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 "cifsfs.h"
  39 #include "cifspdu.h"
  40 #define DECLARE_GLOBALS_HERE
  41 #include "cifsglob.h"
  42 #include "cifsproto.h"
  43 #include "cifs_debug.h"
  44 #include "cifs_fs_sb.h"
  45 #include <linux/mm.h>
  46 #include <linux/key-type.h>
  47 #include "dns_resolve.h"
  48 #include "cifs_spnego.h"
  49 #define CIFS_MAGIC_NUMBER 0xFF534D42    /* the first four bytes of SMB PDUs */
  50
  51 #ifdef CONFIG_CIFS_QUOTA
  52 static struct quotactl_ops cifs_quotactl_ops;
  53 #endif /* QUOTA */
  54
  55 int cifsFYI = 0;
  56 int cifsERROR = 1;
  57 int traceSMB = 0;
  58 unsigned int oplockEnabled = 1;
  59 unsigned int experimEnabled = 0;
  60 unsigned int linuxExtEnabled = 1;
  61 unsigned int lookupCacheEnabled = 1;
  62 unsigned int multiuser_mount = 0;
  63 unsigned int extended_security = CIFSSEC_DEF;
  64 /* unsigned int ntlmv2_support = 0; */
  65 unsigned int sign_CIFS_PDUs = 1;
  66 extern struct task_struct *oplockThread; /* remove sparse warning */
  67 struct task_struct *oplockThread = NULL;
  68 /* extern struct task_struct * dnotifyThread; remove sparse warning */
  69 static struct task_struct *dnotifyThread = NULL;
  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_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         rc = cifs_umount(sb, cifs_sb);
 208         if (rc)
 209                 cERROR(1, ("cifs_umount failed with return code %d", rc));
 210 #ifdef CONFIG_CIFS_DFS_UPCALL
 211         if (cifs_sb->mountdata) {
 212                 kfree(cifs_sb->mountdata);
 213                 cifs_sb->mountdata = NULL;
 214         }
 215 #endif
 216
 217         unload_nls(cifs_sb->local_nls);
 218         kfree(cifs_sb);
 219         return;
 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, struct nameidata *nd)
 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                 return 0;
 280         else /* file mode might have been restricted at mount time
 281                 on the client (above and beyond ACL on servers) for
 282                 servers which do not support setting and viewing mode bits,
 283                 so allowing client to check permissions is useful */
 284                 return generic_permission(inode, mask, NULL);
 285 }
 286
 287 static struct kmem_cache *cifs_inode_cachep;
 288 static struct kmem_cache *cifs_req_cachep;
 289 static struct kmem_cache *cifs_mid_cachep;
 290 struct kmem_cache *cifs_oplock_cachep;
 291 static struct kmem_cache *cifs_sm_req_cachep;
 292 mempool_t *cifs_sm_req_poolp;
 293 mempool_t *cifs_req_poolp;
 294 mempool_t *cifs_mid_poolp;
 295
 296 static struct inode *
 297 cifs_alloc_inode(struct super_block *sb)
 298 {
 299         struct cifsInodeInfo *cifs_inode;
 300         cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
 301         if (!cifs_inode)
 302                 return NULL;
 303         cifs_inode->cifsAttrs = 0x20;   /* default */
 304         atomic_set(&cifs_inode->inUse, 0);
 305         cifs_inode->time = 0;
 306         cifs_inode->write_behind_rc = 0;
 307         /* Until the file is open and we have gotten oplock
 308         info back from the server, can not assume caching of
 309         file data or metadata */
 310         cifs_inode->clientCanCacheRead = false;
 311         cifs_inode->clientCanCacheAll = false;
 312         cifs_inode->vfs_inode.i_blkbits = 14;  /* 2**14 = CIFS_MAX_MSGSIZE */
 313
 314         /* Can not set i_flags here - they get immediately overwritten
 315            to zero by the VFS */
 316 /*      cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;*/
 317         INIT_LIST_HEAD(&cifs_inode->openFileList);
 318         return &cifs_inode->vfs_inode;
 319 }
 320
 321 static void
 322 cifs_destroy_inode(struct inode *inode)
 323 {
 324         kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
 325 }
 326
 327 /*
 328  * cifs_show_options() is for displaying mount options in /proc/mounts.
 329  * Not all settable options are displayed but most of the important
 330  * ones are.
 331  */
 332 static int
 333 cifs_show_options(struct seq_file *s, struct vfsmount *m)
 334 {
 335         struct cifs_sb_info *cifs_sb;
 336
 337         cifs_sb = CIFS_SB(m->mnt_sb);
 338
 339         if (cifs_sb) {
 340                 if (cifs_sb->tcon) {
 341 /* BB add prepath to mount options displayed */
 342                         seq_printf(s, ",unc=%s", cifs_sb->tcon->treeName);
 343                         if (cifs_sb->tcon->ses) {
 344                                 if (cifs_sb->tcon->ses->userName)
 345                                         seq_printf(s, ",username=%s",
 346                                            cifs_sb->tcon->ses->userName);
 347                                 if (cifs_sb->tcon->ses->domainName)
 348                                         seq_printf(s, ",domain=%s",
 349                                            cifs_sb->tcon->ses->domainName);
 350                         }
 351                         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID) ||
 352                            !(cifs_sb->tcon->unix_ext))
 353                                 seq_printf(s, ",uid=%d", cifs_sb->mnt_uid);
 354                         if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID) ||
 355                            !(cifs_sb->tcon->unix_ext))
 356                                 seq_printf(s, ",gid=%d", cifs_sb->mnt_gid);
 357                         if (!cifs_sb->tcon->unix_ext) {
 358                                 seq_printf(s, ",file_mode=0%o,dir_mode=0%o",
 359                                            cifs_sb->mnt_file_mode,
 360                                            cifs_sb->mnt_dir_mode);
 361                         }
 362                         if (cifs_sb->tcon->seal)
 363                                 seq_printf(s, ",seal");
 364                         if (cifs_sb->tcon->nocase)
 365                                 seq_printf(s, ",nocase");
 366                         if (cifs_sb->tcon->retry)
 367                                 seq_printf(s, ",hard");
 368                 }
 369                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 370                         seq_printf(s, ",posixpaths");
 371                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
 372                         seq_printf(s, ",setuids");
 373                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 374                         seq_printf(s, ",serverino");
 375                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
 376                         seq_printf(s, ",directio");
 377                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 378                         seq_printf(s, ",nouser_xattr");
 379                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 380                         seq_printf(s, ",mapchars");
 381                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
 382                         seq_printf(s, ",sfu");
 383                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 384                         seq_printf(s, ",nobrl");
 385                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
 386                         seq_printf(s, ",cifsacl");
 387                 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
 388                         seq_printf(s, ",dynperm");
 389                 if (m->mnt_sb->s_flags & MS_POSIXACL)
 390                         seq_printf(s, ",acl");
 391
 392                 seq_printf(s, ",rsize=%d", cifs_sb->rsize);
 393                 seq_printf(s, ",wsize=%d", cifs_sb->wsize);
 394         }
 395         return 0;
 396 }
 397
 398 #ifdef CONFIG_CIFS_QUOTA
 399 int cifs_xquota_set(struct super_block *sb, int quota_type, qid_t qid,
 400                 struct fs_disk_quota *pdquota)
 401 {
 402         int xid;
 403         int rc = 0;
 404         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 405         struct cifsTconInfo *pTcon;
 406
 407         if (cifs_sb)
 408                 pTcon = cifs_sb->tcon;
 409         else
 410                 return -EIO;
 411
 412
 413         xid = GetXid();
 414         if (pTcon) {
 415                 cFYI(1, ("set type: 0x%x id: %d", quota_type, qid));
 416         } else {
 417                 rc = -EIO;
 418         }
 419
 420         FreeXid(xid);
 421         return rc;
 422 }
 423
 424 int cifs_xquota_get(struct super_block *sb, int quota_type, qid_t qid,
 425                     struct fs_disk_quota *pdquota)
 426 {
 427         int xid;
 428         int rc = 0;
 429         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 430         struct cifsTconInfo *pTcon;
 431
 432         if (cifs_sb)
 433                 pTcon = cifs_sb->tcon;
 434         else
 435                 return -EIO;
 436
 437         xid = GetXid();
 438         if (pTcon) {
 439                 cFYI(1, ("set type: 0x%x id: %d", quota_type, qid));
 440         } else {
 441                 rc = -EIO;
 442         }
 443
 444         FreeXid(xid);
 445         return rc;
 446 }
 447
 448 int cifs_xstate_set(struct super_block *sb, unsigned int flags, int operation)
 449 {
 450         int xid;
 451         int rc = 0;
 452         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 453         struct cifsTconInfo *pTcon;
 454
 455         if (cifs_sb)
 456                 pTcon = cifs_sb->tcon;
 457         else
 458                 return -EIO;
 459
 460         xid = GetXid();
 461         if (pTcon) {
 462                 cFYI(1, ("flags: 0x%x operation: 0x%x", flags, operation));
 463         } else {
 464                 rc = -EIO;
 465         }
 466
 467         FreeXid(xid);
 468         return rc;
 469 }
 470
 471 int cifs_xstate_get(struct super_block *sb, struct fs_quota_stat *qstats)
 472 {
 473         int xid;
 474         int rc = 0;
 475         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 476         struct cifsTconInfo *pTcon;
 477
 478         if (cifs_sb) {
 479                 pTcon = cifs_sb->tcon;
 480         } else {
 481                 return -EIO;
 482         }
 483         xid = GetXid();
 484         if (pTcon) {
 485                 cFYI(1, ("pqstats %p", qstats));
 486         } else {
 487                 rc = -EIO;
 488         }
 489
 490         FreeXid(xid);
 491         return rc;
 492 }
 493
 494 static struct quotactl_ops cifs_quotactl_ops = {
 495         .set_xquota     = cifs_xquota_set,
 496         .get_xquota     = cifs_xquota_get,
 497         .set_xstate     = cifs_xstate_set,
 498         .get_xstate     = cifs_xstate_get,
 499 };
 500 #endif
 501
 502 static void cifs_umount_begin(struct super_block *sb)
 503 {
 504         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 505         struct cifsTconInfo *tcon;
 506
 507         if (cifs_sb == NULL)
 508                 return;
 509
 510         tcon = cifs_sb->tcon;
 511         if (tcon == NULL)
 512                 return;
 513         down(&tcon->tconSem);
 514         if (atomic_read(&tcon->useCount) == 1)
 515                 tcon->tidStatus = CifsExiting;
 516         up(&tcon->tconSem);
 517
 518         /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
 519         /* cancel_notify_requests(tcon); */
 520         if (tcon->ses && tcon->ses->server) {
 521                 cFYI(1, ("wake up tasks now - umount begin not complete"));
 522                 wake_up_all(&tcon->ses->server->request_q);
 523                 wake_up_all(&tcon->ses->server->response_q);
 524                 msleep(1); /* yield */
 525                 /* we have to kick the requests once more */
 526                 wake_up_all(&tcon->ses->server->response_q);
 527                 msleep(1);
 528         }
 529 /* BB FIXME - finish add checks for tidStatus BB */
 530
 531         return;
 532 }
 533
 534 #ifdef CONFIG_CIFS_STATS2
 535 static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt)
 536 {
 537         /* BB FIXME */
 538         return 0;
 539 }
 540 #endif
 541
 542 static int cifs_remount(struct super_block *sb, int *flags, char *data)
 543 {
 544         *flags |= MS_NODIRATIME;
 545         return 0;
 546 }
 547
 548 static const struct super_operations cifs_super_ops = {
 549         .put_super = cifs_put_super,
 550         .statfs = cifs_statfs,
 551         .alloc_inode = cifs_alloc_inode,
 552         .destroy_inode = cifs_destroy_inode,
 553 /*      .drop_inode         = generic_delete_inode,
 554         .delete_inode   = cifs_delete_inode,  */  /* Do not need above two
 555         functions unless later we add lazy close of inodes or unless the
 556         kernel forgets to call us with the same number of releases (closes)
 557         as opens */
 558         .show_options = cifs_show_options,
 559         .umount_begin   = cifs_umount_begin,
 560         .remount_fs = cifs_remount,
 561 #ifdef CONFIG_CIFS_STATS2
 562         .show_stats = cifs_show_stats,
 563 #endif
 564 };
 565
 566 static int
 567 cifs_get_sb(struct file_system_type *fs_type,
 568             int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 569 {
 570         int rc;
 571         struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);
 572
 573         cFYI(1, ("Devname: %s flags: %d ", dev_name, flags));
 574
 575         if (IS_ERR(sb))
 576                 return PTR_ERR(sb);
 577
 578         sb->s_flags = flags;
 579
 580         rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
 581         if (rc) {
 582                 up_write(&sb->s_umount);
 583                 deactivate_super(sb);
 584                 return rc;
 585         }
 586         sb->s_flags |= MS_ACTIVE;
 587         return simple_set_mnt(mnt, sb);
 588 }
 589
 590 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 591                                    unsigned long nr_segs, loff_t pos)
 592 {
 593         struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
 594         ssize_t written;
 595
 596         written = generic_file_aio_write(iocb, iov, nr_segs, pos);
 597         if (!CIFS_I(inode)->clientCanCacheAll)
 598                 filemap_fdatawrite(inode->i_mapping);
 599         return written;
 600 }
 601
 602 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
 603 {
 604         /* origin == SEEK_END => we must revalidate the cached file length */
 605         if (origin == SEEK_END) {
 606                 int retval;
 607
 608                 /* some applications poll for the file length in this strange
 609                    way so we must seek to end on non-oplocked files by
 610                    setting the revalidate time to zero */
 611                 CIFS_I(file->f_path.dentry->d_inode)->time = 0;
 612
 613                 retval = cifs_revalidate(file->f_path.dentry);
 614                 if (retval < 0)
 615                         return (loff_t)retval;
 616         }
 617         return remote_llseek(file, offset, origin);
 618 }
 619
 620 struct file_system_type cifs_fs_type = {
 621         .owner = THIS_MODULE,
 622         .name = "cifs",
 623         .get_sb = cifs_get_sb,
 624         .kill_sb = kill_anon_super,
 625         /*  .fs_flags */
 626 };
 627 const struct inode_operations cifs_dir_inode_ops = {
 628         .create = cifs_create,
 629         .lookup = cifs_lookup,
 630         .getattr = cifs_getattr,
 631         .unlink = cifs_unlink,
 632         .link = cifs_hardlink,
 633         .mkdir = cifs_mkdir,
 634         .rmdir = cifs_rmdir,
 635         .rename = cifs_rename,
 636         .permission = cifs_permission,
 637 /*      revalidate:cifs_revalidate,   */
 638         .setattr = cifs_setattr,
 639         .symlink = cifs_symlink,
 640         .mknod   = cifs_mknod,
 641 #ifdef CONFIG_CIFS_XATTR
 642         .setxattr = cifs_setxattr,
 643         .getxattr = cifs_getxattr,
 644         .listxattr = cifs_listxattr,
 645         .removexattr = cifs_removexattr,
 646 #endif
 647 };
 648
 649 const struct inode_operations cifs_file_inode_ops = {
 650 /*      revalidate:cifs_revalidate, */
 651         .setattr = cifs_setattr,
 652         .getattr = cifs_getattr, /* do we need this anymore? */
 653         .rename = cifs_rename,
 654         .permission = cifs_permission,
 655 #ifdef CONFIG_CIFS_XATTR
 656         .setxattr = cifs_setxattr,
 657         .getxattr = cifs_getxattr,
 658         .listxattr = cifs_listxattr,
 659         .removexattr = cifs_removexattr,
 660 #endif
 661 };
 662
 663 const struct inode_operations cifs_symlink_inode_ops = {
 664         .readlink = generic_readlink,
 665         .follow_link = cifs_follow_link,
 666         .put_link = cifs_put_link,
 667         .permission = cifs_permission,
 668         /* BB add the following two eventually */
 669         /* revalidate: cifs_revalidate,
 670            setattr:    cifs_notify_change, *//* BB do we need notify change */
 671 #ifdef CONFIG_CIFS_XATTR
 672         .setxattr = cifs_setxattr,
 673         .getxattr = cifs_getxattr,
 674         .listxattr = cifs_listxattr,
 675         .removexattr = cifs_removexattr,
 676 #endif
 677 };
 678
 679 const struct file_operations cifs_file_ops = {
 680         .read = do_sync_read,
 681         .write = do_sync_write,
 682         .aio_read = generic_file_aio_read,
 683         .aio_write = cifs_file_aio_write,
 684         .open = cifs_open,
 685         .release = cifs_close,
 686         .lock = cifs_lock,
 687         .fsync = cifs_fsync,
 688         .flush = cifs_flush,
 689         .mmap  = cifs_file_mmap,
 690         .splice_read = generic_file_splice_read,
 691         .llseek = cifs_llseek,
 692 #ifdef CONFIG_CIFS_POSIX
 693         .unlocked_ioctl = cifs_ioctl,
 694 #endif /* CONFIG_CIFS_POSIX */
 695
 696 #ifdef CONFIG_CIFS_EXPERIMENTAL
 697         .dir_notify = cifs_dir_notify,
 698 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 699 };
 700
 701 const struct file_operations cifs_file_direct_ops = {
 702         /* no mmap, no aio, no readv -
 703            BB reevaluate whether they can be done with directio, no cache */
 704         .read = cifs_user_read,
 705         .write = cifs_user_write,
 706         .open = cifs_open,
 707         .release = cifs_close,
 708         .lock = cifs_lock,
 709         .fsync = cifs_fsync,
 710         .flush = cifs_flush,
 711         .splice_read = generic_file_splice_read,
 712 #ifdef CONFIG_CIFS_POSIX
 713         .unlocked_ioctl  = cifs_ioctl,
 714 #endif /* CONFIG_CIFS_POSIX */
 715         .llseek = cifs_llseek,
 716 #ifdef CONFIG_CIFS_EXPERIMENTAL
 717         .dir_notify = cifs_dir_notify,
 718 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 719 };
 720 const struct file_operations cifs_file_nobrl_ops = {
 721         .read = do_sync_read,
 722         .write = do_sync_write,
 723         .aio_read = generic_file_aio_read,
 724         .aio_write = cifs_file_aio_write,
 725         .open = cifs_open,
 726         .release = cifs_close,
 727         .fsync = cifs_fsync,
 728         .flush = cifs_flush,
 729         .mmap  = cifs_file_mmap,
 730         .splice_read = generic_file_splice_read,
 731         .llseek = cifs_llseek,
 732 #ifdef CONFIG_CIFS_POSIX
 733         .unlocked_ioctl = cifs_ioctl,
 734 #endif /* CONFIG_CIFS_POSIX */
 735
 736 #ifdef CONFIG_CIFS_EXPERIMENTAL
 737         .dir_notify = cifs_dir_notify,
 738 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 739 };
 740
 741 const struct file_operations cifs_file_direct_nobrl_ops = {
 742         /* no mmap, no aio, no readv -
 743            BB reevaluate whether they can be done with directio, no cache */
 744         .read = cifs_user_read,
 745         .write = cifs_user_write,
 746         .open = cifs_open,
 747         .release = cifs_close,
 748         .fsync = cifs_fsync,
 749         .flush = cifs_flush,
 750         .splice_read = generic_file_splice_read,
 751 #ifdef CONFIG_CIFS_POSIX
 752         .unlocked_ioctl  = cifs_ioctl,
 753 #endif /* CONFIG_CIFS_POSIX */
 754         .llseek = cifs_llseek,
 755 #ifdef CONFIG_CIFS_EXPERIMENTAL
 756         .dir_notify = cifs_dir_notify,
 757 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 758 };
 759
 760 const struct file_operations cifs_dir_ops = {
 761         .readdir = cifs_readdir,
 762         .release = cifs_closedir,
 763         .read    = generic_read_dir,
 764 #ifdef CONFIG_CIFS_EXPERIMENTAL
 765         .dir_notify = cifs_dir_notify,
 766 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 767         .unlocked_ioctl  = cifs_ioctl,
 768 };
 769
 770 static void
 771 cifs_init_once(struct kmem_cache *cachep, void *inode)
 772 {
 773         struct cifsInodeInfo *cifsi = inode;
 774
 775         inode_init_once(&cifsi->vfs_inode);
 776         INIT_LIST_HEAD(&cifsi->lockList);
 777 }
 778
 779 static int
 780 cifs_init_inodecache(void)
 781 {
 782         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
 783                                               sizeof(struct cifsInodeInfo),
 784                                               0, (SLAB_RECLAIM_ACCOUNT|
 785                                                 SLAB_MEM_SPREAD),
 786                                               cifs_init_once);
 787         if (cifs_inode_cachep == NULL)
 788                 return -ENOMEM;
 789
 790         return 0;
 791 }
 792
 793 static void
 794 cifs_destroy_inodecache(void)
 795 {
 796         kmem_cache_destroy(cifs_inode_cachep);
 797 }
 798
 799 static int
 800 cifs_init_request_bufs(void)
 801 {
 802         if (CIFSMaxBufSize < 8192) {
 803         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
 804         Unicode path name has to fit in any SMB/CIFS path based frames */
 805                 CIFSMaxBufSize = 8192;
 806         } else if (CIFSMaxBufSize > 1024*127) {
 807                 CIFSMaxBufSize = 1024 * 127;
 808         } else {
 809                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
 810         }
 811 /*      cERROR(1,("CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize)); */
 812         cifs_req_cachep = kmem_cache_create("cifs_request",
 813                                             CIFSMaxBufSize +
 814                                             MAX_CIFS_HDR_SIZE, 0,
 815                                             SLAB_HWCACHE_ALIGN, NULL);
 816         if (cifs_req_cachep == NULL)
 817                 return -ENOMEM;
 818
 819         if (cifs_min_rcv < 1)
 820                 cifs_min_rcv = 1;
 821         else if (cifs_min_rcv > 64) {
 822                 cifs_min_rcv = 64;
 823                 cERROR(1, ("cifs_min_rcv set to maximum (64)"));
 824         }
 825
 826         cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
 827                                                   cifs_req_cachep);
 828
 829         if (cifs_req_poolp == NULL) {
 830                 kmem_cache_destroy(cifs_req_cachep);
 831                 return -ENOMEM;
 832         }
 833         /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
 834         almost all handle based requests (but not write response, nor is it
 835         sufficient for path based requests).  A smaller size would have
 836         been more efficient (compacting multiple slab items on one 4k page)
 837         for the case in which debug was on, but this larger size allows
 838         more SMBs to use small buffer alloc and is still much more
 839         efficient to alloc 1 per page off the slab compared to 17K (5page)
 840         alloc of large cifs buffers even when page debugging is on */
 841         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
 842                         MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
 843                         NULL);
 844         if (cifs_sm_req_cachep == NULL) {
 845                 mempool_destroy(cifs_req_poolp);
 846                 kmem_cache_destroy(cifs_req_cachep);
 847                 return -ENOMEM;
 848         }
 849
 850         if (cifs_min_small < 2)
 851                 cifs_min_small = 2;
 852         else if (cifs_min_small > 256) {
 853                 cifs_min_small = 256;
 854                 cFYI(1, ("cifs_min_small set to maximum (256)"));
 855         }
 856
 857         cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
 858                                                      cifs_sm_req_cachep);
 859
 860         if (cifs_sm_req_poolp == NULL) {
 861                 mempool_destroy(cifs_req_poolp);
 862                 kmem_cache_destroy(cifs_req_cachep);
 863                 kmem_cache_destroy(cifs_sm_req_cachep);
 864                 return -ENOMEM;
 865         }
 866
 867         return 0;
 868 }
 869
 870 static void
 871 cifs_destroy_request_bufs(void)
 872 {
 873         mempool_destroy(cifs_req_poolp);
 874         kmem_cache_destroy(cifs_req_cachep);
 875         mempool_destroy(cifs_sm_req_poolp);
 876         kmem_cache_destroy(cifs_sm_req_cachep);
 877 }
 878
 879 static int
 880 cifs_init_mids(void)
 881 {
 882         cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
 883                                             sizeof(struct mid_q_entry), 0,
 884                                             SLAB_HWCACHE_ALIGN, NULL);
 885         if (cifs_mid_cachep == NULL)
 886                 return -ENOMEM;
 887
 888         /* 3 is a reasonable minimum number of simultaneous operations */
 889         cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
 890         if (cifs_mid_poolp == NULL) {
 891                 kmem_cache_destroy(cifs_mid_cachep);
 892                 return -ENOMEM;
 893         }
 894
 895         cifs_oplock_cachep = kmem_cache_create("cifs_oplock_structs",
 896                                         sizeof(struct oplock_q_entry), 0,
 897                                         SLAB_HWCACHE_ALIGN, NULL);
 898         if (cifs_oplock_cachep == NULL) {
 899                 mempool_destroy(cifs_mid_poolp);
 900                 kmem_cache_destroy(cifs_mid_cachep);
 901                 return -ENOMEM;
 902         }
 903
 904         return 0;
 905 }
 906
 907 static void
 908 cifs_destroy_mids(void)
 909 {
 910         mempool_destroy(cifs_mid_poolp);
 911         kmem_cache_destroy(cifs_mid_cachep);
 912         kmem_cache_destroy(cifs_oplock_cachep);
 913 }
 914
 915 static int cifs_oplock_thread(void *dummyarg)
 916 {
 917         struct oplock_q_entry *oplock_item;
 918         struct cifsTconInfo *pTcon;
 919         struct inode *inode;
 920         __u16  netfid;
 921         int rc, waitrc = 0;
 922
 923         set_freezable();
 924         do {
 925                 if (try_to_freeze())
 926                         continue;
 927
 928                 spin_lock(&GlobalMid_Lock);
 929                 if (list_empty(&GlobalOplock_Q)) {
 930                         spin_unlock(&GlobalMid_Lock);
 931                         set_current_state(TASK_INTERRUPTIBLE);
 932                         schedule_timeout(39*HZ);
 933                 } else {
 934                         oplock_item = list_entry(GlobalOplock_Q.next,
 935                                 struct oplock_q_entry, qhead);
 936                         if (oplock_item) {
 937                                 cFYI(1, ("found oplock item to write out"));
 938                                 pTcon = oplock_item->tcon;
 939                                 inode = oplock_item->pinode;
 940                                 netfid = oplock_item->netfid;
 941                                 spin_unlock(&GlobalMid_Lock);
 942                                 DeleteOplockQEntry(oplock_item);
 943                                 /* can not grab inode sem here since it would
 944                                 deadlock when oplock received on delete
 945                                 since vfs_unlink holds the i_mutex across
 946                                 the call */
 947                                 /* mutex_lock(&inode->i_mutex);*/
 948                                 if (S_ISREG(inode->i_mode)) {
 949                                         rc =
 950                                            filemap_fdatawrite(inode->i_mapping);
 951                                         if (CIFS_I(inode)->clientCanCacheRead
 952                                                                          == 0) {
 953                                                 waitrc = filemap_fdatawait(inode->i_mapping);
 954                                                 invalidate_remote_inode(inode);
 955                                         }
 956                                         if (rc == 0)
 957                                                 rc = waitrc;
 958                                 } else
 959                                         rc = 0;
 960                                 /* mutex_unlock(&inode->i_mutex);*/
 961                                 if (rc)
 962                                         CIFS_I(inode)->write_behind_rc = rc;
 963                                 cFYI(1, ("Oplock flush inode %p rc %d",
 964                                         inode, rc));
 965
 966                                 /* releasing stale oplock after recent reconnect
 967                                 of smb session using a now incorrect file
 968                                 handle is not a data integrity issue but do
 969                                 not bother sending an oplock release if session
 970                                 to server still is disconnected since oplock
 971                                 already released by the server in that case */
 972                                 if (pTcon->tidStatus != CifsNeedReconnect) {
 973                                     rc = CIFSSMBLock(0, pTcon, netfid,
 974                                             0 /* len */ , 0 /* offset */, 0,
 975                                             0, LOCKING_ANDX_OPLOCK_RELEASE,
 976                                             false /* wait flag */);
 977                                         cFYI(1, ("Oplock release rc = %d", rc));
 978                                 }
 979                         } else
 980                                 spin_unlock(&GlobalMid_Lock);
 981                         set_current_state(TASK_INTERRUPTIBLE);
 982                         schedule_timeout(1);  /* yield in case q were corrupt */
 983                 }
 984         } while (!kthread_should_stop());
 985
 986         return 0;
 987 }
 988
 989 static int cifs_dnotify_thread(void *dummyarg)
 990 {
 991         struct list_head *tmp;
 992         struct cifsSesInfo *ses;
 993
 994         do {
 995                 if (try_to_freeze())
 996                         continue;
 997                 set_current_state(TASK_INTERRUPTIBLE);
 998                 schedule_timeout(15*HZ);
 999                 read_lock(&GlobalSMBSeslock);
1000                 /* check if any stuck requests that need
1001                    to be woken up and wakeq so the
1002                    thread can wake up and error out */
1003                 list_for_each(tmp, &GlobalSMBSessionList) {
1004                         ses = list_entry(tmp, struct cifsSesInfo,
1005                                 cifsSessionList);
1006                         if (ses && ses->server &&
1007                              atomic_read(&ses->server->inFlight))
1008                                 wake_up_all(&ses->server->response_q);
1009                 }
1010                 read_unlock(&GlobalSMBSeslock);
1011         } while (!kthread_should_stop());
1012
1013         return 0;
1014 }
1015
1016 static int __init
1017 init_cifs(void)
1018 {
1019         int rc = 0;
1020         cifs_proc_init();
1021 /*      INIT_LIST_HEAD(&GlobalServerList);*/    /* BB not implemented yet */
1022         INIT_LIST_HEAD(&GlobalSMBSessionList);
1023         INIT_LIST_HEAD(&GlobalTreeConnectionList);
1024         INIT_LIST_HEAD(&GlobalOplock_Q);
1025 #ifdef CONFIG_CIFS_EXPERIMENTAL
1026         INIT_LIST_HEAD(&GlobalDnotifyReqList);
1027         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1028 #endif
1029 /*
1030  *  Initialize Global counters
1031  */
1032         atomic_set(&sesInfoAllocCount, 0);
1033         atomic_set(&tconInfoAllocCount, 0);
1034         atomic_set(&tcpSesAllocCount, 0);
1035         atomic_set(&tcpSesReconnectCount, 0);
1036         atomic_set(&tconInfoReconnectCount, 0);
1037
1038         atomic_set(&bufAllocCount, 0);
1039         atomic_set(&smBufAllocCount, 0);
1040 #ifdef CONFIG_CIFS_STATS2
1041         atomic_set(&totBufAllocCount, 0);
1042         atomic_set(&totSmBufAllocCount, 0);
1043 #endif /* CONFIG_CIFS_STATS2 */
1044
1045         atomic_set(&midCount, 0);
1046         GlobalCurrentXid = 0;
1047         GlobalTotalActiveXid = 0;
1048         GlobalMaxActiveXid = 0;
1049         memset(Local_System_Name, 0, 15);
1050         rwlock_init(&GlobalSMBSeslock);
1051         spin_lock_init(&GlobalMid_Lock);
1052
1053         if (cifs_max_pending < 2) {
1054                 cifs_max_pending = 2;
1055                 cFYI(1, ("cifs_max_pending set to min of 2"));
1056         } else if (cifs_max_pending > 256) {
1057                 cifs_max_pending = 256;
1058                 cFYI(1, ("cifs_max_pending set to max of 256"));
1059         }
1060
1061         rc = cifs_init_inodecache();
1062         if (rc)
1063                 goto out_clean_proc;
1064
1065         rc = cifs_init_mids();
1066         if (rc)
1067                 goto out_destroy_inodecache;
1068
1069         rc = cifs_init_request_bufs();
1070         if (rc)
1071                 goto out_destroy_mids;
1072
1073         rc = register_filesystem(&cifs_fs_type);
1074         if (rc)
1075                 goto out_destroy_request_bufs;
1076 #ifdef CONFIG_CIFS_UPCALL
1077         rc = register_key_type(&cifs_spnego_key_type);
1078         if (rc)
1079                 goto out_unregister_filesystem;
1080 #endif
1081 #ifdef CONFIG_CIFS_DFS_UPCALL
1082         rc = register_key_type(&key_type_dns_resolver);
1083         if (rc)
1084                 goto out_unregister_key_type;
1085 #endif
1086         oplockThread = kthread_run(cifs_oplock_thread, NULL, "cifsoplockd");
1087         if (IS_ERR(oplockThread)) {
1088                 rc = PTR_ERR(oplockThread);
1089                 cERROR(1, ("error %d create oplock thread", rc));
1090                 goto out_unregister_dfs_key_type;
1091         }
1092
1093         dnotifyThread = kthread_run(cifs_dnotify_thread, NULL, "cifsdnotifyd");
1094         if (IS_ERR(dnotifyThread)) {
1095                 rc = PTR_ERR(dnotifyThread);
1096                 cERROR(1, ("error %d create dnotify thread", rc));
1097                 goto out_stop_oplock_thread;
1098         }
1099
1100         return 0;
1101
1102  out_stop_oplock_thread:
1103         kthread_stop(oplockThread);
1104  out_unregister_dfs_key_type:
1105 #ifdef CONFIG_CIFS_DFS_UPCALL
1106         unregister_key_type(&key_type_dns_resolver);
1107  out_unregister_key_type:
1108 #endif
1109 #ifdef CONFIG_CIFS_UPCALL
1110         unregister_key_type(&cifs_spnego_key_type);
1111  out_unregister_filesystem:
1112 #endif
1113         unregister_filesystem(&cifs_fs_type);
1114  out_destroy_request_bufs:
1115         cifs_destroy_request_bufs();
1116  out_destroy_mids:
1117         cifs_destroy_mids();
1118  out_destroy_inodecache:
1119         cifs_destroy_inodecache();
1120  out_clean_proc:
1121         cifs_proc_clean();
1122         return rc;
1123 }
1124
1125 static void __exit
1126 exit_cifs(void)
1127 {
1128         cFYI(DBG2, ("exit_cifs"));
1129         cifs_proc_clean();
1130 #ifdef CONFIG_CIFS_DFS_UPCALL
1131         cifs_dfs_release_automount_timer();
1132         unregister_key_type(&key_type_dns_resolver);
1133 #endif
1134 #ifdef CONFIG_CIFS_UPCALL
1135         unregister_key_type(&cifs_spnego_key_type);
1136 #endif
1137         unregister_filesystem(&cifs_fs_type);
1138         cifs_destroy_inodecache();
1139         cifs_destroy_mids();
1140         cifs_destroy_request_bufs();
1141         kthread_stop(oplockThread);
1142         kthread_stop(dnotifyThread);
1143 }
1144
1145 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1146 MODULE_LICENSE("GPL");  /* combination of LGPL + GPL source behaves as GPL */
1147 MODULE_DESCRIPTION
1148     ("VFS to access servers complying with the SNIA CIFS Specification "
1149      "e.g. Samba and Windows");
1150 MODULE_VERSION(CIFS_VERSION);
1151 module_init(init_cifs)
1152 module_exit(exit_cifs)