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