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         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
 462                 seq_printf(s, ",fsc");
 463
 464         seq_printf(s, ",rsize=%d", cifs_sb->rsize);
 465         seq_printf(s, ",wsize=%d", cifs_sb->wsize);
 466
 467         return 0;
 468 }
 469
 470 static void cifs_umount_begin(struct super_block *sb)
 471 {
 472         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 473         struct cifsTconInfo *tcon;
 474
 475         if (cifs_sb == NULL)
 476                 return;
 477
 478         tcon = cifs_sb_master_tcon(cifs_sb);
 479
 480         spin_lock(&cifs_tcp_ses_lock);
 481         if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
 482                 /* we have other mounts to same share or we have
 483                    already tried to force umount this and woken up
 484                    all waiting network requests, nothing to do */
 485                 spin_unlock(&cifs_tcp_ses_lock);
 486                 return;
 487         } else if (tcon->tc_count == 1)
 488                 tcon->tidStatus = CifsExiting;
 489         spin_unlock(&cifs_tcp_ses_lock);
 490
 491         /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
 492         /* cancel_notify_requests(tcon); */
 493         if (tcon->ses && tcon->ses->server) {
 494                 cFYI(1, "wake up tasks now - umount begin not complete");
 495                 wake_up_all(&tcon->ses->server->request_q);
 496                 wake_up_all(&tcon->ses->server->response_q);
 497                 msleep(1); /* yield */
 498                 /* we have to kick the requests once more */
 499                 wake_up_all(&tcon->ses->server->response_q);
 500                 msleep(1);
 501         }
 502
 503         return;
 504 }
 505
 506 #ifdef CONFIG_CIFS_STATS2
 507 static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt)
 508 {
 509         /* BB FIXME */
 510         return 0;
 511 }
 512 #endif
 513
 514 static int cifs_remount(struct super_block *sb, int *flags, char *data)
 515 {
 516         *flags |= MS_NODIRATIME;
 517         return 0;
 518 }
 519
 520 static int cifs_drop_inode(struct inode *inode)
 521 {
 522         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 523
 524         /* no serverino => unconditional eviction */
 525         return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
 526                 generic_drop_inode(inode);
 527 }
 528
 529 static const struct super_operations cifs_super_ops = {
 530         .put_super = cifs_put_super,
 531         .statfs = cifs_statfs,
 532         .alloc_inode = cifs_alloc_inode,
 533         .destroy_inode = cifs_destroy_inode,
 534         .drop_inode     = cifs_drop_inode,
 535         .evict_inode    = cifs_evict_inode,
 536 /*      .delete_inode   = cifs_delete_inode,  */  /* Do not need above
 537         function unless later we add lazy close of inodes or unless the
 538         kernel forgets to call us with the same number of releases (closes)
 539         as opens */
 540         .show_options = cifs_show_options,
 541         .umount_begin   = cifs_umount_begin,
 542         .remount_fs = cifs_remount,
 543 #ifdef CONFIG_CIFS_STATS2
 544         .show_stats = cifs_show_stats,
 545 #endif
 546 };
 547
 548 static struct dentry *
 549 cifs_do_mount(struct file_system_type *fs_type,
 550             int flags, const char *dev_name, void *data)
 551 {
 552         int rc;
 553         struct super_block *sb;
 554
 555         sb = sget(fs_type, NULL, set_anon_super, NULL);
 556
 557         cFYI(1, "Devname: %s flags: %d ", dev_name, flags);
 558
 559         if (IS_ERR(sb))
 560                 return ERR_CAST(sb);
 561
 562         sb->s_flags = flags;
 563
 564         rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
 565         if (rc) {
 566                 deactivate_locked_super(sb);
 567                 return ERR_PTR(rc);
 568         }
 569         sb->s_flags |= MS_ACTIVE;
 570         return dget(sb->s_root);
 571 }
 572
 573 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 574                                    unsigned long nr_segs, loff_t pos)
 575 {
 576         struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
 577         ssize_t written;
 578
 579         written = generic_file_aio_write(iocb, iov, nr_segs, pos);
 580         if (!CIFS_I(inode)->clientCanCacheAll)
 581                 filemap_fdatawrite(inode->i_mapping);
 582         return written;
 583 }
 584
 585 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
 586 {
 587         /* origin == SEEK_END => we must revalidate the cached file length */
 588         if (origin == SEEK_END) {
 589                 int retval;
 590
 591                 /* some applications poll for the file length in this strange
 592                    way so we must seek to end on non-oplocked files by
 593                    setting the revalidate time to zero */
 594                 CIFS_I(file->f_path.dentry->d_inode)->time = 0;
 595
 596                 retval = cifs_revalidate_file(file);
 597                 if (retval < 0)
 598                         return (loff_t)retval;
 599         }
 600         return generic_file_llseek_unlocked(file, offset, origin);
 601 }
 602
 603 static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
 604 {
 605         /* note that this is called by vfs setlease with lock_flocks held
 606            to protect *lease from going away */
 607         struct inode *inode = file->f_path.dentry->d_inode;
 608         struct cifsFileInfo *cfile = file->private_data;
 609
 610         if (!(S_ISREG(inode->i_mode)))
 611                 return -EINVAL;
 612
 613         /* check if file is oplocked */
 614         if (((arg == F_RDLCK) &&
 615                 (CIFS_I(inode)->clientCanCacheRead)) ||
 616             ((arg == F_WRLCK) &&
 617                 (CIFS_I(inode)->clientCanCacheAll)))
 618                 return generic_setlease(file, arg, lease);
 619         else if (tlink_tcon(cfile->tlink)->local_lease &&
 620                  !CIFS_I(inode)->clientCanCacheRead)
 621                 /* If the server claims to support oplock on this
 622                    file, then we still need to check oplock even
 623                    if the local_lease mount option is set, but there
 624                    are servers which do not support oplock for which
 625                    this mount option may be useful if the user
 626                    knows that the file won't be changed on the server
 627                    by anyone else */
 628                 return generic_setlease(file, arg, lease);
 629         else
 630                 return -EAGAIN;
 631 }
 632
 633 struct file_system_type cifs_fs_type = {
 634         .owner = THIS_MODULE,
 635         .name = "cifs",
 636         .mount = cifs_do_mount,
 637         .kill_sb = kill_anon_super,
 638         /*  .fs_flags */
 639 };
 640 const struct inode_operations cifs_dir_inode_ops = {
 641         .create = cifs_create,
 642         .lookup = cifs_lookup,
 643         .getattr = cifs_getattr,
 644         .unlink = cifs_unlink,
 645         .link = cifs_hardlink,
 646         .mkdir = cifs_mkdir,
 647         .rmdir = cifs_rmdir,
 648         .rename = cifs_rename,
 649         .permission = cifs_permission,
 650 /*      revalidate:cifs_revalidate,   */
 651         .setattr = cifs_setattr,
 652         .symlink = cifs_symlink,
 653         .mknod   = cifs_mknod,
 654 #ifdef CONFIG_CIFS_XATTR
 655         .setxattr = cifs_setxattr,
 656         .getxattr = cifs_getxattr,
 657         .listxattr = cifs_listxattr,
 658         .removexattr = cifs_removexattr,
 659 #endif
 660 };
 661
 662 const struct inode_operations cifs_file_inode_ops = {
 663 /*      revalidate:cifs_revalidate, */
 664         .setattr = cifs_setattr,
 665         .getattr = cifs_getattr, /* do we need this anymore? */
 666         .rename = cifs_rename,
 667         .permission = cifs_permission,
 668 #ifdef CONFIG_CIFS_XATTR
 669         .setxattr = cifs_setxattr,
 670         .getxattr = cifs_getxattr,
 671         .listxattr = cifs_listxattr,
 672         .removexattr = cifs_removexattr,
 673 #endif
 674 };
 675
 676 const struct inode_operations cifs_symlink_inode_ops = {
 677         .readlink = generic_readlink,
 678         .follow_link = cifs_follow_link,
 679         .put_link = cifs_put_link,
 680         .permission = cifs_permission,
 681         /* BB add the following two eventually */
 682         /* revalidate: cifs_revalidate,
 683            setattr:    cifs_notify_change, *//* BB do we need notify change */
 684 #ifdef CONFIG_CIFS_XATTR
 685         .setxattr = cifs_setxattr,
 686         .getxattr = cifs_getxattr,
 687         .listxattr = cifs_listxattr,
 688         .removexattr = cifs_removexattr,
 689 #endif
 690 };
 691
 692 const struct file_operations cifs_file_ops = {
 693         .read = do_sync_read,
 694         .write = do_sync_write,
 695         .aio_read = generic_file_aio_read,
 696         .aio_write = cifs_file_aio_write,
 697         .open = cifs_open,
 698         .release = cifs_close,
 699         .lock = cifs_lock,
 700         .fsync = cifs_fsync,
 701         .flush = cifs_flush,
 702         .mmap  = cifs_file_mmap,
 703         .splice_read = generic_file_splice_read,
 704         .llseek = cifs_llseek,
 705 #ifdef CONFIG_CIFS_POSIX
 706         .unlocked_ioctl = cifs_ioctl,
 707 #endif /* CONFIG_CIFS_POSIX */
 708         .setlease = cifs_setlease,
 709 };
 710
 711 const struct file_operations cifs_file_direct_ops = {
 712         /* no aio, no readv -
 713            BB reevaluate whether they can be done with directio, no cache */
 714         .read = cifs_user_read,
 715         .write = cifs_user_write,
 716         .open = cifs_open,
 717         .release = cifs_close,
 718         .lock = cifs_lock,
 719         .fsync = cifs_fsync,
 720         .flush = cifs_flush,
 721         .mmap = cifs_file_mmap,
 722         .splice_read = generic_file_splice_read,
 723 #ifdef CONFIG_CIFS_POSIX
 724         .unlocked_ioctl  = cifs_ioctl,
 725 #endif /* CONFIG_CIFS_POSIX */
 726         .llseek = cifs_llseek,
 727         .setlease = cifs_setlease,
 728 };
 729 const struct file_operations cifs_file_nobrl_ops = {
 730         .read = do_sync_read,
 731         .write = do_sync_write,
 732         .aio_read = generic_file_aio_read,
 733         .aio_write = cifs_file_aio_write,
 734         .open = cifs_open,
 735         .release = cifs_close,
 736         .fsync = cifs_fsync,
 737         .flush = cifs_flush,
 738         .mmap  = cifs_file_mmap,
 739         .splice_read = generic_file_splice_read,
 740         .llseek = cifs_llseek,
 741 #ifdef CONFIG_CIFS_POSIX
 742         .unlocked_ioctl = cifs_ioctl,
 743 #endif /* CONFIG_CIFS_POSIX */
 744         .setlease = cifs_setlease,
 745 };
 746
 747 const struct file_operations cifs_file_direct_nobrl_ops = {
 748         /* no mmap, no aio, no readv -
 749            BB reevaluate whether they can be done with directio, no cache */
 750         .read = cifs_user_read,
 751         .write = cifs_user_write,
 752         .open = cifs_open,
 753         .release = cifs_close,
 754         .fsync = cifs_fsync,
 755         .flush = cifs_flush,
 756         .mmap = cifs_file_mmap,
 757         .splice_read = generic_file_splice_read,
 758 #ifdef CONFIG_CIFS_POSIX
 759         .unlocked_ioctl  = cifs_ioctl,
 760 #endif /* CONFIG_CIFS_POSIX */
 761         .llseek = cifs_llseek,
 762         .setlease = cifs_setlease,
 763 };
 764
 765 const struct file_operations cifs_dir_ops = {
 766         .readdir = cifs_readdir,
 767         .release = cifs_closedir,
 768         .read    = generic_read_dir,
 769         .unlocked_ioctl  = cifs_ioctl,
 770         .llseek = generic_file_llseek,
 771 };
 772
 773 static void
 774 cifs_init_once(void *inode)
 775 {
 776         struct cifsInodeInfo *cifsi = inode;
 777
 778         inode_init_once(&cifsi->vfs_inode);
 779         INIT_LIST_HEAD(&cifsi->lockList);
 780 }
 781
 782 static int
 783 cifs_init_inodecache(void)
 784 {
 785         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
 786                                               sizeof(struct cifsInodeInfo),
 787                                               0, (SLAB_RECLAIM_ACCOUNT|
 788                                                 SLAB_MEM_SPREAD),
 789                                               cifs_init_once);
 790         if (cifs_inode_cachep == NULL)
 791                 return -ENOMEM;
 792
 793         return 0;
 794 }
 795
 796 static void
 797 cifs_destroy_inodecache(void)
 798 {
 799         kmem_cache_destroy(cifs_inode_cachep);
 800 }
 801
 802 static int
 803 cifs_init_request_bufs(void)
 804 {
 805         if (CIFSMaxBufSize < 8192) {
 806         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
 807         Unicode path name has to fit in any SMB/CIFS path based frames */
 808                 CIFSMaxBufSize = 8192;
 809         } else if (CIFSMaxBufSize > 1024*127) {
 810                 CIFSMaxBufSize = 1024 * 127;
 811         } else {
 812                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
 813         }
 814 /*      cERROR(1, "CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize); */
 815         cifs_req_cachep = kmem_cache_create("cifs_request",
 816                                             CIFSMaxBufSize +
 817                                             MAX_CIFS_HDR_SIZE, 0,
 818                                             SLAB_HWCACHE_ALIGN, NULL);
 819         if (cifs_req_cachep == NULL)
 820                 return -ENOMEM;
 821
 822         if (cifs_min_rcv < 1)
 823                 cifs_min_rcv = 1;
 824         else if (cifs_min_rcv > 64) {
 825                 cifs_min_rcv = 64;
 826                 cERROR(1, "cifs_min_rcv set to maximum (64)");
 827         }
 828
 829         cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
 830                                                   cifs_req_cachep);
 831
 832         if (cifs_req_poolp == NULL) {
 833                 kmem_cache_destroy(cifs_req_cachep);
 834                 return -ENOMEM;
 835         }
 836         /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
 837         almost all handle based requests (but not write response, nor is it
 838         sufficient for path based requests).  A smaller size would have
 839         been more efficient (compacting multiple slab items on one 4k page)
 840         for the case in which debug was on, but this larger size allows
 841         more SMBs to use small buffer alloc and is still much more
 842         efficient to alloc 1 per page off the slab compared to 17K (5page)
 843         alloc of large cifs buffers even when page debugging is on */
 844         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
 845                         MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
 846                         NULL);
 847         if (cifs_sm_req_cachep == NULL) {
 848                 mempool_destroy(cifs_req_poolp);
 849                 kmem_cache_destroy(cifs_req_cachep);
 850                 return -ENOMEM;
 851         }
 852
 853         if (cifs_min_small < 2)
 854                 cifs_min_small = 2;
 855         else if (cifs_min_small > 256) {
 856                 cifs_min_small = 256;
 857                 cFYI(1, "cifs_min_small set to maximum (256)");
 858         }
 859
 860         cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
 861                                                      cifs_sm_req_cachep);
 862
 863         if (cifs_sm_req_poolp == NULL) {
 864                 mempool_destroy(cifs_req_poolp);
 865                 kmem_cache_destroy(cifs_req_cachep);
 866                 kmem_cache_destroy(cifs_sm_req_cachep);
 867                 return -ENOMEM;
 868         }
 869
 870         return 0;
 871 }
 872
 873 static void
 874 cifs_destroy_request_bufs(void)
 875 {
 876         mempool_destroy(cifs_req_poolp);
 877         kmem_cache_destroy(cifs_req_cachep);
 878         mempool_destroy(cifs_sm_req_poolp);
 879         kmem_cache_destroy(cifs_sm_req_cachep);
 880 }
 881
 882 static int
 883 cifs_init_mids(void)
 884 {
 885         cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
 886                                             sizeof(struct mid_q_entry), 0,
 887                                             SLAB_HWCACHE_ALIGN, NULL);
 888         if (cifs_mid_cachep == NULL)
 889                 return -ENOMEM;
 890
 891         /* 3 is a reasonable minimum number of simultaneous operations */
 892         cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
 893         if (cifs_mid_poolp == NULL) {
 894                 kmem_cache_destroy(cifs_mid_cachep);
 895                 return -ENOMEM;
 896         }
 897
 898         return 0;
 899 }
 900
 901 static void
 902 cifs_destroy_mids(void)
 903 {
 904         mempool_destroy(cifs_mid_poolp);
 905         kmem_cache_destroy(cifs_mid_cachep);
 906 }
 907
 908 static int __init
 909 init_cifs(void)
 910 {
 911         int rc = 0;
 912         cifs_proc_init();
 913         INIT_LIST_HEAD(&cifs_tcp_ses_list);
 914 #ifdef CONFIG_CIFS_EXPERIMENTAL
 915         INIT_LIST_HEAD(&GlobalDnotifyReqList);
 916         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
 917 #endif
 918 /*
 919  *  Initialize Global counters
 920  */
 921         atomic_set(&sesInfoAllocCount, 0);
 922         atomic_set(&tconInfoAllocCount, 0);
 923         atomic_set(&tcpSesAllocCount, 0);
 924         atomic_set(&tcpSesReconnectCount, 0);
 925         atomic_set(&tconInfoReconnectCount, 0);
 926
 927         atomic_set(&bufAllocCount, 0);
 928         atomic_set(&smBufAllocCount, 0);
 929 #ifdef CONFIG_CIFS_STATS2
 930         atomic_set(&totBufAllocCount, 0);
 931         atomic_set(&totSmBufAllocCount, 0);
 932 #endif /* CONFIG_CIFS_STATS2 */
 933
 934         atomic_set(&midCount, 0);
 935         GlobalCurrentXid = 0;
 936         GlobalTotalActiveXid = 0;
 937         GlobalMaxActiveXid = 0;
 938         memset(Local_System_Name, 0, 15);
 939         spin_lock_init(&cifs_tcp_ses_lock);
 940         spin_lock_init(&cifs_file_list_lock);
 941         spin_lock_init(&GlobalMid_Lock);
 942
 943         if (cifs_max_pending < 2) {
 944                 cifs_max_pending = 2;
 945                 cFYI(1, "cifs_max_pending set to min of 2");
 946         } else if (cifs_max_pending > 256) {
 947                 cifs_max_pending = 256;
 948                 cFYI(1, "cifs_max_pending set to max of 256");
 949         }
 950
 951         rc = cifs_fscache_register();
 952         if (rc)
 953                 goto out_clean_proc;
 954
 955         rc = cifs_init_inodecache();
 956         if (rc)
 957                 goto out_unreg_fscache;
 958
 959         rc = cifs_init_mids();
 960         if (rc)
 961                 goto out_destroy_inodecache;
 962
 963         rc = cifs_init_request_bufs();
 964         if (rc)
 965                 goto out_destroy_mids;
 966
 967         rc = register_filesystem(&cifs_fs_type);
 968         if (rc)
 969                 goto out_destroy_request_bufs;
 970 #ifdef CONFIG_CIFS_UPCALL
 971         rc = register_key_type(&cifs_spnego_key_type);
 972         if (rc)
 973                 goto out_unregister_filesystem;
 974 #endif
 975
 976         return 0;
 977
 978 #ifdef CONFIG_CIFS_UPCALL
 979 out_unregister_filesystem:
 980         unregister_filesystem(&cifs_fs_type);
 981 #endif
 982 out_destroy_request_bufs:
 983         cifs_destroy_request_bufs();
 984 out_destroy_mids:
 985         cifs_destroy_mids();
 986 out_destroy_inodecache:
 987         cifs_destroy_inodecache();
 988 out_unreg_fscache:
 989         cifs_fscache_unregister();
 990 out_clean_proc:
 991         cifs_proc_clean();
 992         return rc;
 993 }
 994
 995 static void __exit
 996 exit_cifs(void)
 997 {
 998         cFYI(DBG2, "exit_cifs");
 999         cifs_proc_clean();
1000         cifs_fscache_unregister();
1001 #ifdef CONFIG_CIFS_DFS_UPCALL
1002         cifs_dfs_release_automount_timer();
1003 #endif
1004 #ifdef CONFIG_CIFS_UPCALL
1005         unregister_key_type(&cifs_spnego_key_type);
1006 #endif
1007         unregister_filesystem(&cifs_fs_type);
1008         cifs_destroy_inodecache();
1009         cifs_destroy_mids();
1010         cifs_destroy_request_bufs();
1011 }
1012
1013 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1014 MODULE_LICENSE("GPL");  /* combination of LGPL + GPL source behaves as GPL */
1015 MODULE_DESCRIPTION
1016     ("VFS to access servers complying with the SNIA CIFS Specification "
1017      "e.g. Samba and Windows");
1018 MODULE_VERSION(CIFS_VERSION);
1019 module_init(init_cifs)
1020 module_exit(exit_cifs)