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 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 extern struct task_struct *oplockThread; /* remove sparse warning */
  68 struct task_struct *oplockThread = NULL;
  69 /* extern struct task_struct * dnotifyThread; remove sparse warning */
  70 static const struct super_operations cifs_super_ops;
  71 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
  72 module_param(CIFSMaxBufSize, int, 0);
  73 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header). "
  74                                  "Default: 16384 Range: 8192 to 130048");
  75 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
  76 module_param(cifs_min_rcv, int, 0);
  77 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
  78                                 "1 to 64");
  79 unsigned int cifs_min_small = 30;
  80 module_param(cifs_min_small, int, 0);
  81 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
  82                                  "Range: 2 to 256");
  83 unsigned int cifs_max_pending = CIFS_MAX_REQ;
  84 module_param(cifs_max_pending, int, 0);
  85 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. "
  86                                    "Default: 50 Range: 2 to 256");
  87
  88 extern mempool_t *cifs_sm_req_poolp;
  89 extern mempool_t *cifs_req_poolp;
  90 extern mempool_t *cifs_mid_poolp;
  91
  92 extern struct kmem_cache *cifs_oplock_cachep;
  93
  94 static int
  95 cifs_read_super(struct super_block *sb, void *data,
  96                 const char *devname, int silent)
  97 {
  98         struct inode *inode;
  99         struct cifs_sb_info *cifs_sb;
 100         int rc = 0;
 101
 102         /* BB should we make this contingent on mount parm? */
 103         sb->s_flags |= MS_NODIRATIME | MS_NOATIME;
 104         sb->s_fs_info = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
 105         cifs_sb = CIFS_SB(sb);
 106         if (cifs_sb == NULL)
 107                 return -ENOMEM;
 108
 109 #ifdef CONFIG_CIFS_DFS_UPCALL
 110         /* copy mount params to sb for use in submounts */
 111         /* BB: should we move this after the mount so we
 112          * do not have to do the copy on failed mounts?
 113          * BB: May be it is better to do simple copy before
 114          * complex operation (mount), and in case of fail
 115          * just exit instead of doing mount and attempting
 116          * undo it if this copy fails?*/
 117         if (data) {
 118                 int len = strlen(data);
 119                 cifs_sb->mountdata = kzalloc(len + 1, GFP_KERNEL);
 120                 if (cifs_sb->mountdata == NULL) {
 121                         kfree(sb->s_fs_info);
 122                         sb->s_fs_info = NULL;
 123                         return -ENOMEM;
 124                 }
 125                 strncpy(cifs_sb->mountdata, data, len + 1);
 126                 cifs_sb->mountdata[len] = '\0';
 127         }
 128 #endif
 129
 130         rc = cifs_mount(sb, cifs_sb, data, devname);
 131
 132         if (rc) {
 133                 if (!silent)
 134                         cERROR(1,
 135                                ("cifs_mount failed w/return code = %d", rc));
 136                 goto out_mount_failed;
 137         }
 138
 139         sb->s_magic = CIFS_MAGIC_NUMBER;
 140         sb->s_op = &cifs_super_ops;
 141 /*      if (cifs_sb->tcon->ses->server->maxBuf > MAX_CIFS_HDR_SIZE + 512)
 142             sb->s_blocksize =
 143                 cifs_sb->tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE; */
 144 #ifdef CONFIG_CIFS_QUOTA
 145         sb->s_qcop = &cifs_quotactl_ops;
 146 #endif
 147         sb->s_blocksize = CIFS_MAX_MSGSIZE;
 148         sb->s_blocksize_bits = 14;      /* default 2**14 = CIFS_MAX_MSGSIZE */
 149         inode = cifs_root_iget(sb, ROOT_I);
 150
 151         if (IS_ERR(inode)) {
 152                 rc = PTR_ERR(inode);
 153                 inode = NULL;
 154                 goto out_no_root;
 155         }
 156
 157         sb->s_root = d_alloc_root(inode);
 158
 159         if (!sb->s_root) {
 160                 rc = -ENOMEM;
 161                 goto out_no_root;
 162         }
 163
 164 #ifdef CONFIG_CIFS_EXPERIMENTAL
 165         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 166                 cFYI(1, ("export ops supported"));
 167                 sb->s_export_op = &cifs_export_ops;
 168         }
 169 #endif /* EXPERIMENTAL */
 170
 171         return 0;
 172
 173 out_no_root:
 174         cERROR(1, ("cifs_read_super: get root inode failed"));
 175         if (inode)
 176                 iput(inode);
 177
 178         cifs_umount(sb, cifs_sb);
 179
 180 out_mount_failed:
 181         if (cifs_sb) {
 182 #ifdef CONFIG_CIFS_DFS_UPCALL
 183                 if (cifs_sb->mountdata) {
 184                         kfree(cifs_sb->mountdata);
 185                         cifs_sb->mountdata = NULL;
 186                 }
 187 #endif
 188                 if (cifs_sb->local_nls)
 189                         unload_nls(cifs_sb->local_nls);
 190                 kfree(cifs_sb);
 191         }
 192         return rc;
 193 }
 194
 195 static void
 196 cifs_put_super(struct super_block *sb)
 197 {
 198         int rc = 0;
 199         struct cifs_sb_info *cifs_sb;
 200
 201         cFYI(1, ("In cifs_put_super"));
 202         cifs_sb = CIFS_SB(sb);
 203         if (cifs_sb == NULL) {
 204                 cFYI(1, ("Empty cifs superblock info passed to unmount"));
 205                 return;
 206         }
 207
 208         lock_kernel();
 209
 210         rc = cifs_umount(sb, cifs_sb);
 211         if (rc)
 212                 cERROR(1, ("cifs_umount failed with return code %d", rc));
 213 #ifdef CONFIG_CIFS_DFS_UPCALL
 214         if (cifs_sb->mountdata) {
 215                 kfree(cifs_sb->mountdata);
 216                 cifs_sb->mountdata = NULL;
 217         }
 218 #endif
 219
 220         unload_nls(cifs_sb->local_nls);
 221         kfree(cifs_sb);
 222
 223         unlock_kernel();
 224 }
 225
 226 static int
 227 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
 228 {
 229         struct super_block *sb = dentry->d_sb;
 230         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 231         struct cifsTconInfo *tcon = cifs_sb->tcon;
 232         int rc = -EOPNOTSUPP;
 233         int xid;
 234
 235         xid = GetXid();
 236
 237         buf->f_type = CIFS_MAGIC_NUMBER;
 238
 239         /*
 240          * PATH_MAX may be too long - it would presumably be total path,
 241          * but note that some servers (includinng Samba 3) have a shorter
 242          * maximum path.
 243          *
 244          * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
 245          */
 246         buf->f_namelen = PATH_MAX;
 247         buf->f_files = 0;       /* undefined */
 248         buf->f_ffree = 0;       /* unlimited */
 249
 250         /*
 251          * We could add a second check for a QFS Unix capability bit
 252          */
 253         if ((tcon->ses->capabilities & CAP_UNIX) &&
 254             (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability)))
 255                 rc = CIFSSMBQFSPosixInfo(xid, tcon, buf);
 256
 257         /*
 258          * Only need to call the old QFSInfo if failed on newer one,
 259          * e.g. by OS/2.
 260          **/
 261         if (rc && (tcon->ses->capabilities & CAP_NT_SMBS))
 262                 rc = CIFSSMBQFSInfo(xid, tcon, buf);
 263
 264         /*
 265          * Some old Windows servers also do not support level 103, retry with
 266          * older level one if old server failed the previous call or we
 267          * bypassed it because we detected that this was an older LANMAN sess
 268          */
 269         if (rc)
 270                 rc = SMBOldQFSInfo(xid, tcon, buf);
 271
 272         FreeXid(xid);
 273         return 0;
 274 }
 275
 276 static int cifs_permission(struct inode *inode, int mask)
 277 {
 278         struct cifs_sb_info *cifs_sb;
 279
 280         cifs_sb = CIFS_SB(inode->i_sb);
 281
 282         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
 283                 if ((mask & MAY_EXEC) && !execute_ok(inode))
 284                         return -EACCES;
 285                 else
 286                         return 0;
 287         } else /* file mode might have been restricted at mount time
 288                 on the client (above and beyond ACL on servers) for
 289                 servers which do not support setting and viewing mode bits,
 290                 so allowing client to check permissions is useful */
 291                 return generic_permission(inode, mask, NULL);
 292 }
 293
 294 static struct kmem_cache *cifs_inode_cachep;
 295 static struct kmem_cache *cifs_req_cachep;
 296 static struct kmem_cache *cifs_mid_cachep;
 297 struct kmem_cache *cifs_oplock_cachep;
 298 static struct kmem_cache *cifs_sm_req_cachep;
 299 mempool_t *cifs_sm_req_poolp;
 300 mempool_t *cifs_req_poolp;
 301 mempool_t *cifs_mid_poolp;
 302
 303 static struct inode *
 304 cifs_alloc_inode(struct super_block *sb)
 305 {
 306         struct cifsInodeInfo *cifs_inode;
 307         cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
 308         if (!cifs_inode)
 309                 return NULL;
 310         cifs_inode->cifsAttrs = 0x20;   /* default */
 311         cifs_inode->time = 0;
 312         cifs_inode->write_behind_rc = 0;
 313         /* Until the file is open and we have gotten oplock
 314         info back from the server, can not assume caching of
 315         file data or metadata */
 316         cifs_inode->clientCanCacheRead = false;
 317         cifs_inode->clientCanCacheAll = false;
 318         cifs_inode->delete_pending = false;
 319         cifs_inode->vfs_inode.i_blkbits = 14;  /* 2**14 = CIFS_MAX_MSGSIZE */
 320         cifs_inode->server_eof = 0;
 321
 322         /* Can not set i_flags here - they get immediately overwritten
 323            to zero by the VFS */
 324 /*      cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;*/
 325         INIT_LIST_HEAD(&cifs_inode->openFileList);
 326         return &cifs_inode->vfs_inode;
 327 }
 328
 329 static void
 330 cifs_destroy_inode(struct inode *inode)
 331 {
 332         kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
 333 }
 334
 335 static void
 336 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
 337 {
 338         seq_printf(s, ",addr=");
 339
 340         switch (server->addr.sockAddr.sin_family) {
 341         case AF_INET:
 342                 seq_printf(s, "%pI4", &server->addr.sockAddr.sin_addr.s_addr);
 343                 break;
 344         case AF_INET6:
 345                 seq_printf(s, "%pI6",
 346                            &server->addr.sockAddr6.sin6_addr.s6_addr);
 347                 if (server->addr.sockAddr6.sin6_scope_id)
 348                         seq_printf(s, "%%%u",
 349                                    server->addr.sockAddr6.sin6_scope_id);
 350                 break;
 351         default:
 352                 seq_printf(s, "(unknown)");
 353         }
 354 }
 355
 356 /*
 357  * cifs_show_options() is for displaying mount options in /proc/mounts.
 358  * Not all settable options are displayed but most of the important
 359  * ones are.
 360  */
 361 static int
 362 cifs_show_options(struct seq_file *s, struct vfsmount *m)
 363 {
 364         struct cifs_sb_info *cifs_sb;
 365         struct cifsTconInfo *tcon;
 366
 367         cifs_sb = CIFS_SB(m->mnt_sb);
 368         tcon = cifs_sb->tcon;
 369
 370         seq_printf(s, ",unc=%s", cifs_sb->tcon->treeName);
 371         if (tcon->ses->userName)
 372                 seq_printf(s, ",username=%s", tcon->ses->userName);
 373         if (tcon->ses->domainName)
 374                 seq_printf(s, ",domain=%s", tcon->ses->domainName);
 375
 376         seq_printf(s, ",uid=%d", cifs_sb->mnt_uid);
 377         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
 378                 seq_printf(s, ",forceuid");
 379
 380         seq_printf(s, ",gid=%d", cifs_sb->mnt_gid);
 381         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
 382                 seq_printf(s, ",forcegid");
 383
 384         cifs_show_address(s, tcon->ses->server);
 385
 386         if (!tcon->unix_ext)
 387                 seq_printf(s, ",file_mode=0%o,dir_mode=0%o",
 388                                            cifs_sb->mnt_file_mode,
 389                                            cifs_sb->mnt_dir_mode);
 390         if (tcon->seal)
 391                 seq_printf(s, ",seal");
 392         if (tcon->nocase)
 393                 seq_printf(s, ",nocase");
 394         if (tcon->retry)
 395                 seq_printf(s, ",hard");
 396         if (cifs_sb->prepath)
 397                 seq_printf(s, ",prepath=%s", cifs_sb->prepath);
 398         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 399                 seq_printf(s, ",posixpaths");
 400         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
 401                 seq_printf(s, ",setuids");
 402         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 403                 seq_printf(s, ",serverino");
 404         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
 405                 seq_printf(s, ",directio");
 406         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 407                 seq_printf(s, ",nouser_xattr");
 408         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 409                 seq_printf(s, ",mapchars");
 410         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
 411                 seq_printf(s, ",sfu");
 412         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 413                 seq_printf(s, ",nobrl");
 414         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
 415                 seq_printf(s, ",cifsacl");
 416         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
 417                 seq_printf(s, ",dynperm");
 418         if (m->mnt_sb->s_flags & MS_POSIXACL)
 419                 seq_printf(s, ",acl");
 420
 421         seq_printf(s, ",rsize=%d", cifs_sb->rsize);
 422         seq_printf(s, ",wsize=%d", cifs_sb->wsize);
 423
 424         return 0;
 425 }
 426
 427 #ifdef CONFIG_CIFS_QUOTA
 428 int cifs_xquota_set(struct super_block *sb, int quota_type, qid_t qid,
 429                 struct fs_disk_quota *pdquota)
 430 {
 431         int xid;
 432         int rc = 0;
 433         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 434         struct cifsTconInfo *pTcon;
 435
 436         if (cifs_sb)
 437                 pTcon = cifs_sb->tcon;
 438         else
 439                 return -EIO;
 440
 441
 442         xid = GetXid();
 443         if (pTcon) {
 444                 cFYI(1, ("set type: 0x%x id: %d", quota_type, qid));
 445         } else
 446                 rc = -EIO;
 447
 448         FreeXid(xid);
 449         return rc;
 450 }
 451
 452 int cifs_xquota_get(struct super_block *sb, int quota_type, qid_t qid,
 453                     struct fs_disk_quota *pdquota)
 454 {
 455         int xid;
 456         int rc = 0;
 457         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 458         struct cifsTconInfo *pTcon;
 459
 460         if (cifs_sb)
 461                 pTcon = cifs_sb->tcon;
 462         else
 463                 return -EIO;
 464
 465         xid = GetXid();
 466         if (pTcon) {
 467                 cFYI(1, ("set type: 0x%x id: %d", quota_type, qid));
 468         } else
 469                 rc = -EIO;
 470
 471         FreeXid(xid);
 472         return rc;
 473 }
 474
 475 int cifs_xstate_set(struct super_block *sb, unsigned int flags, int operation)
 476 {
 477         int xid;
 478         int rc = 0;
 479         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 480         struct cifsTconInfo *pTcon;
 481
 482         if (cifs_sb)
 483                 pTcon = cifs_sb->tcon;
 484         else
 485                 return -EIO;
 486
 487         xid = GetXid();
 488         if (pTcon) {
 489                 cFYI(1, ("flags: 0x%x operation: 0x%x", flags, operation));
 490         } else
 491                 rc = -EIO;
 492
 493         FreeXid(xid);
 494         return rc;
 495 }
 496
 497 int cifs_xstate_get(struct super_block *sb, struct fs_quota_stat *qstats)
 498 {
 499         int xid;
 500         int rc = 0;
 501         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 502         struct cifsTconInfo *pTcon;
 503
 504         if (cifs_sb)
 505                 pTcon = cifs_sb->tcon;
 506         else
 507                 return -EIO;
 508
 509         xid = GetXid();
 510         if (pTcon) {
 511                 cFYI(1, ("pqstats %p", qstats));
 512         } else
 513                 rc = -EIO;
 514
 515         FreeXid(xid);
 516         return rc;
 517 }
 518
 519 static struct quotactl_ops cifs_quotactl_ops = {
 520         .set_xquota     = cifs_xquota_set,
 521         .get_xquota     = cifs_xquota_get,
 522         .set_xstate     = cifs_xstate_set,
 523         .get_xstate     = cifs_xstate_get,
 524 };
 525 #endif
 526
 527 static void cifs_umount_begin(struct super_block *sb)
 528 {
 529         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 530         struct cifsTconInfo *tcon;
 531
 532         if (cifs_sb == NULL)
 533                 return;
 534
 535         tcon = cifs_sb->tcon;
 536         if (tcon == NULL)
 537                 return;
 538
 539         read_lock(&cifs_tcp_ses_lock);
 540         if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
 541                 /* we have other mounts to same share or we have
 542                    already tried to force umount this and woken up
 543                    all waiting network requests, nothing to do */
 544                 read_unlock(&cifs_tcp_ses_lock);
 545                 return;
 546         } else if (tcon->tc_count == 1)
 547                 tcon->tidStatus = CifsExiting;
 548         read_unlock(&cifs_tcp_ses_lock);
 549
 550         /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
 551         /* cancel_notify_requests(tcon); */
 552         if (tcon->ses && tcon->ses->server) {
 553                 cFYI(1, ("wake up tasks now - umount begin not complete"));
 554                 wake_up_all(&tcon->ses->server->request_q);
 555                 wake_up_all(&tcon->ses->server->response_q);
 556                 msleep(1); /* yield */
 557                 /* we have to kick the requests once more */
 558                 wake_up_all(&tcon->ses->server->response_q);
 559                 msleep(1);
 560         }
 561
 562         return;
 563 }
 564
 565 #ifdef CONFIG_CIFS_STATS2
 566 static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt)
 567 {
 568         /* BB FIXME */
 569         return 0;
 570 }
 571 #endif
 572
 573 static int cifs_remount(struct super_block *sb, int *flags, char *data)
 574 {
 575         *flags |= MS_NODIRATIME;
 576         return 0;
 577 }
 578
 579 static const struct super_operations cifs_super_ops = {
 580         .put_super = cifs_put_super,
 581         .statfs = cifs_statfs,
 582         .alloc_inode = cifs_alloc_inode,
 583         .destroy_inode = cifs_destroy_inode,
 584 /*      .drop_inode         = generic_delete_inode,
 585         .delete_inode   = cifs_delete_inode,  */  /* Do not need above two
 586         functions unless later we add lazy close of inodes or unless the
 587         kernel forgets to call us with the same number of releases (closes)
 588         as opens */
 589         .show_options = cifs_show_options,
 590         .umount_begin   = cifs_umount_begin,
 591         .remount_fs = cifs_remount,
 592 #ifdef CONFIG_CIFS_STATS2
 593         .show_stats = cifs_show_stats,
 594 #endif
 595 };
 596
 597 static int
 598 cifs_get_sb(struct file_system_type *fs_type,
 599             int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 600 {
 601         int rc;
 602         struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);
 603
 604         cFYI(1, ("Devname: %s flags: %d ", dev_name, flags));
 605
 606         if (IS_ERR(sb))
 607                 return PTR_ERR(sb);
 608
 609         sb->s_flags = flags;
 610
 611         rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
 612         if (rc) {
 613                 deactivate_locked_super(sb);
 614                 return rc;
 615         }
 616         sb->s_flags |= MS_ACTIVE;
 617         simple_set_mnt(mnt, sb);
 618         return 0;
 619 }
 620
 621 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 622                                    unsigned long nr_segs, loff_t pos)
 623 {
 624         struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
 625         ssize_t written;
 626
 627         written = generic_file_aio_write(iocb, iov, nr_segs, pos);
 628         if (!CIFS_I(inode)->clientCanCacheAll)
 629                 filemap_fdatawrite(inode->i_mapping);
 630         return written;
 631 }
 632
 633 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
 634 {
 635         /* origin == SEEK_END => we must revalidate the cached file length */
 636         if (origin == SEEK_END) {
 637                 int retval;
 638
 639                 /* some applications poll for the file length in this strange
 640                    way so we must seek to end on non-oplocked files by
 641                    setting the revalidate time to zero */
 642                 CIFS_I(file->f_path.dentry->d_inode)->time = 0;
 643
 644                 retval = cifs_revalidate(file->f_path.dentry);
 645                 if (retval < 0)
 646                         return (loff_t)retval;
 647         }
 648         return generic_file_llseek_unlocked(file, offset, origin);
 649 }
 650
 651 #ifdef CONFIG_CIFS_EXPERIMENTAL
 652 static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
 653 {
 654         /* note that this is called by vfs setlease with the BKL held
 655            although I doubt that BKL is needed here in cifs */
 656         struct inode *inode = file->f_path.dentry->d_inode;
 657
 658         if (!(S_ISREG(inode->i_mode)))
 659                 return -EINVAL;
 660
 661         /* check if file is oplocked */
 662         if (((arg == F_RDLCK) &&
 663                 (CIFS_I(inode)->clientCanCacheRead)) ||
 664             ((arg == F_WRLCK) &&
 665                 (CIFS_I(inode)->clientCanCacheAll)))
 666                 return generic_setlease(file, arg, lease);
 667         else if (CIFS_SB(inode->i_sb)->tcon->local_lease &&
 668                         !CIFS_I(inode)->clientCanCacheRead)
 669                 /* If the server claims to support oplock on this
 670                    file, then we still need to check oplock even
 671                    if the local_lease mount option is set, but there
 672                    are servers which do not support oplock for which
 673                    this mount option may be useful if the user
 674                    knows that the file won't be changed on the server
 675                    by anyone else */
 676                 return generic_setlease(file, arg, lease);
 677         else
 678                 return -EAGAIN;
 679 }
 680 #endif
 681
 682 struct file_system_type cifs_fs_type = {
 683         .owner = THIS_MODULE,
 684         .name = "cifs",
 685         .get_sb = cifs_get_sb,
 686         .kill_sb = kill_anon_super,
 687         /*  .fs_flags */
 688 };
 689 const struct inode_operations cifs_dir_inode_ops = {
 690         .create = cifs_create,
 691         .lookup = cifs_lookup,
 692         .getattr = cifs_getattr,
 693         .unlink = cifs_unlink,
 694         .link = cifs_hardlink,
 695         .mkdir = cifs_mkdir,
 696         .rmdir = cifs_rmdir,
 697         .rename = cifs_rename,
 698         .permission = cifs_permission,
 699 /*      revalidate:cifs_revalidate,   */
 700         .setattr = cifs_setattr,
 701         .symlink = cifs_symlink,
 702         .mknod   = cifs_mknod,
 703 #ifdef CONFIG_CIFS_XATTR
 704         .setxattr = cifs_setxattr,
 705         .getxattr = cifs_getxattr,
 706         .listxattr = cifs_listxattr,
 707         .removexattr = cifs_removexattr,
 708 #endif
 709 };
 710
 711 const struct inode_operations cifs_file_inode_ops = {
 712 /*      revalidate:cifs_revalidate, */
 713         .setattr = cifs_setattr,
 714         .getattr = cifs_getattr, /* do we need this anymore? */
 715         .rename = cifs_rename,
 716         .permission = cifs_permission,
 717 #ifdef CONFIG_CIFS_XATTR
 718         .setxattr = cifs_setxattr,
 719         .getxattr = cifs_getxattr,
 720         .listxattr = cifs_listxattr,
 721         .removexattr = cifs_removexattr,
 722 #endif
 723 };
 724
 725 const struct inode_operations cifs_symlink_inode_ops = {
 726         .readlink = generic_readlink,
 727         .follow_link = cifs_follow_link,
 728         .put_link = cifs_put_link,
 729         .permission = cifs_permission,
 730         /* BB add the following two eventually */
 731         /* revalidate: cifs_revalidate,
 732            setattr:    cifs_notify_change, *//* BB do we need notify change */
 733 #ifdef CONFIG_CIFS_XATTR
 734         .setxattr = cifs_setxattr,
 735         .getxattr = cifs_getxattr,
 736         .listxattr = cifs_listxattr,
 737         .removexattr = cifs_removexattr,
 738 #endif
 739 };
 740
 741 const struct file_operations cifs_file_ops = {
 742         .read = do_sync_read,
 743         .write = do_sync_write,
 744         .aio_read = generic_file_aio_read,
 745         .aio_write = cifs_file_aio_write,
 746         .open = cifs_open,
 747         .release = cifs_close,
 748         .lock = cifs_lock,
 749         .fsync = cifs_fsync,
 750         .flush = cifs_flush,
 751         .mmap  = cifs_file_mmap,
 752         .splice_read = generic_file_splice_read,
 753         .llseek = cifs_llseek,
 754 #ifdef CONFIG_CIFS_POSIX
 755         .unlocked_ioctl = cifs_ioctl,
 756 #endif /* CONFIG_CIFS_POSIX */
 757
 758 #ifdef CONFIG_CIFS_EXPERIMENTAL
 759         .setlease = cifs_setlease,
 760 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 761 };
 762
 763 const struct file_operations cifs_file_direct_ops = {
 764         /* no mmap, no aio, no readv -
 765            BB reevaluate whether they can be done with directio, no cache */
 766         .read = cifs_user_read,
 767         .write = cifs_user_write,
 768         .open = cifs_open,
 769         .release = cifs_close,
 770         .lock = cifs_lock,
 771         .fsync = cifs_fsync,
 772         .flush = cifs_flush,
 773         .splice_read = generic_file_splice_read,
 774 #ifdef CONFIG_CIFS_POSIX
 775         .unlocked_ioctl  = cifs_ioctl,
 776 #endif /* CONFIG_CIFS_POSIX */
 777         .llseek = cifs_llseek,
 778 #ifdef CONFIG_CIFS_EXPERIMENTAL
 779         .setlease = cifs_setlease,
 780 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 781 };
 782 const struct file_operations cifs_file_nobrl_ops = {
 783         .read = do_sync_read,
 784         .write = do_sync_write,
 785         .aio_read = generic_file_aio_read,
 786         .aio_write = cifs_file_aio_write,
 787         .open = cifs_open,
 788         .release = cifs_close,
 789         .fsync = cifs_fsync,
 790         .flush = cifs_flush,
 791         .mmap  = cifs_file_mmap,
 792         .splice_read = generic_file_splice_read,
 793         .llseek = cifs_llseek,
 794 #ifdef CONFIG_CIFS_POSIX
 795         .unlocked_ioctl = cifs_ioctl,
 796 #endif /* CONFIG_CIFS_POSIX */
 797
 798 #ifdef CONFIG_CIFS_EXPERIMENTAL
 799         .setlease = cifs_setlease,
 800 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 801 };
 802
 803 const struct file_operations cifs_file_direct_nobrl_ops = {
 804         /* no mmap, no aio, no readv -
 805            BB reevaluate whether they can be done with directio, no cache */
 806         .read = cifs_user_read,
 807         .write = cifs_user_write,
 808         .open = cifs_open,
 809         .release = cifs_close,
 810         .fsync = cifs_fsync,
 811         .flush = cifs_flush,
 812         .splice_read = generic_file_splice_read,
 813 #ifdef CONFIG_CIFS_POSIX
 814         .unlocked_ioctl  = cifs_ioctl,
 815 #endif /* CONFIG_CIFS_POSIX */
 816         .llseek = cifs_llseek,
 817 #ifdef CONFIG_CIFS_EXPERIMENTAL
 818         .setlease = cifs_setlease,
 819 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 820 };
 821
 822 const struct file_operations cifs_dir_ops = {
 823         .readdir = cifs_readdir,
 824         .release = cifs_closedir,
 825         .read    = generic_read_dir,
 826         .unlocked_ioctl  = cifs_ioctl,
 827         .llseek = generic_file_llseek,
 828 };
 829
 830 static void
 831 cifs_init_once(void *inode)
 832 {
 833         struct cifsInodeInfo *cifsi = inode;
 834
 835         inode_init_once(&cifsi->vfs_inode);
 836         INIT_LIST_HEAD(&cifsi->lockList);
 837 }
 838
 839 static int
 840 cifs_init_inodecache(void)
 841 {
 842         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
 843                                               sizeof(struct cifsInodeInfo),
 844                                               0, (SLAB_RECLAIM_ACCOUNT|
 845                                                 SLAB_MEM_SPREAD),
 846                                               cifs_init_once);
 847         if (cifs_inode_cachep == NULL)
 848                 return -ENOMEM;
 849
 850         return 0;
 851 }
 852
 853 static void
 854 cifs_destroy_inodecache(void)
 855 {
 856         kmem_cache_destroy(cifs_inode_cachep);
 857 }
 858
 859 static int
 860 cifs_init_request_bufs(void)
 861 {
 862         if (CIFSMaxBufSize < 8192) {
 863         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
 864         Unicode path name has to fit in any SMB/CIFS path based frames */
 865                 CIFSMaxBufSize = 8192;
 866         } else if (CIFSMaxBufSize > 1024*127) {
 867                 CIFSMaxBufSize = 1024 * 127;
 868         } else {
 869                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
 870         }
 871 /*      cERROR(1,("CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize)); */
 872         cifs_req_cachep = kmem_cache_create("cifs_request",
 873                                             CIFSMaxBufSize +
 874                                             MAX_CIFS_HDR_SIZE, 0,
 875                                             SLAB_HWCACHE_ALIGN, NULL);
 876         if (cifs_req_cachep == NULL)
 877                 return -ENOMEM;
 878
 879         if (cifs_min_rcv < 1)
 880                 cifs_min_rcv = 1;
 881         else if (cifs_min_rcv > 64) {
 882                 cifs_min_rcv = 64;
 883                 cERROR(1, ("cifs_min_rcv set to maximum (64)"));
 884         }
 885
 886         cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
 887                                                   cifs_req_cachep);
 888
 889         if (cifs_req_poolp == NULL) {
 890                 kmem_cache_destroy(cifs_req_cachep);
 891                 return -ENOMEM;
 892         }
 893         /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
 894         almost all handle based requests (but not write response, nor is it
 895         sufficient for path based requests).  A smaller size would have
 896         been more efficient (compacting multiple slab items on one 4k page)
 897         for the case in which debug was on, but this larger size allows
 898         more SMBs to use small buffer alloc and is still much more
 899         efficient to alloc 1 per page off the slab compared to 17K (5page)
 900         alloc of large cifs buffers even when page debugging is on */
 901         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
 902                         MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
 903                         NULL);
 904         if (cifs_sm_req_cachep == NULL) {
 905                 mempool_destroy(cifs_req_poolp);
 906                 kmem_cache_destroy(cifs_req_cachep);
 907                 return -ENOMEM;
 908         }
 909
 910         if (cifs_min_small < 2)
 911                 cifs_min_small = 2;
 912         else if (cifs_min_small > 256) {
 913                 cifs_min_small = 256;
 914                 cFYI(1, ("cifs_min_small set to maximum (256)"));
 915         }
 916
 917         cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
 918                                                      cifs_sm_req_cachep);
 919
 920         if (cifs_sm_req_poolp == NULL) {
 921                 mempool_destroy(cifs_req_poolp);
 922                 kmem_cache_destroy(cifs_req_cachep);
 923                 kmem_cache_destroy(cifs_sm_req_cachep);
 924                 return -ENOMEM;
 925         }
 926
 927         return 0;
 928 }
 929
 930 static void
 931 cifs_destroy_request_bufs(void)
 932 {
 933         mempool_destroy(cifs_req_poolp);
 934         kmem_cache_destroy(cifs_req_cachep);
 935         mempool_destroy(cifs_sm_req_poolp);
 936         kmem_cache_destroy(cifs_sm_req_cachep);
 937 }
 938
 939 static int
 940 cifs_init_mids(void)
 941 {
 942         cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
 943                                             sizeof(struct mid_q_entry), 0,
 944                                             SLAB_HWCACHE_ALIGN, NULL);
 945         if (cifs_mid_cachep == NULL)
 946                 return -ENOMEM;
 947
 948         /* 3 is a reasonable minimum number of simultaneous operations */
 949         cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
 950         if (cifs_mid_poolp == NULL) {
 951                 kmem_cache_destroy(cifs_mid_cachep);
 952                 return -ENOMEM;
 953         }
 954
 955         cifs_oplock_cachep = kmem_cache_create("cifs_oplock_structs",
 956                                         sizeof(struct oplock_q_entry), 0,
 957                                         SLAB_HWCACHE_ALIGN, NULL);
 958         if (cifs_oplock_cachep == NULL) {
 959                 mempool_destroy(cifs_mid_poolp);
 960                 kmem_cache_destroy(cifs_mid_cachep);
 961                 return -ENOMEM;
 962         }
 963
 964         return 0;
 965 }
 966
 967 static void
 968 cifs_destroy_mids(void)
 969 {
 970         mempool_destroy(cifs_mid_poolp);
 971         kmem_cache_destroy(cifs_mid_cachep);
 972         kmem_cache_destroy(cifs_oplock_cachep);
 973 }
 974
 975 static int cifs_oplock_thread(void *dummyarg)
 976 {
 977         struct oplock_q_entry *oplock_item;
 978         struct cifsTconInfo *pTcon;
 979         struct inode *inode;
 980         __u16  netfid;
 981         int rc, waitrc = 0;
 982
 983         set_freezable();
 984         do {
 985                 if (try_to_freeze())
 986                         continue;
 987
 988                 spin_lock(&GlobalMid_Lock);
 989                 if (list_empty(&GlobalOplock_Q)) {
 990                         spin_unlock(&GlobalMid_Lock);
 991                         set_current_state(TASK_INTERRUPTIBLE);
 992                         schedule_timeout(39*HZ);
 993                 } else {
 994                         oplock_item = list_entry(GlobalOplock_Q.next,
 995                                                 struct oplock_q_entry, qhead);
 996                         cFYI(1, ("found oplock item to write out"));
 997                         pTcon = oplock_item->tcon;
 998                         inode = oplock_item->pinode;
 999                         netfid = oplock_item->netfid;
1000                         spin_unlock(&GlobalMid_Lock);
1001                         DeleteOplockQEntry(oplock_item);
1002                         /* can not grab inode sem here since it would
1003                                 deadlock when oplock received on delete
1004                                 since vfs_unlink holds the i_mutex across
1005                                 the call */
1006                         /* mutex_lock(&inode->i_mutex);*/
1007                         if (S_ISREG(inode->i_mode)) {
1008 #ifdef CONFIG_CIFS_EXPERIMENTAL
1009                                 if (CIFS_I(inode)->clientCanCacheAll == 0)
1010                                         break_lease(inode, FMODE_READ);
1011                                 else if (CIFS_I(inode)->clientCanCacheRead == 0)
1012                                         break_lease(inode, FMODE_WRITE);
1013 #endif
1014                                 rc = filemap_fdatawrite(inode->i_mapping);
1015                                 if (CIFS_I(inode)->clientCanCacheRead == 0) {
1016                                         waitrc = filemap_fdatawait(
1017                                                               inode->i_mapping);
1018                                         invalidate_remote_inode(inode);
1019                                 }
1020                                 if (rc == 0)
1021                                         rc = waitrc;
1022                         } else
1023                                 rc = 0;
1024                         /* mutex_unlock(&inode->i_mutex);*/
1025                         if (rc)
1026                                 CIFS_I(inode)->write_behind_rc = rc;
1027                         cFYI(1, ("Oplock flush inode %p rc %d",
1028                                 inode, rc));
1029
1030                                 /* releasing stale oplock after recent reconnect
1031                                 of smb session using a now incorrect file
1032                                 handle is not a data integrity issue but do
1033                                 not bother sending an oplock release if session
1034                                 to server still is disconnected since oplock
1035                                 already released by the server in that case */
1036                         if (!pTcon->need_reconnect) {
1037                                 rc = CIFSSMBLock(0, pTcon, netfid,
1038                                                 0 /* len */ , 0 /* offset */, 0,
1039                                                 0, LOCKING_ANDX_OPLOCK_RELEASE,
1040                                                 false /* wait flag */);
1041                                 cFYI(1, ("Oplock release rc = %d", rc));
1042                         }
1043                         set_current_state(TASK_INTERRUPTIBLE);
1044                         schedule_timeout(1);  /* yield in case q were corrupt */
1045                 }
1046         } while (!kthread_should_stop());
1047
1048         return 0;
1049 }
1050
1051 static int __init
1052 init_cifs(void)
1053 {
1054         int rc = 0;
1055         cifs_proc_init();
1056         INIT_LIST_HEAD(&cifs_tcp_ses_list);
1057         INIT_LIST_HEAD(&GlobalOplock_Q);
1058 #ifdef CONFIG_CIFS_EXPERIMENTAL
1059         INIT_LIST_HEAD(&GlobalDnotifyReqList);
1060         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1061 #endif
1062 /*
1063  *  Initialize Global counters
1064  */
1065         atomic_set(&sesInfoAllocCount, 0);
1066         atomic_set(&tconInfoAllocCount, 0);
1067         atomic_set(&tcpSesAllocCount, 0);
1068         atomic_set(&tcpSesReconnectCount, 0);
1069         atomic_set(&tconInfoReconnectCount, 0);
1070
1071         atomic_set(&bufAllocCount, 0);
1072         atomic_set(&smBufAllocCount, 0);
1073 #ifdef CONFIG_CIFS_STATS2
1074         atomic_set(&totBufAllocCount, 0);
1075         atomic_set(&totSmBufAllocCount, 0);
1076 #endif /* CONFIG_CIFS_STATS2 */
1077
1078         atomic_set(&midCount, 0);
1079         GlobalCurrentXid = 0;
1080         GlobalTotalActiveXid = 0;
1081         GlobalMaxActiveXid = 0;
1082         memset(Local_System_Name, 0, 15);
1083         rwlock_init(&GlobalSMBSeslock);
1084         rwlock_init(&cifs_tcp_ses_lock);
1085         spin_lock_init(&GlobalMid_Lock);
1086
1087         if (cifs_max_pending < 2) {
1088                 cifs_max_pending = 2;
1089                 cFYI(1, ("cifs_max_pending set to min of 2"));
1090         } else if (cifs_max_pending > 256) {
1091                 cifs_max_pending = 256;
1092                 cFYI(1, ("cifs_max_pending set to max of 256"));
1093         }
1094
1095         rc = cifs_init_inodecache();
1096         if (rc)
1097                 goto out_clean_proc;
1098
1099         rc = cifs_init_mids();
1100         if (rc)
1101                 goto out_destroy_inodecache;
1102
1103         rc = cifs_init_request_bufs();
1104         if (rc)
1105                 goto out_destroy_mids;
1106
1107         rc = register_filesystem(&cifs_fs_type);
1108         if (rc)
1109                 goto out_destroy_request_bufs;
1110 #ifdef CONFIG_CIFS_UPCALL
1111         rc = register_key_type(&cifs_spnego_key_type);
1112         if (rc)
1113                 goto out_unregister_filesystem;
1114 #endif
1115 #ifdef CONFIG_CIFS_DFS_UPCALL
1116         rc = register_key_type(&key_type_dns_resolver);
1117         if (rc)
1118                 goto out_unregister_key_type;
1119 #endif
1120         oplockThread = kthread_run(cifs_oplock_thread, NULL, "cifsoplockd");
1121         if (IS_ERR(oplockThread)) {
1122                 rc = PTR_ERR(oplockThread);
1123                 cERROR(1, ("error %d create oplock thread", rc));
1124                 goto out_unregister_dfs_key_type;
1125         }
1126
1127         return 0;
1128
1129  out_unregister_dfs_key_type:
1130 #ifdef CONFIG_CIFS_DFS_UPCALL
1131         unregister_key_type(&key_type_dns_resolver);
1132  out_unregister_key_type:
1133 #endif
1134 #ifdef CONFIG_CIFS_UPCALL
1135         unregister_key_type(&cifs_spnego_key_type);
1136  out_unregister_filesystem:
1137 #endif
1138         unregister_filesystem(&cifs_fs_type);
1139  out_destroy_request_bufs:
1140         cifs_destroy_request_bufs();
1141  out_destroy_mids:
1142         cifs_destroy_mids();
1143  out_destroy_inodecache:
1144         cifs_destroy_inodecache();
1145  out_clean_proc:
1146         cifs_proc_clean();
1147         return rc;
1148 }
1149
1150 static void __exit
1151 exit_cifs(void)
1152 {
1153         cFYI(DBG2, ("exit_cifs"));
1154         cifs_proc_clean();
1155 #ifdef CONFIG_CIFS_DFS_UPCALL
1156         cifs_dfs_release_automount_timer();
1157         unregister_key_type(&key_type_dns_resolver);
1158 #endif
1159 #ifdef CONFIG_CIFS_UPCALL
1160         unregister_key_type(&cifs_spnego_key_type);
1161 #endif
1162         unregister_filesystem(&cifs_fs_type);
1163         cifs_destroy_inodecache();
1164         cifs_destroy_mids();
1165         cifs_destroy_request_bufs();
1166         kthread_stop(oplockThread);
1167 }
1168
1169 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1170 MODULE_LICENSE("GPL");  /* combination of LGPL + GPL source behaves as GPL */
1171 MODULE_DESCRIPTION
1172     ("VFS to access servers complying with the SNIA CIFS Specification "
1173      "e.g. Samba and Windows");
1174 MODULE_VERSION(CIFS_VERSION);
1175 module_init(init_cifs)
1176 module_exit(exit_cifs)