fs/cifs/cifsfs.c

   1 /*
   2  *   fs/cifs/cifsfs.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2002,2008
   5  *   Author(s): Steve French (sfrench@us.ibm.com)
   6  *
   7  *   Common Internet FileSystem (CIFS) client
   8  *
   9  *   This library is free software; you can redistribute it and/or modify
  10  *   it under the terms of the GNU Lesser General Public License as published
  11  *   by the Free Software Foundation; either version 2.1 of the License, or
  12  *   (at your option) any later version.
  13  *
  14  *   This library is distributed in the hope that it will be useful,
  15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  17  *   the GNU Lesser General Public License for more details.
  18  *
  19  *   You should have received a copy of the GNU Lesser General Public License
  20  *   along with this library; if not, write to the Free Software
  21  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  */
  23
  24 /* Note that BB means BUGBUG (ie something to fix eventually) */
  25
  26 #include <linux/module.h>
  27 #include <linux/fs.h>
  28 #include <linux/mount.h>
  29 #include <linux/slab.h>
  30 #include <linux/init.h>
  31 #include <linux/list.h>
  32 #include <linux/seq_file.h>
  33 #include <linux/vfs.h>
  34 #include <linux/mempool.h>
  35 #include <linux/delay.h>
  36 #include <linux/kthread.h>
  37 #include <linux/freezer.h>
  38 #include <linux/smp_lock.h>
  39 #include "cifsfs.h"
  40 #include "cifspdu.h"
  41 #define DECLARE_GLOBALS_HERE
  42 #include "cifsglob.h"
  43 #include "cifsproto.h"
  44 #include "cifs_debug.h"
  45 #include "cifs_fs_sb.h"
  46 #include <linux/mm.h>
  47 #include <linux/key-type.h>
  48 #include "cifs_spnego.h"
  49 #include "fscache.h"
  50 #define CIFS_MAGIC_NUMBER 0xFF534D42    /* the first four bytes of SMB PDUs */
  51
  52 int cifsFYI = 0;
  53 int cifsERROR = 1;
  54 int traceSMB = 0;
  55 unsigned int oplockEnabled = 1;
  56 unsigned int experimEnabled = 0;
  57 unsigned int linuxExtEnabled = 1;
  58 unsigned int lookupCacheEnabled = 1;
  59 unsigned int multiuser_mount = 0;
  60 unsigned int global_secflags = CIFSSEC_DEF;
  61 /* unsigned int ntlmv2_support = 0; */
  62 unsigned int sign_CIFS_PDUs = 1;
  63 static const struct super_operations cifs_super_ops;
  64 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
  65 module_param(CIFSMaxBufSize, int, 0);
  66 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header). "
  67                                  "Default: 16384 Range: 8192 to 130048");
  68 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
  69 module_param(cifs_min_rcv, int, 0);
  70 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
  71                                 "1 to 64");
  72 unsigned int cifs_min_small = 30;
  73 module_param(cifs_min_small, int, 0);
  74 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
  75                                  "Range: 2 to 256");
  76 unsigned int cifs_max_pending = CIFS_MAX_REQ;
  77 module_param(cifs_max_pending, int, 0);
  78 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. "
  79                                    "Default: 50 Range: 2 to 256");
  80
  81 extern mempool_t *cifs_sm_req_poolp;
  82 extern mempool_t *cifs_req_poolp;
  83 extern mempool_t *cifs_mid_poolp;
  84
  85 static int
  86 cifs_read_super(struct super_block *sb, void *data,
  87                 const char *devname, int silent)
  88 {
  89         struct inode *inode;
  90         struct cifs_sb_info *cifs_sb;
  91         int rc = 0;
  92
  93         /* BB should we make this contingent on mount parm? */
  94         sb->s_flags |= MS_NODIRATIME | MS_NOATIME;
  95         sb->s_fs_info = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
  96         cifs_sb = CIFS_SB(sb);
  97         if (cifs_sb == NULL)
  98                 return -ENOMEM;
  99
 100         rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs", BDI_CAP_MAP_COPY);
 101         if (rc) {
 102                 kfree(cifs_sb);
 103                 return rc;
 104         }
 105
 106 #ifdef CONFIG_CIFS_DFS_UPCALL
 107         /* copy mount params to sb for use in submounts */
 108         /* BB: should we move this after the mount so we
 109          * do not have to do the copy on failed mounts?
 110          * BB: May be it is better to do simple copy before
 111          * complex operation (mount), and in case of fail
 112          * just exit instead of doing mount and attempting
 113          * undo it if this copy fails?*/
 114         if (data) {
 115                 int len = strlen(data);
 116                 cifs_sb->mountdata = kzalloc(len + 1, GFP_KERNEL);
 117                 if (cifs_sb->mountdata == NULL) {
 118                         bdi_destroy(&cifs_sb->bdi);
 119                         kfree(sb->s_fs_info);
 120                         sb->s_fs_info = NULL;
 121                         return -ENOMEM;
 122                 }
 123                 strncpy(cifs_sb->mountdata, data, len + 1);
 124                 cifs_sb->mountdata[len] = '\0';
 125         }
 126 #endif
 127
 128         rc = cifs_mount(sb, cifs_sb, data, devname);
 129
 130         if (rc) {
 131                 if (!silent)
 132                         cERROR(1, "cifs_mount failed w/return code = %d", rc);
 133                 goto out_mount_failed;
 134         }
 135
 136         sb->s_magic = CIFS_MAGIC_NUMBER;
 137         sb->s_op = &cifs_super_ops;
 138         sb->s_bdi = &cifs_sb->bdi;
 139 /*      if (cifs_sb->tcon->ses->server->maxBuf > MAX_CIFS_HDR_SIZE + 512)
 140             sb->s_blocksize =
 141                 cifs_sb->tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE; */
 142         sb->s_blocksize = CIFS_MAX_MSGSIZE;
 143         sb->s_blocksize_bits = 14;      /* default 2**14 = CIFS_MAX_MSGSIZE */
 144         inode = cifs_root_iget(sb, ROOT_I);
 145
 146         if (IS_ERR(inode)) {
 147                 rc = PTR_ERR(inode);
 148                 inode = NULL;
 149                 goto out_no_root;
 150         }
 151
 152         sb->s_root = d_alloc_root(inode);
 153
 154         if (!sb->s_root) {
 155                 rc = -ENOMEM;
 156                 goto out_no_root;
 157         }
 158
 159 #ifdef CONFIG_CIFS_EXPERIMENTAL
 160         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 161                 cFYI(1, "export ops supported");
 162                 sb->s_export_op = &cifs_export_ops;
 163         }
 164 #endif /* EXPERIMENTAL */
 165
 166         return 0;
 167
 168 out_no_root:
 169         cERROR(1, "cifs_read_super: get root inode failed");
 170         if (inode)
 171                 iput(inode);
 172
 173         cifs_umount(sb, cifs_sb);
 174
 175 out_mount_failed:
 176         if (cifs_sb) {
 177 #ifdef CONFIG_CIFS_DFS_UPCALL
 178                 if (cifs_sb->mountdata) {
 179                         kfree(cifs_sb->mountdata);
 180                         cifs_sb->mountdata = NULL;
 181                 }
 182 #endif
 183                 unload_nls(cifs_sb->local_nls);
 184                 bdi_destroy(&cifs_sb->bdi);
 185                 kfree(cifs_sb);
 186         }
 187         return rc;
 188 }
 189
 190 static void
 191 cifs_put_super(struct super_block *sb)
 192 {
 193         int rc = 0;
 194         struct cifs_sb_info *cifs_sb;
 195
 196         cFYI(1, "In cifs_put_super");
 197         cifs_sb = CIFS_SB(sb);
 198         if (cifs_sb == NULL) {
 199                 cFYI(1, "Empty cifs superblock info passed to unmount");
 200                 return;
 201         }
 202
 203         lock_kernel();
 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         bdi_destroy(&cifs_sb->bdi);
 217         kfree(cifs_sb);
 218
 219         unlock_kernel();
 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 static struct kmem_cache *cifs_sm_req_cachep;
 294 mempool_t *cifs_sm_req_poolp;
 295 mempool_t *cifs_req_poolp;
 296 mempool_t *cifs_mid_poolp;
 297
 298 static struct inode *
 299 cifs_alloc_inode(struct super_block *sb)
 300 {
 301         struct cifsInodeInfo *cifs_inode;
 302         cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
 303         if (!cifs_inode)
 304                 return NULL;
 305         cifs_inode->cifsAttrs = 0x20;   /* default */
 306         cifs_inode->time = 0;
 307         cifs_inode->write_behind_rc = 0;
 308         /* Until the file is open and we have gotten oplock
 309         info back from the server, can not assume caching of
 310         file data or metadata */
 311         cifs_inode->clientCanCacheRead = false;
 312         cifs_inode->clientCanCacheAll = false;
 313         cifs_inode->delete_pending = false;
 314         cifs_inode->invalid_mapping = false;
 315         cifs_inode->vfs_inode.i_blkbits = 14;  /* 2**14 = CIFS_MAX_MSGSIZE */
 316         cifs_inode->server_eof = 0;
 317
 318         /* Can not set i_flags here - they get immediately overwritten
 319            to zero by the VFS */
 320 /*      cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;*/
 321         INIT_LIST_HEAD(&cifs_inode->openFileList);
 322         return &cifs_inode->vfs_inode;
 323 }
 324
 325 static void
 326 cifs_destroy_inode(struct inode *inode)
 327 {
 328         kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
 329 }
 330
 331 static void
 332 cifs_clear_inode(struct inode *inode)
 333 {
 334         cifs_fscache_release_inode_cookie(inode);
 335 }
 336
 337 static void
 338 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
 339 {
 340         seq_printf(s, ",addr=");
 341
 342         switch (server->addr.sockAddr.sin_family) {
 343         case AF_INET:
 344                 seq_printf(s, "%pI4", &server->addr.sockAddr.sin_addr.s_addr);
 345                 break;
 346         case AF_INET6:
 347                 seq_printf(s, "%pI6",
 348                            &server->addr.sockAddr6.sin6_addr.s6_addr);
 349                 if (server->addr.sockAddr6.sin6_scope_id)
 350                         seq_printf(s, "%%%u",
 351                                    server->addr.sockAddr6.sin6_scope_id);
 352                 break;
 353         default:
 354                 seq_printf(s, "(unknown)");
 355         }
 356 }
 357
 358 /*
 359  * cifs_show_options() is for displaying mount options in /proc/mounts.
 360  * Not all settable options are displayed but most of the important
 361  * ones are.
 362  */
 363 static int
 364 cifs_show_options(struct seq_file *s, struct vfsmount *m)
 365 {
 366         struct cifs_sb_info *cifs_sb = CIFS_SB(m->mnt_sb);
 367         struct cifsTconInfo *tcon = cifs_sb->tcon;
 368
 369         seq_printf(s, ",unc=%s", tcon->treeName);
 370         if (tcon->ses->userName)
 371                 seq_printf(s, ",username=%s", tcon->ses->userName);
 372         if (tcon->ses->domainName)
 373                 seq_printf(s, ",domain=%s", tcon->ses->domainName);
 374
 375         seq_printf(s, ",uid=%d", cifs_sb->mnt_uid);
 376         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
 377                 seq_printf(s, ",forceuid");
 378         else
 379                 seq_printf(s, ",noforceuid");
 380
 381         seq_printf(s, ",gid=%d", cifs_sb->mnt_gid);
 382         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
 383                 seq_printf(s, ",forcegid");
 384         else
 385                 seq_printf(s, ",noforcegid");
 386
 387         cifs_show_address(s, tcon->ses->server);
 388
 389         if (!tcon->unix_ext)
 390                 seq_printf(s, ",file_mode=0%o,dir_mode=0%o",
 391                                            cifs_sb->mnt_file_mode,
 392                                            cifs_sb->mnt_dir_mode);
 393         if (tcon->seal)
 394                 seq_printf(s, ",seal");
 395         if (tcon->nocase)
 396                 seq_printf(s, ",nocase");
 397         if (tcon->retry)
 398                 seq_printf(s, ",hard");
 399         if (cifs_sb->prepath)
 400                 seq_printf(s, ",prepath=%s", cifs_sb->prepath);
 401         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 402                 seq_printf(s, ",posixpaths");
 403         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
 404                 seq_printf(s, ",setuids");
 405         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 406                 seq_printf(s, ",serverino");
 407         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
 408                 seq_printf(s, ",directio");
 409         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 410                 seq_printf(s, ",nouser_xattr");
 411         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 412                 seq_printf(s, ",mapchars");
 413         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
 414                 seq_printf(s, ",sfu");
 415         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 416                 seq_printf(s, ",nobrl");
 417         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
 418                 seq_printf(s, ",cifsacl");
 419         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
 420                 seq_printf(s, ",dynperm");
 421         if (m->mnt_sb->s_flags & MS_POSIXACL)
 422                 seq_printf(s, ",acl");
 423
 424         seq_printf(s, ",rsize=%d", cifs_sb->rsize);
 425         seq_printf(s, ",wsize=%d", cifs_sb->wsize);
 426
 427         return 0;
 428 }
 429
 430 static void cifs_umount_begin(struct super_block *sb)
 431 {
 432         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 433         struct cifsTconInfo *tcon;
 434
 435         if (cifs_sb == NULL)
 436                 return;
 437
 438         tcon = cifs_sb->tcon;
 439         if (tcon == NULL)
 440                 return;
 441
 442         read_lock(&cifs_tcp_ses_lock);
 443         if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
 444                 /* we have other mounts to same share or we have
 445                    already tried to force umount this and woken up
 446                    all waiting network requests, nothing to do */
 447                 read_unlock(&cifs_tcp_ses_lock);
 448                 return;
 449         } else if (tcon->tc_count == 1)
 450                 tcon->tidStatus = CifsExiting;
 451         read_unlock(&cifs_tcp_ses_lock);
 452
 453         /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
 454         /* cancel_notify_requests(tcon); */
 455         if (tcon->ses && tcon->ses->server) {
 456                 cFYI(1, "wake up tasks now - umount begin not complete");
 457                 wake_up_all(&tcon->ses->server->request_q);
 458                 wake_up_all(&tcon->ses->server->response_q);
 459                 msleep(1); /* yield */
 460                 /* we have to kick the requests once more */
 461                 wake_up_all(&tcon->ses->server->response_q);
 462                 msleep(1);
 463         }
 464
 465         return;
 466 }
 467
 468 #ifdef CONFIG_CIFS_STATS2
 469 static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt)
 470 {
 471         /* BB FIXME */
 472         return 0;
 473 }
 474 #endif
 475
 476 static int cifs_remount(struct super_block *sb, int *flags, char *data)
 477 {
 478         *flags |= MS_NODIRATIME;
 479         return 0;
 480 }
 481
 482 void cifs_drop_inode(struct inode *inode)
 483 {
 484         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 485
 486         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 487                 return generic_drop_inode(inode);
 488
 489         return generic_delete_inode(inode);
 490 }
 491
 492 static const struct super_operations cifs_super_ops = {
 493         .put_super = cifs_put_super,
 494         .statfs = cifs_statfs,
 495         .alloc_inode = cifs_alloc_inode,
 496         .destroy_inode = cifs_destroy_inode,
 497         .drop_inode     = cifs_drop_inode,
 498         .clear_inode    = cifs_clear_inode,
 499 /*      .delete_inode   = cifs_delete_inode,  */  /* Do not need above
 500         function unless later we add lazy close of inodes or unless the
 501         kernel forgets to call us with the same number of releases (closes)
 502         as opens */
 503         .show_options = cifs_show_options,
 504         .umount_begin   = cifs_umount_begin,
 505         .remount_fs = cifs_remount,
 506 #ifdef CONFIG_CIFS_STATS2
 507         .show_stats = cifs_show_stats,
 508 #endif
 509 };
 510
 511 static int
 512 cifs_get_sb(struct file_system_type *fs_type,
 513             int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 514 {
 515         int rc;
 516         struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);
 517
 518         cFYI(1, "Devname: %s flags: %d ", dev_name, flags);
 519
 520         if (IS_ERR(sb))
 521                 return PTR_ERR(sb);
 522
 523         sb->s_flags = flags;
 524
 525         rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
 526         if (rc) {
 527                 deactivate_locked_super(sb);
 528                 return rc;
 529         }
 530         sb->s_flags |= MS_ACTIVE;
 531         simple_set_mnt(mnt, sb);
 532         return 0;
 533 }
 534
 535 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 536                                    unsigned long nr_segs, loff_t pos)
 537 {
 538         struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
 539         ssize_t written;
 540
 541         written = generic_file_aio_write(iocb, iov, nr_segs, pos);
 542         if (!CIFS_I(inode)->clientCanCacheAll)
 543                 filemap_fdatawrite(inode->i_mapping);
 544         return written;
 545 }
 546
 547 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
 548 {
 549         /* origin == SEEK_END => we must revalidate the cached file length */
 550         if (origin == SEEK_END) {
 551                 int retval;
 552
 553                 /* some applications poll for the file length in this strange
 554                    way so we must seek to end on non-oplocked files by
 555                    setting the revalidate time to zero */
 556                 CIFS_I(file->f_path.dentry->d_inode)->time = 0;
 557
 558                 retval = cifs_revalidate_file(file);
 559                 if (retval < 0)
 560                         return (loff_t)retval;
 561         }
 562         return generic_file_llseek_unlocked(file, offset, origin);
 563 }
 564
 565 static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
 566 {
 567         /* note that this is called by vfs setlease with the BKL held
 568            although I doubt that BKL is needed here in cifs */
 569         struct inode *inode = file->f_path.dentry->d_inode;
 570
 571         if (!(S_ISREG(inode->i_mode)))
 572                 return -EINVAL;
 573
 574         /* check if file is oplocked */
 575         if (((arg == F_RDLCK) &&
 576                 (CIFS_I(inode)->clientCanCacheRead)) ||
 577             ((arg == F_WRLCK) &&
 578                 (CIFS_I(inode)->clientCanCacheAll)))
 579                 return generic_setlease(file, arg, lease);
 580         else if (CIFS_SB(inode->i_sb)->tcon->local_lease &&
 581                         !CIFS_I(inode)->clientCanCacheRead)
 582                 /* If the server claims to support oplock on this
 583                    file, then we still need to check oplock even
 584                    if the local_lease mount option is set, but there
 585                    are servers which do not support oplock for which
 586                    this mount option may be useful if the user
 587                    knows that the file won't be changed on the server
 588                    by anyone else */
 589                 return generic_setlease(file, arg, lease);
 590         else
 591                 return -EAGAIN;
 592 }
 593
 594 struct file_system_type cifs_fs_type = {
 595         .owner = THIS_MODULE,
 596         .name = "cifs",
 597         .get_sb = cifs_get_sb,
 598         .kill_sb = kill_anon_super,
 599         /*  .fs_flags */
 600 };
 601 const struct inode_operations cifs_dir_inode_ops = {
 602         .create = cifs_create,
 603         .lookup = cifs_lookup,
 604         .getattr = cifs_getattr,
 605         .unlink = cifs_unlink,
 606         .link = cifs_hardlink,
 607         .mkdir = cifs_mkdir,
 608         .rmdir = cifs_rmdir,
 609         .rename = cifs_rename,
 610         .permission = cifs_permission,
 611 /*      revalidate:cifs_revalidate,   */
 612         .setattr = cifs_setattr,
 613         .symlink = cifs_symlink,
 614         .mknod   = cifs_mknod,
 615 #ifdef CONFIG_CIFS_XATTR
 616         .setxattr = cifs_setxattr,
 617         .getxattr = cifs_getxattr,
 618         .listxattr = cifs_listxattr,
 619         .removexattr = cifs_removexattr,
 620 #endif
 621 };
 622
 623 const struct inode_operations cifs_file_inode_ops = {
 624 /*      revalidate:cifs_revalidate, */
 625         .setattr = cifs_setattr,
 626         .getattr = cifs_getattr, /* do we need this anymore? */
 627         .rename = cifs_rename,
 628         .permission = cifs_permission,
 629 #ifdef CONFIG_CIFS_XATTR
 630         .setxattr = cifs_setxattr,
 631         .getxattr = cifs_getxattr,
 632         .listxattr = cifs_listxattr,
 633         .removexattr = cifs_removexattr,
 634 #endif
 635 };
 636
 637 const struct inode_operations cifs_symlink_inode_ops = {
 638         .readlink = generic_readlink,
 639         .follow_link = cifs_follow_link,
 640         .put_link = cifs_put_link,
 641         .permission = cifs_permission,
 642         /* BB add the following two eventually */
 643         /* revalidate: cifs_revalidate,
 644            setattr:    cifs_notify_change, *//* BB do we need notify change */
 645 #ifdef CONFIG_CIFS_XATTR
 646         .setxattr = cifs_setxattr,
 647         .getxattr = cifs_getxattr,
 648         .listxattr = cifs_listxattr,
 649         .removexattr = cifs_removexattr,
 650 #endif
 651 };
 652
 653 const struct file_operations cifs_file_ops = {
 654         .read = do_sync_read,
 655         .write = do_sync_write,
 656         .aio_read = generic_file_aio_read,
 657         .aio_write = cifs_file_aio_write,
 658         .open = cifs_open,
 659         .release = cifs_close,
 660         .lock = cifs_lock,
 661         .fsync = cifs_fsync,
 662         .flush = cifs_flush,
 663         .mmap  = cifs_file_mmap,
 664         .splice_read = generic_file_splice_read,
 665         .llseek = cifs_llseek,
 666 #ifdef CONFIG_CIFS_POSIX
 667         .unlocked_ioctl = cifs_ioctl,
 668 #endif /* CONFIG_CIFS_POSIX */
 669         .setlease = cifs_setlease,
 670 };
 671
 672 const struct file_operations cifs_file_direct_ops = {
 673         /* no aio, no readv -
 674            BB reevaluate whether they can be done with directio, no cache */
 675         .read = cifs_user_read,
 676         .write = cifs_user_write,
 677         .open = cifs_open,
 678         .release = cifs_close,
 679         .lock = cifs_lock,
 680         .fsync = cifs_fsync,
 681         .flush = cifs_flush,
 682         .mmap = cifs_file_mmap,
 683         .splice_read = generic_file_splice_read,
 684 #ifdef CONFIG_CIFS_POSIX
 685         .unlocked_ioctl  = cifs_ioctl,
 686 #endif /* CONFIG_CIFS_POSIX */
 687         .llseek = cifs_llseek,
 688         .setlease = cifs_setlease,
 689 };
 690 const struct file_operations cifs_file_nobrl_ops = {
 691         .read = do_sync_read,
 692         .write = do_sync_write,
 693         .aio_read = generic_file_aio_read,
 694         .aio_write = cifs_file_aio_write,
 695         .open = cifs_open,
 696         .release = cifs_close,
 697         .fsync = cifs_fsync,
 698         .flush = cifs_flush,
 699         .mmap  = cifs_file_mmap,
 700         .splice_read = generic_file_splice_read,
 701         .llseek = cifs_llseek,
 702 #ifdef CONFIG_CIFS_POSIX
 703         .unlocked_ioctl = cifs_ioctl,
 704 #endif /* CONFIG_CIFS_POSIX */
 705         .setlease = cifs_setlease,
 706 };
 707
 708 const struct file_operations cifs_file_direct_nobrl_ops = {
 709         /* no mmap, no aio, no readv -
 710            BB reevaluate whether they can be done with directio, no cache */
 711         .read = cifs_user_read,
 712         .write = cifs_user_write,
 713         .open = cifs_open,
 714         .release = cifs_close,
 715         .fsync = cifs_fsync,
 716         .flush = cifs_flush,
 717         .mmap = cifs_file_mmap,
 718         .splice_read = generic_file_splice_read,
 719 #ifdef CONFIG_CIFS_POSIX
 720         .unlocked_ioctl  = cifs_ioctl,
 721 #endif /* CONFIG_CIFS_POSIX */
 722         .llseek = cifs_llseek,
 723         .setlease = cifs_setlease,
 724 };
 725
 726 const struct file_operations cifs_dir_ops = {
 727         .readdir = cifs_readdir,
 728         .release = cifs_closedir,
 729         .read    = generic_read_dir,
 730         .unlocked_ioctl  = cifs_ioctl,
 731         .llseek = generic_file_llseek,
 732 };
 733
 734 static void
 735 cifs_init_once(void *inode)
 736 {
 737         struct cifsInodeInfo *cifsi = inode;
 738
 739         inode_init_once(&cifsi->vfs_inode);
 740         INIT_LIST_HEAD(&cifsi->lockList);
 741 }
 742
 743 static int
 744 cifs_init_inodecache(void)
 745 {
 746         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
 747                                               sizeof(struct cifsInodeInfo),
 748                                               0, (SLAB_RECLAIM_ACCOUNT|
 749                                                 SLAB_MEM_SPREAD),
 750                                               cifs_init_once);
 751         if (cifs_inode_cachep == NULL)
 752                 return -ENOMEM;
 753
 754         return 0;
 755 }
 756
 757 static void
 758 cifs_destroy_inodecache(void)
 759 {
 760         kmem_cache_destroy(cifs_inode_cachep);
 761 }
 762
 763 static int
 764 cifs_init_request_bufs(void)
 765 {
 766         if (CIFSMaxBufSize < 8192) {
 767         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
 768         Unicode path name has to fit in any SMB/CIFS path based frames */
 769                 CIFSMaxBufSize = 8192;
 770         } else if (CIFSMaxBufSize > 1024*127) {
 771                 CIFSMaxBufSize = 1024 * 127;
 772         } else {
 773                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
 774         }
 775 /*      cERROR(1, "CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize); */
 776         cifs_req_cachep = kmem_cache_create("cifs_request",
 777                                             CIFSMaxBufSize +
 778                                             MAX_CIFS_HDR_SIZE, 0,
 779                                             SLAB_HWCACHE_ALIGN, NULL);
 780         if (cifs_req_cachep == NULL)
 781                 return -ENOMEM;
 782
 783         if (cifs_min_rcv < 1)
 784                 cifs_min_rcv = 1;
 785         else if (cifs_min_rcv > 64) {
 786                 cifs_min_rcv = 64;
 787                 cERROR(1, "cifs_min_rcv set to maximum (64)");
 788         }
 789
 790         cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
 791                                                   cifs_req_cachep);
 792
 793         if (cifs_req_poolp == NULL) {
 794                 kmem_cache_destroy(cifs_req_cachep);
 795                 return -ENOMEM;
 796         }
 797         /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
 798         almost all handle based requests (but not write response, nor is it
 799         sufficient for path based requests).  A smaller size would have
 800         been more efficient (compacting multiple slab items on one 4k page)
 801         for the case in which debug was on, but this larger size allows
 802         more SMBs to use small buffer alloc and is still much more
 803         efficient to alloc 1 per page off the slab compared to 17K (5page)
 804         alloc of large cifs buffers even when page debugging is on */
 805         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
 806                         MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
 807                         NULL);
 808         if (cifs_sm_req_cachep == NULL) {
 809                 mempool_destroy(cifs_req_poolp);
 810                 kmem_cache_destroy(cifs_req_cachep);
 811                 return -ENOMEM;
 812         }
 813
 814         if (cifs_min_small < 2)
 815                 cifs_min_small = 2;
 816         else if (cifs_min_small > 256) {
 817                 cifs_min_small = 256;
 818                 cFYI(1, "cifs_min_small set to maximum (256)");
 819         }
 820
 821         cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
 822                                                      cifs_sm_req_cachep);
 823
 824         if (cifs_sm_req_poolp == NULL) {
 825                 mempool_destroy(cifs_req_poolp);
 826                 kmem_cache_destroy(cifs_req_cachep);
 827                 kmem_cache_destroy(cifs_sm_req_cachep);
 828                 return -ENOMEM;
 829         }
 830
 831         return 0;
 832 }
 833
 834 static void
 835 cifs_destroy_request_bufs(void)
 836 {
 837         mempool_destroy(cifs_req_poolp);
 838         kmem_cache_destroy(cifs_req_cachep);
 839         mempool_destroy(cifs_sm_req_poolp);
 840         kmem_cache_destroy(cifs_sm_req_cachep);
 841 }
 842
 843 static int
 844 cifs_init_mids(void)
 845 {
 846         cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
 847                                             sizeof(struct mid_q_entry), 0,
 848                                             SLAB_HWCACHE_ALIGN, NULL);
 849         if (cifs_mid_cachep == NULL)
 850                 return -ENOMEM;
 851
 852         /* 3 is a reasonable minimum number of simultaneous operations */
 853         cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
 854         if (cifs_mid_poolp == NULL) {
 855                 kmem_cache_destroy(cifs_mid_cachep);
 856                 return -ENOMEM;
 857         }
 858
 859         return 0;
 860 }
 861
 862 static void
 863 cifs_destroy_mids(void)
 864 {
 865         mempool_destroy(cifs_mid_poolp);
 866         kmem_cache_destroy(cifs_mid_cachep);
 867 }
 868
 869 static int __init
 870 init_cifs(void)
 871 {
 872         int rc = 0;
 873         cifs_proc_init();
 874         INIT_LIST_HEAD(&cifs_tcp_ses_list);
 875 #ifdef CONFIG_CIFS_EXPERIMENTAL
 876         INIT_LIST_HEAD(&GlobalDnotifyReqList);
 877         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
 878 #endif
 879 /*
 880  *  Initialize Global counters
 881  */
 882         atomic_set(&sesInfoAllocCount, 0);
 883         atomic_set(&tconInfoAllocCount, 0);
 884         atomic_set(&tcpSesAllocCount, 0);
 885         atomic_set(&tcpSesReconnectCount, 0);
 886         atomic_set(&tconInfoReconnectCount, 0);
 887
 888         atomic_set(&bufAllocCount, 0);
 889         atomic_set(&smBufAllocCount, 0);
 890 #ifdef CONFIG_CIFS_STATS2
 891         atomic_set(&totBufAllocCount, 0);
 892         atomic_set(&totSmBufAllocCount, 0);
 893 #endif /* CONFIG_CIFS_STATS2 */
 894
 895         atomic_set(&midCount, 0);
 896         GlobalCurrentXid = 0;
 897         GlobalTotalActiveXid = 0;
 898         GlobalMaxActiveXid = 0;
 899         memset(Local_System_Name, 0, 15);
 900         rwlock_init(&GlobalSMBSeslock);
 901         rwlock_init(&cifs_tcp_ses_lock);
 902         spin_lock_init(&GlobalMid_Lock);
 903
 904         if (cifs_max_pending < 2) {
 905                 cifs_max_pending = 2;
 906                 cFYI(1, "cifs_max_pending set to min of 2");
 907         } else if (cifs_max_pending > 256) {
 908                 cifs_max_pending = 256;
 909                 cFYI(1, "cifs_max_pending set to max of 256");
 910         }
 911
 912         rc = cifs_fscache_register();
 913         if (rc)
 914                 goto out;
 915
 916         rc = cifs_init_inodecache();
 917         if (rc)
 918                 goto out_clean_proc;
 919
 920         rc = cifs_init_mids();
 921         if (rc)
 922                 goto out_destroy_inodecache;
 923
 924         rc = cifs_init_request_bufs();
 925         if (rc)
 926                 goto out_destroy_mids;
 927
 928         rc = register_filesystem(&cifs_fs_type);
 929         if (rc)
 930                 goto out_destroy_request_bufs;
 931 #ifdef CONFIG_CIFS_UPCALL
 932         rc = register_key_type(&cifs_spnego_key_type);
 933         if (rc)
 934                 goto out_unregister_filesystem;
 935 #endif
 936
 937         return 0;
 938
 939 #ifdef CONFIG_CIFS_UPCALL
 940  out_unregister_filesystem:
 941         unregister_filesystem(&cifs_fs_type);
 942 #endif
 943  out_destroy_request_bufs:
 944         cifs_destroy_request_bufs();
 945  out_destroy_mids:
 946         cifs_destroy_mids();
 947  out_destroy_inodecache:
 948         cifs_destroy_inodecache();
 949  out_clean_proc:
 950         cifs_proc_clean();
 951         cifs_fscache_unregister();
 952  out:
 953         return rc;
 954 }
 955
 956 static void __exit
 957 exit_cifs(void)
 958 {
 959         cFYI(DBG2, "exit_cifs");
 960         cifs_proc_clean();
 961         cifs_fscache_unregister();
 962 #ifdef CONFIG_CIFS_DFS_UPCALL
 963         cifs_dfs_release_automount_timer();
 964 #endif
 965 #ifdef CONFIG_CIFS_UPCALL
 966         unregister_key_type(&cifs_spnego_key_type);
 967 #endif
 968         unregister_filesystem(&cifs_fs_type);
 969         cifs_destroy_inodecache();
 970         cifs_destroy_mids();
 971         cifs_destroy_request_bufs();
 972 }
 973
 974 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
 975 MODULE_LICENSE("GPL");  /* combination of LGPL + GPL source behaves as GPL */
 976 MODULE_DESCRIPTION
 977     ("VFS to access servers complying with the SNIA CIFS Specification "
 978      "e.g. Samba and Windows");
 979 MODULE_VERSION(CIFS_VERSION);
 980 module_init(init_cifs)
 981 module_exit(exit_cifs)