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