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->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->f_path.dentry);
 642                 if (retval < 0)
 643                         return (loff_t)retval;
 644         }
 645         return generic_file_llseek_unlocked(file, offset, origin);
 646 }
 647
 648 #ifdef CONFIG_CIFS_EXPERIMENTAL
 649 static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
 650 {
 651         /* note that this is called by vfs setlease with the BKL held
 652            although I doubt that BKL is needed here in cifs */
 653         struct inode *inode = file->f_path.dentry->d_inode;
 654
 655         if (!(S_ISREG(inode->i_mode)))
 656                 return -EINVAL;
 657
 658         /* check if file is oplocked */
 659         if (((arg == F_RDLCK) &&
 660                 (CIFS_I(inode)->clientCanCacheRead)) ||
 661             ((arg == F_WRLCK) &&
 662                 (CIFS_I(inode)->clientCanCacheAll)))
 663                 return generic_setlease(file, arg, lease);
 664         else if (CIFS_SB(inode->i_sb)->tcon->local_lease &&
 665                         !CIFS_I(inode)->clientCanCacheRead)
 666                 /* If the server claims to support oplock on this
 667                    file, then we still need to check oplock even
 668                    if the local_lease mount option is set, but there
 669                    are servers which do not support oplock for which
 670                    this mount option may be useful if the user
 671                    knows that the file won't be changed on the server
 672                    by anyone else */
 673                 return generic_setlease(file, arg, lease);
 674         else
 675                 return -EAGAIN;
 676 }
 677 #endif
 678
 679 struct file_system_type cifs_fs_type = {
 680         .owner = THIS_MODULE,
 681         .name = "cifs",
 682         .get_sb = cifs_get_sb,
 683         .kill_sb = kill_anon_super,
 684         /*  .fs_flags */
 685 };
 686 const struct inode_operations cifs_dir_inode_ops = {
 687         .create = cifs_create,
 688         .lookup = cifs_lookup,
 689         .getattr = cifs_getattr,
 690         .unlink = cifs_unlink,
 691         .link = cifs_hardlink,
 692         .mkdir = cifs_mkdir,
 693         .rmdir = cifs_rmdir,
 694         .rename = cifs_rename,
 695         .permission = cifs_permission,
 696 /*      revalidate:cifs_revalidate,   */
 697         .setattr = cifs_setattr,
 698         .symlink = cifs_symlink,
 699         .mknod   = cifs_mknod,
 700 #ifdef CONFIG_CIFS_XATTR
 701         .setxattr = cifs_setxattr,
 702         .getxattr = cifs_getxattr,
 703         .listxattr = cifs_listxattr,
 704         .removexattr = cifs_removexattr,
 705 #endif
 706 };
 707
 708 const struct inode_operations cifs_file_inode_ops = {
 709 /*      revalidate:cifs_revalidate, */
 710         .setattr = cifs_setattr,
 711         .getattr = cifs_getattr, /* do we need this anymore? */
 712         .rename = cifs_rename,
 713         .permission = cifs_permission,
 714 #ifdef CONFIG_CIFS_XATTR
 715         .setxattr = cifs_setxattr,
 716         .getxattr = cifs_getxattr,
 717         .listxattr = cifs_listxattr,
 718         .removexattr = cifs_removexattr,
 719 #endif
 720 };
 721
 722 const struct inode_operations cifs_symlink_inode_ops = {
 723         .readlink = generic_readlink,
 724         .follow_link = cifs_follow_link,
 725         .put_link = cifs_put_link,
 726         .permission = cifs_permission,
 727         /* BB add the following two eventually */
 728         /* revalidate: cifs_revalidate,
 729            setattr:    cifs_notify_change, *//* BB do we need notify change */
 730 #ifdef CONFIG_CIFS_XATTR
 731         .setxattr = cifs_setxattr,
 732         .getxattr = cifs_getxattr,
 733         .listxattr = cifs_listxattr,
 734         .removexattr = cifs_removexattr,
 735 #endif
 736 };
 737
 738 const struct file_operations cifs_file_ops = {
 739         .read = do_sync_read,
 740         .write = do_sync_write,
 741         .aio_read = generic_file_aio_read,
 742         .aio_write = cifs_file_aio_write,
 743         .open = cifs_open,
 744         .release = cifs_close,
 745         .lock = cifs_lock,
 746         .fsync = cifs_fsync,
 747         .flush = cifs_flush,
 748         .mmap  = cifs_file_mmap,
 749         .splice_read = generic_file_splice_read,
 750         .llseek = cifs_llseek,
 751 #ifdef CONFIG_CIFS_POSIX
 752         .unlocked_ioctl = cifs_ioctl,
 753 #endif /* CONFIG_CIFS_POSIX */
 754
 755 #ifdef CONFIG_CIFS_EXPERIMENTAL
 756         .setlease = cifs_setlease,
 757 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 758 };
 759
 760 const struct file_operations cifs_file_direct_ops = {
 761         /* no aio, no readv -
 762            BB reevaluate whether they can be done with directio, no cache */
 763         .read = cifs_user_read,
 764         .write = cifs_user_write,
 765         .open = cifs_open,
 766         .release = cifs_close,
 767         .lock = cifs_lock,
 768         .fsync = cifs_fsync,
 769         .flush = cifs_flush,
 770         .mmap = cifs_file_mmap,
 771         .splice_read = generic_file_splice_read,
 772 #ifdef CONFIG_CIFS_POSIX
 773         .unlocked_ioctl  = cifs_ioctl,
 774 #endif /* CONFIG_CIFS_POSIX */
 775         .llseek = cifs_llseek,
 776 #ifdef CONFIG_CIFS_EXPERIMENTAL
 777         .setlease = cifs_setlease,
 778 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 779 };
 780 const struct file_operations cifs_file_nobrl_ops = {
 781         .read = do_sync_read,
 782         .write = do_sync_write,
 783         .aio_read = generic_file_aio_read,
 784         .aio_write = cifs_file_aio_write,
 785         .open = cifs_open,
 786         .release = cifs_close,
 787         .fsync = cifs_fsync,
 788         .flush = cifs_flush,
 789         .mmap  = cifs_file_mmap,
 790         .splice_read = generic_file_splice_read,
 791         .llseek = cifs_llseek,
 792 #ifdef CONFIG_CIFS_POSIX
 793         .unlocked_ioctl = cifs_ioctl,
 794 #endif /* CONFIG_CIFS_POSIX */
 795
 796 #ifdef CONFIG_CIFS_EXPERIMENTAL
 797         .setlease = cifs_setlease,
 798 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 799 };
 800
 801 const struct file_operations cifs_file_direct_nobrl_ops = {
 802         /* no mmap, no aio, no readv -
 803            BB reevaluate whether they can be done with directio, no cache */
 804         .read = cifs_user_read,
 805         .write = cifs_user_write,
 806         .open = cifs_open,
 807         .release = cifs_close,
 808         .fsync = cifs_fsync,
 809         .flush = cifs_flush,
 810         .splice_read = generic_file_splice_read,
 811 #ifdef CONFIG_CIFS_POSIX
 812         .unlocked_ioctl  = cifs_ioctl,
 813 #endif /* CONFIG_CIFS_POSIX */
 814         .llseek = cifs_llseek,
 815 #ifdef CONFIG_CIFS_EXPERIMENTAL
 816         .setlease = cifs_setlease,
 817 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 818 };
 819
 820 const struct file_operations cifs_dir_ops = {
 821         .readdir = cifs_readdir,
 822         .release = cifs_closedir,
 823         .read    = generic_read_dir,
 824         .unlocked_ioctl  = cifs_ioctl,
 825         .llseek = generic_file_llseek,
 826 };
 827
 828 static void
 829 cifs_init_once(void *inode)
 830 {
 831         struct cifsInodeInfo *cifsi = inode;
 832
 833         inode_init_once(&cifsi->vfs_inode);
 834         INIT_LIST_HEAD(&cifsi->lockList);
 835 }
 836
 837 static int
 838 cifs_init_inodecache(void)
 839 {
 840         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
 841                                               sizeof(struct cifsInodeInfo),
 842                                               0, (SLAB_RECLAIM_ACCOUNT|
 843                                                 SLAB_MEM_SPREAD),
 844                                               cifs_init_once);
 845         if (cifs_inode_cachep == NULL)
 846                 return -ENOMEM;
 847
 848         return 0;
 849 }
 850
 851 static void
 852 cifs_destroy_inodecache(void)
 853 {
 854         kmem_cache_destroy(cifs_inode_cachep);
 855 }
 856
 857 static int
 858 cifs_init_request_bufs(void)
 859 {
 860         if (CIFSMaxBufSize < 8192) {
 861         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
 862         Unicode path name has to fit in any SMB/CIFS path based frames */
 863                 CIFSMaxBufSize = 8192;
 864         } else if (CIFSMaxBufSize > 1024*127) {
 865                 CIFSMaxBufSize = 1024 * 127;
 866         } else {
 867                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
 868         }
 869 /*      cERROR(1,("CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize)); */
 870         cifs_req_cachep = kmem_cache_create("cifs_request",
 871                                             CIFSMaxBufSize +
 872                                             MAX_CIFS_HDR_SIZE, 0,
 873                                             SLAB_HWCACHE_ALIGN, NULL);
 874         if (cifs_req_cachep == NULL)
 875                 return -ENOMEM;
 876
 877         if (cifs_min_rcv < 1)
 878                 cifs_min_rcv = 1;
 879         else if (cifs_min_rcv > 64) {
 880                 cifs_min_rcv = 64;
 881                 cERROR(1, ("cifs_min_rcv set to maximum (64)"));
 882         }
 883
 884         cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
 885                                                   cifs_req_cachep);
 886
 887         if (cifs_req_poolp == NULL) {
 888                 kmem_cache_destroy(cifs_req_cachep);
 889                 return -ENOMEM;
 890         }
 891         /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
 892         almost all handle based requests (but not write response, nor is it
 893         sufficient for path based requests).  A smaller size would have
 894         been more efficient (compacting multiple slab items on one 4k page)
 895         for the case in which debug was on, but this larger size allows
 896         more SMBs to use small buffer alloc and is still much more
 897         efficient to alloc 1 per page off the slab compared to 17K (5page)
 898         alloc of large cifs buffers even when page debugging is on */
 899         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
 900                         MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
 901                         NULL);
 902         if (cifs_sm_req_cachep == NULL) {
 903                 mempool_destroy(cifs_req_poolp);
 904                 kmem_cache_destroy(cifs_req_cachep);
 905                 return -ENOMEM;
 906         }
 907
 908         if (cifs_min_small < 2)
 909                 cifs_min_small = 2;
 910         else if (cifs_min_small > 256) {
 911                 cifs_min_small = 256;
 912                 cFYI(1, ("cifs_min_small set to maximum (256)"));
 913         }
 914
 915         cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
 916                                                      cifs_sm_req_cachep);
 917
 918         if (cifs_sm_req_poolp == NULL) {
 919                 mempool_destroy(cifs_req_poolp);
 920                 kmem_cache_destroy(cifs_req_cachep);
 921                 kmem_cache_destroy(cifs_sm_req_cachep);
 922                 return -ENOMEM;
 923         }
 924
 925         return 0;
 926 }
 927
 928 static void
 929 cifs_destroy_request_bufs(void)
 930 {
 931         mempool_destroy(cifs_req_poolp);
 932         kmem_cache_destroy(cifs_req_cachep);
 933         mempool_destroy(cifs_sm_req_poolp);
 934         kmem_cache_destroy(cifs_sm_req_cachep);
 935 }
 936
 937 static int
 938 cifs_init_mids(void)
 939 {
 940         cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
 941                                             sizeof(struct mid_q_entry), 0,
 942                                             SLAB_HWCACHE_ALIGN, NULL);
 943         if (cifs_mid_cachep == NULL)
 944                 return -ENOMEM;
 945
 946         /* 3 is a reasonable minimum number of simultaneous operations */
 947         cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
 948         if (cifs_mid_poolp == NULL) {
 949                 kmem_cache_destroy(cifs_mid_cachep);
 950                 return -ENOMEM;
 951         }
 952
 953         cifs_oplock_cachep = kmem_cache_create("cifs_oplock_structs",
 954                                         sizeof(struct oplock_q_entry), 0,
 955                                         SLAB_HWCACHE_ALIGN, NULL);
 956         if (cifs_oplock_cachep == NULL) {
 957                 mempool_destroy(cifs_mid_poolp);
 958                 kmem_cache_destroy(cifs_mid_cachep);
 959                 return -ENOMEM;
 960         }
 961
 962         return 0;
 963 }
 964
 965 static void
 966 cifs_destroy_mids(void)
 967 {
 968         mempool_destroy(cifs_mid_poolp);
 969         kmem_cache_destroy(cifs_mid_cachep);
 970         kmem_cache_destroy(cifs_oplock_cachep);
 971 }
 972
 973 static int __init
 974 init_cifs(void)
 975 {
 976         int rc = 0;
 977         cifs_proc_init();
 978         INIT_LIST_HEAD(&cifs_tcp_ses_list);
 979 #ifdef CONFIG_CIFS_EXPERIMENTAL
 980         INIT_LIST_HEAD(&GlobalDnotifyReqList);
 981         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
 982 #endif
 983 /*
 984  *  Initialize Global counters
 985  */
 986         atomic_set(&sesInfoAllocCount, 0);
 987         atomic_set(&tconInfoAllocCount, 0);
 988         atomic_set(&tcpSesAllocCount, 0);
 989         atomic_set(&tcpSesReconnectCount, 0);
 990         atomic_set(&tconInfoReconnectCount, 0);
 991
 992         atomic_set(&bufAllocCount, 0);
 993         atomic_set(&smBufAllocCount, 0);
 994 #ifdef CONFIG_CIFS_STATS2
 995         atomic_set(&totBufAllocCount, 0);
 996         atomic_set(&totSmBufAllocCount, 0);
 997 #endif /* CONFIG_CIFS_STATS2 */
 998
 999         atomic_set(&midCount, 0);
1000         GlobalCurrentXid = 0;
1001         GlobalTotalActiveXid = 0;
1002         GlobalMaxActiveXid = 0;
1003         memset(Local_System_Name, 0, 15);
1004         rwlock_init(&GlobalSMBSeslock);
1005         rwlock_init(&cifs_tcp_ses_lock);
1006         spin_lock_init(&GlobalMid_Lock);
1007
1008         if (cifs_max_pending < 2) {
1009                 cifs_max_pending = 2;
1010                 cFYI(1, ("cifs_max_pending set to min of 2"));
1011         } else if (cifs_max_pending > 256) {
1012                 cifs_max_pending = 256;
1013                 cFYI(1, ("cifs_max_pending set to max of 256"));
1014         }
1015
1016         rc = cifs_init_inodecache();
1017         if (rc)
1018                 goto out_clean_proc;
1019
1020         rc = cifs_init_mids();
1021         if (rc)
1022                 goto out_destroy_inodecache;
1023
1024         rc = cifs_init_request_bufs();
1025         if (rc)
1026                 goto out_destroy_mids;
1027
1028         rc = register_filesystem(&cifs_fs_type);
1029         if (rc)
1030                 goto out_destroy_request_bufs;
1031 #ifdef CONFIG_CIFS_UPCALL
1032         rc = register_key_type(&cifs_spnego_key_type);
1033         if (rc)
1034                 goto out_unregister_filesystem;
1035 #endif
1036 #ifdef CONFIG_CIFS_DFS_UPCALL
1037         rc = register_key_type(&key_type_dns_resolver);
1038         if (rc)
1039                 goto out_unregister_key_type;
1040 #endif
1041         rc = slow_work_register_user(THIS_MODULE);
1042         if (rc)
1043                 goto out_unregister_resolver_key;
1044
1045         return 0;
1046
1047  out_unregister_resolver_key:
1048 #ifdef CONFIG_CIFS_DFS_UPCALL
1049         unregister_key_type(&key_type_dns_resolver);
1050  out_unregister_key_type:
1051 #endif
1052 #ifdef CONFIG_CIFS_UPCALL
1053         unregister_key_type(&cifs_spnego_key_type);
1054  out_unregister_filesystem:
1055 #endif
1056         unregister_filesystem(&cifs_fs_type);
1057  out_destroy_request_bufs:
1058         cifs_destroy_request_bufs();
1059  out_destroy_mids:
1060         cifs_destroy_mids();
1061  out_destroy_inodecache:
1062         cifs_destroy_inodecache();
1063  out_clean_proc:
1064         cifs_proc_clean();
1065         return rc;
1066 }
1067
1068 static void __exit
1069 exit_cifs(void)
1070 {
1071         cFYI(DBG2, ("exit_cifs"));
1072         cifs_proc_clean();
1073 #ifdef CONFIG_CIFS_DFS_UPCALL
1074         cifs_dfs_release_automount_timer();
1075         unregister_key_type(&key_type_dns_resolver);
1076 #endif
1077 #ifdef CONFIG_CIFS_UPCALL
1078         unregister_key_type(&cifs_spnego_key_type);
1079 #endif
1080         unregister_filesystem(&cifs_fs_type);
1081         cifs_destroy_inodecache();
1082         cifs_destroy_mids();
1083         cifs_destroy_request_bufs();
1084 }
1085
1086 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1087 MODULE_LICENSE("GPL");  /* combination of LGPL + GPL source behaves as GPL */
1088 MODULE_DESCRIPTION
1089     ("VFS to access servers complying with the SNIA CIFS Specification "
1090      "e.g. Samba and Windows");
1091 MODULE_VERSION(CIFS_VERSION);
1092 module_init(init_cifs)
1093 module_exit(exit_cifs)