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