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 <net/ipv6.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 void
  86 cifs_sb_active(struct super_block *sb)
  87 {
  88         struct cifs_sb_info *server = CIFS_SB(sb);
  89
  90         if (atomic_inc_return(&server->active) == 1)
  91                 atomic_inc(&sb->s_active);
  92 }
  93
  94 void
  95 cifs_sb_deactive(struct super_block *sb)
  96 {
  97         struct cifs_sb_info *server = CIFS_SB(sb);
  98
  99         if (atomic_dec_and_test(&server->active))
 100                 deactivate_super(sb);
 101 }
 102
 103 static int
 104 cifs_read_super(struct super_block *sb, void *data,
 105                 const char *devname, int silent)
 106 {
 107         struct inode *inode;
 108         struct cifs_sb_info *cifs_sb;
 109         int rc = 0;
 110
 111         /* BB should we make this contingent on mount parm? */
 112         sb->s_flags |= MS_NODIRATIME | MS_NOATIME;
 113         sb->s_fs_info = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
 114         cifs_sb = CIFS_SB(sb);
 115         if (cifs_sb == NULL)
 116                 return -ENOMEM;
 117
 118         spin_lock_init(&cifs_sb->tlink_tree_lock);
 119         cifs_sb->tlink_tree = RB_ROOT;
 120
 121         rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs", BDI_CAP_MAP_COPY);
 122         if (rc) {
 123                 kfree(cifs_sb);
 124                 return rc;
 125         }
 126
 127 #ifdef CONFIG_CIFS_DFS_UPCALL
 128         /* copy mount params to sb for use in submounts */
 129         /* BB: should we move this after the mount so we
 130          * do not have to do the copy on failed mounts?
 131          * BB: May be it is better to do simple copy before
 132          * complex operation (mount), and in case of fail
 133          * just exit instead of doing mount and attempting
 134          * undo it if this copy fails?*/
 135         if (data) {
 136                 int len = strlen(data);
 137                 cifs_sb->mountdata = kzalloc(len + 1, GFP_KERNEL);
 138                 if (cifs_sb->mountdata == NULL) {
 139                         bdi_destroy(&cifs_sb->bdi);
 140                         kfree(sb->s_fs_info);
 141                         sb->s_fs_info = NULL;
 142                         return -ENOMEM;
 143                 }
 144                 strncpy(cifs_sb->mountdata, data, len + 1);
 145                 cifs_sb->mountdata[len] = '\0';
 146         }
 147 #endif
 148
 149         rc = cifs_mount(sb, cifs_sb, data, devname);
 150
 151         if (rc) {
 152                 if (!silent)
 153                         cERROR(1, "cifs_mount failed w/return code = %d", rc);
 154                 goto out_mount_failed;
 155         }
 156
 157         sb->s_magic = CIFS_MAGIC_NUMBER;
 158         sb->s_op = &cifs_super_ops;
 159         sb->s_bdi = &cifs_sb->bdi;
 160         sb->s_blocksize = CIFS_MAX_MSGSIZE;
 161         sb->s_blocksize_bits = 14;      /* default 2**14 = CIFS_MAX_MSGSIZE */
 162         inode = cifs_root_iget(sb, ROOT_I);
 163
 164         if (IS_ERR(inode)) {
 165                 rc = PTR_ERR(inode);
 166                 inode = NULL;
 167                 goto out_no_root;
 168         }
 169
 170         sb->s_root = d_alloc_root(inode);
 171
 172         if (!sb->s_root) {
 173                 rc = -ENOMEM;
 174                 goto out_no_root;
 175         }
 176
 177 #ifdef CONFIG_CIFS_EXPERIMENTAL
 178         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 179                 cFYI(1, "export ops supported");
 180                 sb->s_export_op = &cifs_export_ops;
 181         }
 182 #endif /* EXPERIMENTAL */
 183
 184         return 0;
 185
 186 out_no_root:
 187         cERROR(1, "cifs_read_super: get root inode failed");
 188         if (inode)
 189                 iput(inode);
 190
 191         cifs_umount(sb, cifs_sb);
 192
 193 out_mount_failed:
 194         if (cifs_sb) {
 195 #ifdef CONFIG_CIFS_DFS_UPCALL
 196                 if (cifs_sb->mountdata) {
 197                         kfree(cifs_sb->mountdata);
 198                         cifs_sb->mountdata = NULL;
 199                 }
 200 #endif
 201                 unload_nls(cifs_sb->local_nls);
 202                 bdi_destroy(&cifs_sb->bdi);
 203                 kfree(cifs_sb);
 204         }
 205         return rc;
 206 }
 207
 208 static void
 209 cifs_put_super(struct super_block *sb)
 210 {
 211         int rc = 0;
 212         struct cifs_sb_info *cifs_sb;
 213
 214         cFYI(1, "In cifs_put_super");
 215         cifs_sb = CIFS_SB(sb);
 216         if (cifs_sb == NULL) {
 217                 cFYI(1, "Empty cifs superblock info passed to unmount");
 218                 return;
 219         }
 220
 221         rc = cifs_umount(sb, cifs_sb);
 222         if (rc)
 223                 cERROR(1, "cifs_umount failed with return code %d", rc);
 224 #ifdef CONFIG_CIFS_DFS_UPCALL
 225         if (cifs_sb->mountdata) {
 226                 kfree(cifs_sb->mountdata);
 227                 cifs_sb->mountdata = NULL;
 228         }
 229 #endif
 230
 231         unload_nls(cifs_sb->local_nls);
 232         bdi_destroy(&cifs_sb->bdi);
 233         kfree(cifs_sb);
 234 }
 235
 236 static int
 237 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
 238 {
 239         struct super_block *sb = dentry->d_sb;
 240         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 241         struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb);
 242         int rc = -EOPNOTSUPP;
 243         int xid;
 244
 245         xid = GetXid();
 246
 247         buf->f_type = CIFS_MAGIC_NUMBER;
 248
 249         /*
 250          * PATH_MAX may be too long - it would presumably be total path,
 251          * but note that some servers (includinng Samba 3) have a shorter
 252          * maximum path.
 253          *
 254          * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
 255          */
 256         buf->f_namelen = PATH_MAX;
 257         buf->f_files = 0;       /* undefined */
 258         buf->f_ffree = 0;       /* unlimited */
 259
 260         /*
 261          * We could add a second check for a QFS Unix capability bit
 262          */
 263         if ((tcon->ses->capabilities & CAP_UNIX) &&
 264             (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability)))
 265                 rc = CIFSSMBQFSPosixInfo(xid, tcon, buf);
 266
 267         /*
 268          * Only need to call the old QFSInfo if failed on newer one,
 269          * e.g. by OS/2.
 270          **/
 271         if (rc && (tcon->ses->capabilities & CAP_NT_SMBS))
 272                 rc = CIFSSMBQFSInfo(xid, tcon, buf);
 273
 274         /*
 275          * Some old Windows servers also do not support level 103, retry with
 276          * older level one if old server failed the previous call or we
 277          * bypassed it because we detected that this was an older LANMAN sess
 278          */
 279         if (rc)
 280                 rc = SMBOldQFSInfo(xid, tcon, buf);
 281
 282         FreeXid(xid);
 283         return 0;
 284 }
 285
 286 static int cifs_permission(struct inode *inode, int mask)
 287 {
 288         struct cifs_sb_info *cifs_sb;
 289
 290         cifs_sb = CIFS_SB(inode->i_sb);
 291
 292         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
 293                 if ((mask & MAY_EXEC) && !execute_ok(inode))
 294                         return -EACCES;
 295                 else
 296                         return 0;
 297         } else /* file mode might have been restricted at mount time
 298                 on the client (above and beyond ACL on servers) for
 299                 servers which do not support setting and viewing mode bits,
 300                 so allowing client to check permissions is useful */
 301                 return generic_permission(inode, mask, NULL);
 302 }
 303
 304 static struct kmem_cache *cifs_inode_cachep;
 305 static struct kmem_cache *cifs_req_cachep;
 306 static struct kmem_cache *cifs_mid_cachep;
 307 static struct kmem_cache *cifs_sm_req_cachep;
 308 mempool_t *cifs_sm_req_poolp;
 309 mempool_t *cifs_req_poolp;
 310 mempool_t *cifs_mid_poolp;
 311
 312 static struct inode *
 313 cifs_alloc_inode(struct super_block *sb)
 314 {
 315         struct cifsInodeInfo *cifs_inode;
 316         cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
 317         if (!cifs_inode)
 318                 return NULL;
 319         cifs_inode->cifsAttrs = 0x20;   /* default */
 320         cifs_inode->time = 0;
 321         /* Until the file is open and we have gotten oplock
 322         info back from the server, can not assume caching of
 323         file data or metadata */
 324         cifs_set_oplock_level(cifs_inode, 0);
 325         cifs_inode->delete_pending = false;
 326         cifs_inode->invalid_mapping = false;
 327         cifs_inode->vfs_inode.i_blkbits = 14;  /* 2**14 = CIFS_MAX_MSGSIZE */
 328         cifs_inode->server_eof = 0;
 329
 330         /* Can not set i_flags here - they get immediately overwritten
 331            to zero by the VFS */
 332 /*      cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;*/
 333         INIT_LIST_HEAD(&cifs_inode->openFileList);
 334         return &cifs_inode->vfs_inode;
 335 }
 336
 337 static void
 338 cifs_destroy_inode(struct inode *inode)
 339 {
 340         kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
 341 }
 342
 343 static void
 344 cifs_evict_inode(struct inode *inode)
 345 {
 346         truncate_inode_pages(&inode->i_data, 0);
 347         end_writeback(inode);
 348         cifs_fscache_release_inode_cookie(inode);
 349 }
 350
 351 static void
 352 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
 353 {
 354         seq_printf(s, ",addr=");
 355
 356         switch (server->addr.sockAddr.sin_family) {
 357         case AF_INET:
 358                 seq_printf(s, "%pI4", &server->addr.sockAddr.sin_addr.s_addr);
 359                 break;
 360         case AF_INET6:
 361                 seq_printf(s, "%pI6",
 362                            &server->addr.sockAddr6.sin6_addr.s6_addr);
 363                 if (server->addr.sockAddr6.sin6_scope_id)
 364                         seq_printf(s, "%%%u",
 365                                    server->addr.sockAddr6.sin6_scope_id);
 366                 break;
 367         default:
 368                 seq_printf(s, "(unknown)");
 369         }
 370 }
 371
 372 /*
 373  * cifs_show_options() is for displaying mount options in /proc/mounts.
 374  * Not all settable options are displayed but most of the important
 375  * ones are.
 376  */
 377 static int
 378 cifs_show_options(struct seq_file *s, struct vfsmount *m)
 379 {
 380         struct cifs_sb_info *cifs_sb = CIFS_SB(m->mnt_sb);
 381         struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb);
 382         struct sockaddr *srcaddr;
 383         srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
 384
 385         seq_printf(s, ",unc=%s", tcon->treeName);
 386
 387         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
 388                 seq_printf(s, ",multiuser");
 389         else if (tcon->ses->userName)
 390                 seq_printf(s, ",username=%s", tcon->ses->userName);
 391
 392         if (tcon->ses->domainName)
 393                 seq_printf(s, ",domain=%s", tcon->ses->domainName);
 394
 395         if (srcaddr->sa_family != AF_UNSPEC) {
 396                 struct sockaddr_in *saddr4;
 397                 struct sockaddr_in6 *saddr6;
 398                 saddr4 = (struct sockaddr_in *)srcaddr;
 399                 saddr6 = (struct sockaddr_in6 *)srcaddr;
 400                 if (srcaddr->sa_family == AF_INET6)
 401                         seq_printf(s, ",srcaddr=%pI6c",
 402                                    &saddr6->sin6_addr);
 403                 else if (srcaddr->sa_family == AF_INET)
 404                         seq_printf(s, ",srcaddr=%pI4",
 405                                    &saddr4->sin_addr.s_addr);
 406                 else
 407                         seq_printf(s, ",srcaddr=BAD-AF:%i",
 408                                    (int)(srcaddr->sa_family));
 409         }
 410
 411         seq_printf(s, ",uid=%d", cifs_sb->mnt_uid);
 412         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
 413                 seq_printf(s, ",forceuid");
 414         else
 415                 seq_printf(s, ",noforceuid");
 416
 417         seq_printf(s, ",gid=%d", cifs_sb->mnt_gid);
 418         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
 419                 seq_printf(s, ",forcegid");
 420         else
 421                 seq_printf(s, ",noforcegid");
 422
 423         cifs_show_address(s, tcon->ses->server);
 424
 425         if (!tcon->unix_ext)
 426                 seq_printf(s, ",file_mode=0%o,dir_mode=0%o",
 427                                            cifs_sb->mnt_file_mode,
 428                                            cifs_sb->mnt_dir_mode);
 429         if (tcon->seal)
 430                 seq_printf(s, ",seal");
 431         if (tcon->nocase)
 432                 seq_printf(s, ",nocase");
 433         if (tcon->retry)
 434                 seq_printf(s, ",hard");
 435         if (cifs_sb->prepath)
 436                 seq_printf(s, ",prepath=%s", cifs_sb->prepath);
 437         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 438                 seq_printf(s, ",posixpaths");
 439         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
 440                 seq_printf(s, ",setuids");
 441         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 442                 seq_printf(s, ",serverino");
 443         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
 444                 seq_printf(s, ",directio");
 445         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 446                 seq_printf(s, ",nouser_xattr");
 447         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 448                 seq_printf(s, ",mapchars");
 449         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
 450                 seq_printf(s, ",sfu");
 451         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 452                 seq_printf(s, ",nobrl");
 453         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
 454                 seq_printf(s, ",cifsacl");
 455         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
 456                 seq_printf(s, ",dynperm");
 457         if (m->mnt_sb->s_flags & MS_POSIXACL)
 458                 seq_printf(s, ",acl");
 459         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
 460                 seq_printf(s, ",mfsymlinks");
 461
 462         seq_printf(s, ",rsize=%d", cifs_sb->rsize);
 463         seq_printf(s, ",wsize=%d", cifs_sb->wsize);
 464
 465         return 0;
 466 }
 467
 468 static void cifs_umount_begin(struct super_block *sb)
 469 {
 470         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 471         struct cifsTconInfo *tcon;
 472
 473         if (cifs_sb == NULL)
 474                 return;
 475
 476         tcon = cifs_sb_master_tcon(cifs_sb);
 477
 478         spin_lock(&cifs_tcp_ses_lock);
 479         if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
 480                 /* we have other mounts to same share or we have
 481                    already tried to force umount this and woken up
 482                    all waiting network requests, nothing to do */
 483                 spin_unlock(&cifs_tcp_ses_lock);
 484                 return;
 485         } else if (tcon->tc_count == 1)
 486                 tcon->tidStatus = CifsExiting;
 487         spin_unlock(&cifs_tcp_ses_lock);
 488
 489         /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
 490         /* cancel_notify_requests(tcon); */
 491         if (tcon->ses && tcon->ses->server) {
 492                 cFYI(1, "wake up tasks now - umount begin not complete");
 493                 wake_up_all(&tcon->ses->server->request_q);
 494                 wake_up_all(&tcon->ses->server->response_q);
 495                 msleep(1); /* yield */
 496                 /* we have to kick the requests once more */
 497                 wake_up_all(&tcon->ses->server->response_q);
 498                 msleep(1);
 499         }
 500
 501         return;
 502 }
 503
 504 #ifdef CONFIG_CIFS_STATS2
 505 static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt)
 506 {
 507         /* BB FIXME */
 508         return 0;
 509 }
 510 #endif
 511
 512 static int cifs_remount(struct super_block *sb, int *flags, char *data)
 513 {
 514         *flags |= MS_NODIRATIME;
 515         return 0;
 516 }
 517
 518 static int cifs_drop_inode(struct inode *inode)
 519 {
 520         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 521
 522         /* no serverino => unconditional eviction */
 523         return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
 524                 generic_drop_inode(inode);
 525 }
 526
 527 static const struct super_operations cifs_super_ops = {
 528         .put_super = cifs_put_super,
 529         .statfs = cifs_statfs,
 530         .alloc_inode = cifs_alloc_inode,
 531         .destroy_inode = cifs_destroy_inode,
 532         .drop_inode     = cifs_drop_inode,
 533         .evict_inode    = cifs_evict_inode,
 534 /*      .delete_inode   = cifs_delete_inode,  */  /* Do not need above
 535         function unless later we add lazy close of inodes or unless the
 536         kernel forgets to call us with the same number of releases (closes)
 537         as opens */
 538         .show_options = cifs_show_options,
 539         .umount_begin   = cifs_umount_begin,
 540         .remount_fs = cifs_remount,
 541 #ifdef CONFIG_CIFS_STATS2
 542         .show_stats = cifs_show_stats,
 543 #endif
 544 };
 545
 546 static struct dentry *
 547 cifs_do_mount(struct file_system_type *fs_type,
 548             int flags, const char *dev_name, void *data)
 549 {
 550         int rc;
 551         struct super_block *sb;
 552
 553         sb = sget(fs_type, NULL, set_anon_super, NULL);
 554
 555         cFYI(1, "Devname: %s flags: %d ", dev_name, flags);
 556
 557         if (IS_ERR(sb))
 558                 return ERR_CAST(sb);
 559
 560         sb->s_flags = flags;
 561
 562         rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
 563         if (rc) {
 564                 deactivate_locked_super(sb);
 565                 return ERR_PTR(rc);
 566         }
 567         sb->s_flags |= MS_ACTIVE;
 568         return dget(sb->s_root);
 569 }
 570
 571 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 572                                    unsigned long nr_segs, loff_t pos)
 573 {
 574         struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
 575         ssize_t written;
 576
 577         written = generic_file_aio_write(iocb, iov, nr_segs, pos);
 578         if (!CIFS_I(inode)->clientCanCacheAll)
 579                 filemap_fdatawrite(inode->i_mapping);
 580         return written;
 581 }
 582
 583 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
 584 {
 585         /* origin == SEEK_END => we must revalidate the cached file length */
 586         if (origin == SEEK_END) {
 587                 int retval;
 588
 589                 /* some applications poll for the file length in this strange
 590                    way so we must seek to end on non-oplocked files by
 591                    setting the revalidate time to zero */
 592                 CIFS_I(file->f_path.dentry->d_inode)->time = 0;
 593
 594                 retval = cifs_revalidate_file(file);
 595                 if (retval < 0)
 596                         return (loff_t)retval;
 597         }
 598         return generic_file_llseek_unlocked(file, offset, origin);
 599 }
 600
 601 static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
 602 {
 603         /* note that this is called by vfs setlease with lock_flocks held
 604            to protect *lease from going away */
 605         struct inode *inode = file->f_path.dentry->d_inode;
 606         struct cifsFileInfo *cfile = file->private_data;
 607
 608         if (!(S_ISREG(inode->i_mode)))
 609                 return -EINVAL;
 610
 611         /* check if file is oplocked */
 612         if (((arg == F_RDLCK) &&
 613                 (CIFS_I(inode)->clientCanCacheRead)) ||
 614             ((arg == F_WRLCK) &&
 615                 (CIFS_I(inode)->clientCanCacheAll)))
 616                 return generic_setlease(file, arg, lease);
 617         else if (tlink_tcon(cfile->tlink)->local_lease &&
 618                  !CIFS_I(inode)->clientCanCacheRead)
 619                 /* If the server claims to support oplock on this
 620                    file, then we still need to check oplock even
 621                    if the local_lease mount option is set, but there
 622                    are servers which do not support oplock for which
 623                    this mount option may be useful if the user
 624                    knows that the file won't be changed on the server
 625                    by anyone else */
 626                 return generic_setlease(file, arg, lease);
 627         else
 628                 return -EAGAIN;
 629 }
 630
 631 struct file_system_type cifs_fs_type = {
 632         .owner = THIS_MODULE,
 633         .name = "cifs",
 634         .mount = cifs_do_mount,
 635         .kill_sb = kill_anon_super,
 636         /*  .fs_flags */
 637 };
 638 const struct inode_operations cifs_dir_inode_ops = {
 639         .create = cifs_create,
 640         .lookup = cifs_lookup,
 641         .getattr = cifs_getattr,
 642         .unlink = cifs_unlink,
 643         .link = cifs_hardlink,
 644         .mkdir = cifs_mkdir,
 645         .rmdir = cifs_rmdir,
 646         .rename = cifs_rename,
 647         .permission = cifs_permission,
 648 /*      revalidate:cifs_revalidate,   */
 649         .setattr = cifs_setattr,
 650         .symlink = cifs_symlink,
 651         .mknod   = cifs_mknod,
 652 #ifdef CONFIG_CIFS_XATTR
 653         .setxattr = cifs_setxattr,
 654         .getxattr = cifs_getxattr,
 655         .listxattr = cifs_listxattr,
 656         .removexattr = cifs_removexattr,
 657 #endif
 658 };
 659
 660 const struct inode_operations cifs_file_inode_ops = {
 661 /*      revalidate:cifs_revalidate, */
 662         .setattr = cifs_setattr,
 663         .getattr = cifs_getattr, /* do we need this anymore? */
 664         .rename = cifs_rename,
 665         .permission = cifs_permission,
 666 #ifdef CONFIG_CIFS_XATTR
 667         .setxattr = cifs_setxattr,
 668         .getxattr = cifs_getxattr,
 669         .listxattr = cifs_listxattr,
 670         .removexattr = cifs_removexattr,
 671 #endif
 672 };
 673
 674 const struct inode_operations cifs_symlink_inode_ops = {
 675         .readlink = generic_readlink,
 676         .follow_link = cifs_follow_link,
 677         .put_link = cifs_put_link,
 678         .permission = cifs_permission,
 679         /* BB add the following two eventually */
 680         /* revalidate: cifs_revalidate,
 681            setattr:    cifs_notify_change, *//* BB do we need notify change */
 682 #ifdef CONFIG_CIFS_XATTR
 683         .setxattr = cifs_setxattr,
 684         .getxattr = cifs_getxattr,
 685         .listxattr = cifs_listxattr,
 686         .removexattr = cifs_removexattr,
 687 #endif
 688 };
 689
 690 const struct file_operations cifs_file_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         .lock = cifs_lock,
 698         .fsync = cifs_fsync,
 699         .flush = cifs_flush,
 700         .mmap  = cifs_file_mmap,
 701         .splice_read = generic_file_splice_read,
 702         .llseek = cifs_llseek,
 703 #ifdef CONFIG_CIFS_POSIX
 704         .unlocked_ioctl = cifs_ioctl,
 705 #endif /* CONFIG_CIFS_POSIX */
 706         .setlease = cifs_setlease,
 707 };
 708
 709 const struct file_operations cifs_file_direct_ops = {
 710         /* no aio, no readv -
 711            BB reevaluate whether they can be done with directio, no cache */
 712         .read = cifs_user_read,
 713         .write = cifs_user_write,
 714         .open = cifs_open,
 715         .release = cifs_close,
 716         .lock = cifs_lock,
 717         .fsync = cifs_fsync,
 718         .flush = cifs_flush,
 719         .mmap = cifs_file_mmap,
 720         .splice_read = generic_file_splice_read,
 721 #ifdef CONFIG_CIFS_POSIX
 722         .unlocked_ioctl  = cifs_ioctl,
 723 #endif /* CONFIG_CIFS_POSIX */
 724         .llseek = cifs_llseek,
 725         .setlease = cifs_setlease,
 726 };
 727 const struct file_operations cifs_file_nobrl_ops = {
 728         .read = do_sync_read,
 729         .write = do_sync_write,
 730         .aio_read = generic_file_aio_read,
 731         .aio_write = cifs_file_aio_write,
 732         .open = cifs_open,
 733         .release = cifs_close,
 734         .fsync = cifs_fsync,
 735         .flush = cifs_flush,
 736         .mmap  = cifs_file_mmap,
 737         .splice_read = generic_file_splice_read,
 738         .llseek = cifs_llseek,
 739 #ifdef CONFIG_CIFS_POSIX
 740         .unlocked_ioctl = cifs_ioctl,
 741 #endif /* CONFIG_CIFS_POSIX */
 742         .setlease = cifs_setlease,
 743 };
 744
 745 const struct file_operations cifs_file_direct_nobrl_ops = {
 746         /* no mmap, no aio, no readv -
 747            BB reevaluate whether they can be done with directio, no cache */
 748         .read = cifs_user_read,
 749         .write = cifs_user_write,
 750         .open = cifs_open,
 751         .release = cifs_close,
 752         .fsync = cifs_fsync,
 753         .flush = cifs_flush,
 754         .mmap = cifs_file_mmap,
 755         .splice_read = generic_file_splice_read,
 756 #ifdef CONFIG_CIFS_POSIX
 757         .unlocked_ioctl  = cifs_ioctl,
 758 #endif /* CONFIG_CIFS_POSIX */
 759         .llseek = cifs_llseek,
 760         .setlease = cifs_setlease,
 761 };
 762
 763 const struct file_operations cifs_dir_ops = {
 764         .readdir = cifs_readdir,
 765         .release = cifs_closedir,
 766         .read    = generic_read_dir,
 767         .unlocked_ioctl  = cifs_ioctl,
 768         .llseek = generic_file_llseek,
 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         return 0;
 897 }
 898
 899 static void
 900 cifs_destroy_mids(void)
 901 {
 902         mempool_destroy(cifs_mid_poolp);
 903         kmem_cache_destroy(cifs_mid_cachep);
 904 }
 905
 906 static int __init
 907 init_cifs(void)
 908 {
 909         int rc = 0;
 910         cifs_proc_init();
 911         INIT_LIST_HEAD(&cifs_tcp_ses_list);
 912 #ifdef CONFIG_CIFS_EXPERIMENTAL
 913         INIT_LIST_HEAD(&GlobalDnotifyReqList);
 914         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
 915 #endif
 916 /*
 917  *  Initialize Global counters
 918  */
 919         atomic_set(&sesInfoAllocCount, 0);
 920         atomic_set(&tconInfoAllocCount, 0);
 921         atomic_set(&tcpSesAllocCount, 0);
 922         atomic_set(&tcpSesReconnectCount, 0);
 923         atomic_set(&tconInfoReconnectCount, 0);
 924
 925         atomic_set(&bufAllocCount, 0);
 926         atomic_set(&smBufAllocCount, 0);
 927 #ifdef CONFIG_CIFS_STATS2
 928         atomic_set(&totBufAllocCount, 0);
 929         atomic_set(&totSmBufAllocCount, 0);
 930 #endif /* CONFIG_CIFS_STATS2 */
 931
 932         atomic_set(&midCount, 0);
 933         GlobalCurrentXid = 0;
 934         GlobalTotalActiveXid = 0;
 935         GlobalMaxActiveXid = 0;
 936         memset(Local_System_Name, 0, 15);
 937         spin_lock_init(&cifs_tcp_ses_lock);
 938         spin_lock_init(&cifs_file_list_lock);
 939         spin_lock_init(&GlobalMid_Lock);
 940
 941         if (cifs_max_pending < 2) {
 942                 cifs_max_pending = 2;
 943                 cFYI(1, "cifs_max_pending set to min of 2");
 944         } else if (cifs_max_pending > 256) {
 945                 cifs_max_pending = 256;
 946                 cFYI(1, "cifs_max_pending set to max of 256");
 947         }
 948
 949         rc = cifs_fscache_register();
 950         if (rc)
 951                 goto out_clean_proc;
 952
 953         rc = cifs_init_inodecache();
 954         if (rc)
 955                 goto out_unreg_fscache;
 956
 957         rc = cifs_init_mids();
 958         if (rc)
 959                 goto out_destroy_inodecache;
 960
 961         rc = cifs_init_request_bufs();
 962         if (rc)
 963                 goto out_destroy_mids;
 964
 965         rc = register_filesystem(&cifs_fs_type);
 966         if (rc)
 967                 goto out_destroy_request_bufs;
 968 #ifdef CONFIG_CIFS_UPCALL
 969         rc = register_key_type(&cifs_spnego_key_type);
 970         if (rc)
 971                 goto out_unregister_filesystem;
 972 #endif
 973
 974         return 0;
 975
 976 #ifdef CONFIG_CIFS_UPCALL
 977 out_unregister_filesystem:
 978         unregister_filesystem(&cifs_fs_type);
 979 #endif
 980 out_destroy_request_bufs:
 981         cifs_destroy_request_bufs();
 982 out_destroy_mids:
 983         cifs_destroy_mids();
 984 out_destroy_inodecache:
 985         cifs_destroy_inodecache();
 986 out_unreg_fscache:
 987         cifs_fscache_unregister();
 988 out_clean_proc:
 989         cifs_proc_clean();
 990         return rc;
 991 }
 992
 993 static void __exit
 994 exit_cifs(void)
 995 {
 996         cFYI(DBG2, "exit_cifs");
 997         cifs_proc_clean();
 998         cifs_fscache_unregister();
 999 #ifdef CONFIG_CIFS_DFS_UPCALL
1000         cifs_dfs_release_automount_timer();
1001 #endif
1002 #ifdef CONFIG_CIFS_UPCALL
1003         unregister_key_type(&cifs_spnego_key_type);
1004 #endif
1005         unregister_filesystem(&cifs_fs_type);
1006         cifs_destroy_inodecache();
1007         cifs_destroy_mids();
1008         cifs_destroy_request_bufs();
1009 }
1010
1011 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1012 MODULE_LICENSE("GPL");  /* combination of LGPL + GPL source behaves as GPL */
1013 MODULE_DESCRIPTION
1014     ("VFS to access servers complying with the SNIA CIFS Specification "
1015      "e.g. Samba and Windows");
1016 MODULE_VERSION(CIFS_VERSION);
1017 module_init(init_cifs)
1018 module_exit(exit_cifs)