 742         .release = cifs_close,
 743         .lock = cifs_lock,
 744         .fsync = cifs_fsync,
 745         .flush = cifs_flush,
 746         .mmap  = cifs_file_mmap,
 747         .splice_read = generic_file_splice_read,
 748         .llseek = cifs_llseek,
 749 #ifdef CONFIG_CIFS_POSIX
 750         .unlocked_ioctl = cifs_ioctl,
 751 #endif /* CONFIG_CIFS_POSIX */
 752         .setlease = cifs_setlease,
 753 };
 754
 755 const struct file_operations cifs_file_direct_ops = {
 756         /* no aio, no readv -
 757            BB reevaluate whether they can be done with directio, no cache */
 758         .read = cifs_user_read,
 759         .write = cifs_user_write,
 760         .open = cifs_open,
 761         .release = cifs_close,
 762         .lock = cifs_lock,
 763         .fsync = cifs_fsync,
 764         .flush = cifs_flush,
 765         .mmap = cifs_file_mmap,
 766         .splice_read = generic_file_splice_read,
 767 #ifdef CONFIG_CIFS_POSIX
 768         .unlocked_ioctl  = cifs_ioctl,
 769 #endif /* CONFIG_CIFS_POSIX */
 770         .llseek = cifs_llseek,
 771         .setlease = cifs_setlease,
 772 };
 773 const struct file_operations cifs_file_nobrl_ops = {
 774         .read = do_sync_read,
 775         .write = do_sync_write,
 776         .aio_read = generic_file_aio_read,
 777         .aio_write = cifs_file_aio_write,
 778         .open = cifs_open,
 779         .release = cifs_close,
 780         .fsync = cifs_fsync,
 781         .flush = cifs_flush,
 782         .mmap  = cifs_file_mmap,
 783         .splice_read = generic_file_splice_read,
 784         .llseek = cifs_llseek,
 785 #ifdef CONFIG_CIFS_POSIX
 786         .unlocked_ioctl = cifs_ioctl,
 787 #endif /* CONFIG_CIFS_POSIX */
 788         .setlease = cifs_setlease,
 789 };
 790
 791 const struct file_operations cifs_file_direct_nobrl_ops = {
 792         /* no mmap, no aio, no readv -
 793            BB reevaluate whether they can be done with directio, no cache */
 794         .read = cifs_user_read,
 795         .write = cifs_user_write,
 796         .open = cifs_open,
 797         .release = cifs_close,
 798         .fsync = cifs_fsync,
 799         .flush = cifs_flush,
 800         .mmap = cifs_file_mmap,
 801         .splice_read = generic_file_splice_read,
 802 #ifdef CONFIG_CIFS_POSIX
 803         .unlocked_ioctl  = cifs_ioctl,
 804 #endif /* CONFIG_CIFS_POSIX */
 805         .llseek = cifs_llseek,
 806         .setlease = cifs_setlease,
 807 };
 808
 809 const struct file_operations cifs_dir_ops = {
 810         .readdir = cifs_readdir,
 811         .release = cifs_closedir,
 812         .read    = generic_read_dir,
 813         .unlocked_ioctl  = cifs_ioctl,
 814         .llseek = generic_file_llseek,
 815 };
 816
 817 static void
 818 cifs_init_once(void *inode)
 819 {
 820         struct cifsInodeInfo *cifsi = inode;
 821
 822         inode_init_once(&cifsi->vfs_inode);
 823         INIT_LIST_HEAD(&cifsi->lockList);
 824 }
 825
 826 static int
 827 cifs_init_inodecache(void)
 828 {
 829         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
 830                                               sizeof(struct cifsInodeInfo),
 831                                               0, (SLAB_RECLAIM_ACCOUNT|
 832                                                 SLAB_MEM_SPREAD),
 833                                               cifs_init_once);
 834         if (cifs_inode_cachep == NULL)
 835                 return -ENOMEM;
 836
 837         return 0;
 838 }
 839
 840 static void
 841 cifs_destroy_inodecache(void)
 842 {
 843         kmem_cache_destroy(cifs_inode_cachep);
 844 }
 845
 846 static int
 847 cifs_init_request_bufs(void)
 848 {
 849         if (CIFSMaxBufSize < 8192) {
 850         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
 851         Unicode path name has to fit in any SMB/CIFS path based frames */
 852                 CIFSMaxBufSize = 8192;
 853         } else if (CIFSMaxBufSize > 1024*127) {
 854                 CIFSMaxBufSize = 1024 * 127;
 855         } else {
 856                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
 857         }
 858 /*      cERROR(1, "CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize); */
 859         cifs_req_cachep = kmem_cache_create("cifs_request",
 860                                             CIFSMaxBufSize +
 861                                             MAX_CIFS_HDR_SIZE, 0,
 862                                             SLAB_HWCACHE_ALIGN, NULL);
 863         if (cifs_req_cachep == NULL)
 864                 return -ENOMEM;
 865
 866         if (cifs_min_rcv < 1)
 867                 cifs_min_rcv = 1;
 868         else if (cifs_min_rcv > 64) {
 869                 cifs_min_rcv = 64;
 870                 cERROR(1, "cifs_min_rcv set to maximum (64)");
 871         }
 872
 873         cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
 874                                                   cifs_req_cachep);
 875
 876         if (cifs_req_poolp == NULL) {
 877                 kmem_cache_destroy(cifs_req_cachep);
 878                 return -ENOMEM;
 879         }
 880         /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
 881         almost all handle based requests (but not write response, nor is it
 882         sufficient for path based requests).  A smaller size would have
 883         been more efficient (compacting multiple slab items on one 4k page)
 884         for the case in which debug was on, but this larger size allows
 885         more SMBs to use small buffer alloc and is still much more
 886         efficient to alloc 1 per page off the slab compared to 17K (5page)
 887         alloc of large cifs buffers even when page debugging is on */
 888         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
 889                         MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
 890                         NULL);
 891         if (cifs_sm_req_cachep == NULL) {
 892                 mempool_destroy(cifs_req_poolp);
 893                 kmem_cache_destroy(cifs_req_cachep);
 894                 return -ENOMEM;
 895         }
 896
 897         if (cifs_min_small < 2)
 898                 cifs_min_small = 2;
 899         else if (cifs_min_small > 256) {
 900                 cifs_min_small = 256;
 901                 cFYI(1, "cifs_min_small set to maximum (256)");
 902         }
 903
 904         cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
 905                                                      cifs_sm_req_cachep);
 906
 907         if (cifs_sm_req_poolp == NULL) {
 908                 mempool_destroy(cifs_req_poolp);
 909                 kmem_cache_destroy(cifs_req_cachep);
 910                 kmem_cache_destroy(cifs_sm_req_cachep);
 911                 return -ENOMEM;
 912         }
 913
 914         return 0;
 915 }
 916
 917 static void
 918 cifs_destroy_request_bufs(void)
 919 {
 920         mempool_destroy(cifs_req_poolp);
 921         kmem_cache_destroy(cifs_req_cachep);
 922         mempool_destroy(cifs_sm_req_poolp);
 923         kmem_cache_destroy(cifs_sm_req_cachep);
 924 }
 925
 926 static int
 927 cifs_init_mids(void)
 928 {
 929         cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
 930                                             sizeof(struct mid_q_entry), 0,
 931                                             SLAB_HWCACHE_ALIGN, NULL);
 932         if (cifs_mid_cachep == NULL)
 933                 return -ENOMEM;
 934
 935         /* 3 is a reasonable minimum number of simultaneous operations */
 936         cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
 937         if (cifs_mid_poolp == NULL) {
 938                 kmem_cache_destroy(cifs_mid_cachep);
 939                 return -ENOMEM;
 940         }
 941
 942         cifs_oplock_cachep = kmem_cache_create("cifs_oplock_structs",
 943                                         sizeof(struct oplock_q_entry), 0,
 944                                         SLAB_HWCACHE_ALIGN, NULL);
 945         if (cifs_oplock_cachep == NULL) {
 946                 mempool_destroy(cifs_mid_poolp);
 947                 kmem_cache_destroy(cifs_mid_cachep);
 948                 return -ENOMEM;
 949         }
 950
 951         return 0;
 952 }
 953
 954 static void
 955 cifs_destroy_mids(void)
 956 {
 957         mempool_destroy(cifs_mid_poolp);
 958         kmem_cache_destroy(cifs_mid_cachep);
 959         kmem_cache_destroy(cifs_oplock_cachep);
 960 }
 961
 962 static int __init
 963 init_cifs(void)
 964 {
 965         int rc = 0;
 966         cifs_proc_init();
 967         INIT_LIST_HEAD(&cifs_tcp_ses_list);
 968 #ifdef CONFIG_CIFS_EXPERIMENTAL
 969         INIT_LIST_HEAD(&GlobalDnotifyReqList);
 970         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
 971 #endif
 972 /*
 973  *  Initialize Global counters
 974  */
 975         atomic_set(&sesInfoAllocCount, 0);
 976         atomic_set(&tconInfoAllocCount, 0);
 977         atomic_set(&tcpSesAllocCount, 0);
 978         atomic_set(&tcpSesReconnectCount, 0);
 979         atomic_set(&tconInfoReconnectCount, 0);
 980
 981         atomic_set(&bufAllocCount, 0);
 982         atomic_set(&smBufAllocCount, 0);
 983 #ifdef CONFIG_CIFS_STATS2
 984         atomic_set(&totBufAllocCount, 0);
 985         atomic_set(&totSmBufAllocCount, 0);
 986 #endif /* CONFIG_CIFS_STATS2 */
 987
 988         atomic_set(&midCount, 0);
 989         GlobalCurrentXid = 0;
 990         GlobalTotalActiveXid = 0;
 991         GlobalMaxActiveXid = 0;
 992         memset(Local_System_Name, 0, 15);
 993         rwlock_init(&GlobalSMBSeslock);
 994         rwlock_init(&cifs_tcp_ses_lock);
 995         spin_lock_init(&GlobalMid_Lock);
 996
 997         if (cifs_max_pending < 2) {
 998                 cifs_max_pending = 2;
 999                 cFYI(1, "cifs_max_pending set to min of 2");
1000         } else if (cifs_max_pending > 256) {
1001                 cifs_max_pending = 256;
1002                 cFYI(1, "cifs_max_pending set to max of 256");
1003         }
1004
1005         rc = cifs_init_inodecache();
1006         if (rc)
1007                 goto out_clean_proc;
1008
1009         rc = cifs_init_mids();
1010         if (rc)
1011                 goto out_destroy_inodecache;
1012
1013         rc = cifs_init_request_bufs();
1014         if (rc)
1015                 goto out_destroy_mids;
1016
1017         rc = register_filesystem(&cifs_fs_type);
1018         if (rc)
1019                 goto out_destroy_request_bufs;
1020 #ifdef CONFIG_CIFS_UPCALL
1021         rc = register_key_type(&cifs_spnego_key_type);
1022         if (rc)
1023                 goto out_unregister_filesystem;
1024 #endif
1025 #ifdef CONFIG_CIFS_DFS_UPCALL
1026         rc = register_key_type(&key_type_dns_resolver);
1027         if (rc)
1028                 goto out_unregister_key_type;
1029 #endif
1030         rc = slow_work_register_user(THIS_MODULE);
1031         if (rc)
1032                 goto out_unregister_resolver_key;
1033
1034         return 0;
1035
1036  out_unregister_resolver_key:
1037 #ifdef CONFIG_CIFS_DFS_UPCALL
1038         unregister_key_type(&key_type_dns_resolver);
1039  out_unregister_key_type:
1040 #endif
1041 #ifdef CONFIG_CIFS_UPCALL
1042         unregister_key_type(&cifs_spnego_key_type);
1043  out_unregister_filesystem:
1044 #endif
1045         unregister_filesystem(&cifs_fs_type);
1046  out_destroy_request_bufs:
1047         cifs_destroy_request_bufs();
1048  out_destroy_mids:
1049         cifs_destroy_mids();
1050  out_destroy_inodecache:
1051         cifs_destroy_inodecache();
1052  out_clean_proc:
1053         cifs_proc_clean();
1054         return rc;
1055 }
1056
1057 static void __exit
1058 exit_cifs(void)
1059 {
1060         cFYI(DBG2, "exit_cifs");
1061         cifs_proc_clean();
1062 #ifdef CONFIG_CIFS_DFS_UPCALL
1063         cifs_dfs_release_automount_timer();
1064         unregister_key_type(&key_type_dns_resolver);
1065 #endif
1066 #ifdef CONFIG_CIFS_UPCALL
1067         unregister_key_type(&cifs_spnego_key_type);
1068 #endif
1069         unregister_filesystem(&cifs_fs_type);
1070         cifs_destroy_inodecache();
1071         cifs_destroy_mids();
1072         cifs_destroy_request_bufs();
1073 }
1074
1075 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1076 MODULE_LICENSE("GPL");  /* combination of LGPL + GPL source behaves as GPL */
1077 MODULE_DESCRIPTION
1078     ("VFS to access servers complying with the SNIA CIFS Specification "
1079      "e.g. Samba and Windows");
1080 MODULE_VERSION(CIFS_VERSION);
1081 module_init(init_cifs)
1082 module_exit(exit_cifs)