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 linuxExtEnabled = 1;
  57 unsigned int lookupCacheEnabled = 1;
  58 unsigned int multiuser_mount = 0;
  59 unsigned int global_secflags = CIFSSEC_DEF;
  60 /* unsigned int ntlmv2_support = 0; */
  61 unsigned int sign_CIFS_PDUs = 1;
  62 static const struct super_operations cifs_super_ops;
  63 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
  64 module_param(CIFSMaxBufSize, int, 0);
  65 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header). "
  66                                  "Default: 16384 Range: 8192 to 130048");
  67 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
  68 module_param(cifs_min_rcv, int, 0);
  69 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
  70                                 "1 to 64");
  71 unsigned int cifs_min_small = 30;
  72 module_param(cifs_min_small, int, 0);
  73 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
  74                                  "Range: 2 to 256");
  75 unsigned int cifs_max_pending = CIFS_MAX_REQ;
  76 module_param(cifs_max_pending, int, 0);
  77 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. "
  78                                    "Default: 50 Range: 2 to 256");
  79 unsigned short echo_retries = 5;
  80 module_param(echo_retries, ushort, 0644);
  81 MODULE_PARM_DESC(echo_retries, "Number of echo attempts before giving up and "
  82                                "reconnecting server. Default: 5. 0 means "
  83                                "never reconnect.");
  84 extern mempool_t *cifs_sm_req_poolp;
  85 extern mempool_t *cifs_req_poolp;
  86 extern mempool_t *cifs_mid_poolp;
  87
  88 void
  89 cifs_sb_active(struct super_block *sb)
  90 {
  91         struct cifs_sb_info *server = CIFS_SB(sb);
  92
  93         if (atomic_inc_return(&server->active) == 1)
  94                 atomic_inc(&sb->s_active);
  95 }
  96
  97 void
  98 cifs_sb_deactive(struct super_block *sb)
  99 {
 100         struct cifs_sb_info *server = CIFS_SB(sb);
 101
 102         if (atomic_dec_and_test(&server->active))
 103                 deactivate_super(sb);
 104 }
 105
 106 static int
 107 cifs_read_super(struct super_block *sb, void *data,
 108                 const char *devname, int silent)
 109 {
 110         struct inode *inode;
 111         struct cifs_sb_info *cifs_sb;
 112         int rc = 0;
 113
 114         /* BB should we make this contingent on mount parm? */
 115         sb->s_flags |= MS_NODIRATIME | MS_NOATIME;
 116         sb->s_fs_info = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
 117         cifs_sb = CIFS_SB(sb);
 118         if (cifs_sb == NULL)
 119                 return -ENOMEM;
 120
 121         spin_lock_init(&cifs_sb->tlink_tree_lock);
 122         cifs_sb->tlink_tree = RB_ROOT;
 123
 124         rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs", BDI_CAP_MAP_COPY);
 125         if (rc) {
 126                 kfree(cifs_sb);
 127                 return rc;
 128         }
 129         cifs_sb->bdi.ra_pages = default_backing_dev_info.ra_pages;
 130
 131 #ifdef CONFIG_CIFS_DFS_UPCALL
 132         /* copy mount params to sb for use in submounts */
 133         /* BB: should we move this after the mount so we
 134          * do not have to do the copy on failed mounts?
 135          * BB: May be it is better to do simple copy before
 136          * complex operation (mount), and in case of fail
 137          * just exit instead of doing mount and attempting
 138          * undo it if this copy fails?*/
 139         if (data) {
 140                 int len = strlen(data);
 141                 cifs_sb->mountdata = kzalloc(len + 1, GFP_KERNEL);
 142                 if (cifs_sb->mountdata == NULL) {
 143                         bdi_destroy(&cifs_sb->bdi);
 144                         kfree(sb->s_fs_info);
 145                         sb->s_fs_info = NULL;
 146                         return -ENOMEM;
 147                 }
 148                 strncpy(cifs_sb->mountdata, data, len + 1);
 149                 cifs_sb->mountdata[len] = '\0';
 150         }
 151 #endif
 152
 153         rc = cifs_mount(sb, cifs_sb, data, devname);
 154
 155         if (rc) {
 156                 if (!silent)
 157                         cERROR(1, "cifs_mount failed w/return code = %d", rc);
 158                 goto out_mount_failed;
 159         }
 160
 161         sb->s_magic = CIFS_MAGIC_NUMBER;
 162         sb->s_op = &cifs_super_ops;
 163         sb->s_bdi = &cifs_sb->bdi;
 164         sb->s_blocksize = CIFS_MAX_MSGSIZE;
 165         sb->s_blocksize_bits = 14;      /* default 2**14 = CIFS_MAX_MSGSIZE */
 166         inode = cifs_root_iget(sb, ROOT_I);
 167
 168         if (IS_ERR(inode)) {
 169                 rc = PTR_ERR(inode);
 170                 inode = NULL;
 171                 goto out_no_root;
 172         }
 173
 174         sb->s_root = d_alloc_root(inode);
 175
 176         if (!sb->s_root) {
 177                 rc = -ENOMEM;
 178                 goto out_no_root;
 179         }
 180
 181         /* do that *after* d_alloc_root() - we want NULL ->d_op for root here */
 182         if (cifs_sb_master_tcon(cifs_sb)->nocase)
 183                 sb->s_d_op = &cifs_ci_dentry_ops;
 184         else
 185                 sb->s_d_op = &cifs_dentry_ops;
 186
 187 #ifdef CONFIG_CIFS_EXPERIMENTAL
 188         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 189                 cFYI(1, "export ops supported");
 190                 sb->s_export_op = &cifs_export_ops;
 191         }
 192 #endif /* EXPERIMENTAL */
 193
 194         return 0;
 195
 196 out_no_root:
 197         cERROR(1, "cifs_read_super: get root inode failed");
 198         if (inode)
 199                 iput(inode);
 200
 201         cifs_umount(sb, cifs_sb);
 202
 203 out_mount_failed:
 204         if (cifs_sb) {
 205 #ifdef CONFIG_CIFS_DFS_UPCALL
 206                 if (cifs_sb->mountdata) {
 207                         kfree(cifs_sb->mountdata);
 208                         cifs_sb->mountdata = NULL;
 209                 }
 210 #endif
 211                 unload_nls(cifs_sb->local_nls);
 212                 bdi_destroy(&cifs_sb->bdi);
 213                 kfree(cifs_sb);
 214         }
 215         return rc;
 216 }
 217
 218 static void
 219 cifs_put_super(struct super_block *sb)
 220 {
 221         int rc = 0;
 222         struct cifs_sb_info *cifs_sb;
 223
 224         cFYI(1, "In cifs_put_super");
 225         cifs_sb = CIFS_SB(sb);
 226         if (cifs_sb == NULL) {
 227                 cFYI(1, "Empty cifs superblock info passed to unmount");
 228                 return;
 229         }
 230
 231         rc = cifs_umount(sb, cifs_sb);
 232         if (rc)
 233                 cERROR(1, "cifs_umount failed with return code %d", rc);
 234 #ifdef CONFIG_CIFS_DFS_UPCALL
 235         if (cifs_sb->mountdata) {
 236                 kfree(cifs_sb->mountdata);
 237                 cifs_sb->mountdata = NULL;
 238         }
 239 #endif
 240
 241         unload_nls(cifs_sb->local_nls);
 242         bdi_destroy(&cifs_sb->bdi);
 243         kfree(cifs_sb);
 244 }
 245
 246 static int
 247 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
 248 {
 249         struct super_block *sb = dentry->d_sb;
 250         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 251         struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb);
 252         int rc = -EOPNOTSUPP;
 253         int xid;
 254
 255         xid = GetXid();
 256
 257         buf->f_type = CIFS_MAGIC_NUMBER;
 258
 259         /*
 260          * PATH_MAX may be too long - it would presumably be total path,
 261          * but note that some servers (includinng Samba 3) have a shorter
 262          * maximum path.
 263          *
 264          * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
 265          */
 266         buf->f_namelen = PATH_MAX;
 267         buf->f_files = 0;       /* undefined */
 268         buf->f_ffree = 0;       /* unlimited */
 269
 270         /*
 271          * We could add a second check for a QFS Unix capability bit
 272          */
 273         if ((tcon->ses->capabilities & CAP_UNIX) &&
 274             (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability)))
 275                 rc = CIFSSMBQFSPosixInfo(xid, tcon, buf);
 276
 277         /*
 278          * Only need to call the old QFSInfo if failed on newer one,
 279          * e.g. by OS/2.
 280          **/
 281         if (rc && (tcon->ses->capabilities & CAP_NT_SMBS))
 282                 rc = CIFSSMBQFSInfo(xid, tcon, buf);
 283
 284         /*
 285          * Some old Windows servers also do not support level 103, retry with
 286          * older level one if old server failed the previous call or we
 287          * bypassed it because we detected that this was an older LANMAN sess
 288          */
 289         if (rc)
 290                 rc = SMBOldQFSInfo(xid, tcon, buf);
 291
 292         FreeXid(xid);
 293         return 0;
 294 }
 295
 296 static int cifs_permission(struct inode *inode, int mask, unsigned int flags)
 297 {
 298         struct cifs_sb_info *cifs_sb;
 299
 300         if (flags & IPERM_FLAG_RCU)
 301                 return -ECHILD;
 302
 303         cifs_sb = CIFS_SB(inode->i_sb);
 304
 305         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
 306                 if ((mask & MAY_EXEC) && !execute_ok(inode))
 307                         return -EACCES;
 308                 else
 309                         return 0;
 310         } else /* file mode might have been restricted at mount time
 311                 on the client (above and beyond ACL on servers) for
 312                 servers which do not support setting and viewing mode bits,
 313                 so allowing client to check permissions is useful */
 314                 return generic_permission(inode, mask, flags, NULL);
 315 }
 316
 317 static struct kmem_cache *cifs_inode_cachep;
 318 static struct kmem_cache *cifs_req_cachep;
 319 static struct kmem_cache *cifs_mid_cachep;
 320 static struct kmem_cache *cifs_sm_req_cachep;
 321 mempool_t *cifs_sm_req_poolp;
 322 mempool_t *cifs_req_poolp;
 323 mempool_t *cifs_mid_poolp;
 324
 325 static struct inode *
 326 cifs_alloc_inode(struct super_block *sb)
 327 {
 328         struct cifsInodeInfo *cifs_inode;
 329         cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
 330         if (!cifs_inode)
 331                 return NULL;
 332         cifs_inode->cifsAttrs = 0x20;   /* default */
 333         cifs_inode->time = 0;
 334         /* Until the file is open and we have gotten oplock
 335         info back from the server, can not assume caching of
 336         file data or metadata */
 337         cifs_set_oplock_level(cifs_inode, 0);
 338         cifs_inode->delete_pending = false;
 339         cifs_inode->invalid_mapping = false;
 340         cifs_inode->vfs_inode.i_blkbits = 14;  /* 2**14 = CIFS_MAX_MSGSIZE */
 341         cifs_inode->server_eof = 0;
 342         cifs_inode->uniqueid = 0;
 343         cifs_inode->createtime = 0;
 344
 345         /* Can not set i_flags here - they get immediately overwritten
 346            to zero by the VFS */
 347 /*      cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;*/
 348         INIT_LIST_HEAD(&cifs_inode->openFileList);
 349         return &cifs_inode->vfs_inode;
 350 }
 351
 352 static void cifs_i_callback(struct rcu_head *head)
 353 {
 354         struct inode *inode = container_of(head, struct inode, i_rcu);
 355         INIT_LIST_HEAD(&inode->i_dentry);
 356         kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
 357 }
 358
 359 static void
 360 cifs_destroy_inode(struct inode *inode)
 361 {
 362         call_rcu(&inode->i_rcu, cifs_i_callback);
 363 }
 364
 365 static void
 366 cifs_evict_inode(struct inode *inode)
 367 {
 368         truncate_inode_pages(&inode->i_data, 0);
 369         end_writeback(inode);
 370         cifs_fscache_release_inode_cookie(inode);
 371 }
 372
 373 static void
 374 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
 375 {
 376         struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
 377         struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
 378
 379         seq_printf(s, ",addr=");
 380
 381         switch (server->dstaddr.ss_family) {
 382         case AF_INET:
 383                 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
 384                 break;
 385         case AF_INET6:
 386                 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
 387                 if (sa6->sin6_scope_id)
 388                         seq_printf(s, "%%%u", sa6->sin6_scope_id);
 389                 break;
 390         default:
 391                 seq_printf(s, "(unknown)");
 392         }
 393 }
 394
 395 /*
 396  * cifs_show_options() is for displaying mount options in /proc/mounts.
 397  * Not all settable options are displayed but most of the important
 398  * ones are.
 399  */
 400 static int
 401 cifs_show_options(struct seq_file *s, struct vfsmount *m)
 402 {
 403         struct cifs_sb_info *cifs_sb = CIFS_SB(m->mnt_sb);
 404         struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb);
 405         struct sockaddr *srcaddr;
 406         srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
 407
 408         seq_printf(s, ",unc=%s", tcon->treeName);
 409
 410         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
 411                 seq_printf(s, ",multiuser");
 412         else if (tcon->ses->user_name)
 413                 seq_printf(s, ",username=%s", tcon->ses->user_name);
 414
 415         if (tcon->ses->domainName)
 416                 seq_printf(s, ",domain=%s", tcon->ses->domainName);
 417
 418         if (srcaddr->sa_family != AF_UNSPEC) {
 419                 struct sockaddr_in *saddr4;
 420                 struct sockaddr_in6 *saddr6;
 421                 saddr4 = (struct sockaddr_in *)srcaddr;
 422                 saddr6 = (struct sockaddr_in6 *)srcaddr;
 423                 if (srcaddr->sa_family == AF_INET6)
 424                         seq_printf(s, ",srcaddr=%pI6c",
 425                                    &saddr6->sin6_addr);
 426                 else if (srcaddr->sa_family == AF_INET)
 427                         seq_printf(s, ",srcaddr=%pI4",
 428                                    &saddr4->sin_addr.s_addr);
 429                 else
 430                         seq_printf(s, ",srcaddr=BAD-AF:%i",
 431                                    (int)(srcaddr->sa_family));
 432         }
 433
 434         seq_printf(s, ",uid=%d", cifs_sb->mnt_uid);
 435         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
 436                 seq_printf(s, ",forceuid");
 437         else
 438                 seq_printf(s, ",noforceuid");
 439
 440         seq_printf(s, ",gid=%d", cifs_sb->mnt_gid);
 441         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
 442                 seq_printf(s, ",forcegid");
 443         else
 444                 seq_printf(s, ",noforcegid");
 445
 446         cifs_show_address(s, tcon->ses->server);
 447
 448         if (!tcon->unix_ext)
 449                 seq_printf(s, ",file_mode=0%o,dir_mode=0%o",
 450                                            cifs_sb->mnt_file_mode,
 451                                            cifs_sb->mnt_dir_mode);
 452         if (tcon->seal)
 453                 seq_printf(s, ",seal");
 454         if (tcon->nocase)
 455                 seq_printf(s, ",nocase");
 456         if (tcon->retry)
 457                 seq_printf(s, ",hard");
 458         if (cifs_sb->prepath)
 459                 seq_printf(s, ",prepath=%s", cifs_sb->prepath);
 460         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 461                 seq_printf(s, ",posixpaths");
 462         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
 463                 seq_printf(s, ",setuids");
 464         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 465                 seq_printf(s, ",serverino");
 466         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
 467                 seq_printf(s, ",directio");
 468         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 469                 seq_printf(s, ",nouser_xattr");
 470         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 471                 seq_printf(s, ",mapchars");
 472         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
 473                 seq_printf(s, ",sfu");
 474         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 475                 seq_printf(s, ",nobrl");
 476         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
 477                 seq_printf(s, ",cifsacl");
 478         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
 479                 seq_printf(s, ",dynperm");
 480         if (m->mnt_sb->s_flags & MS_POSIXACL)
 481                 seq_printf(s, ",acl");
 482         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
 483                 seq_printf(s, ",mfsymlinks");
 484         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
 485                 seq_printf(s, ",fsc");
 486
 487         seq_printf(s, ",rsize=%d", cifs_sb->rsize);
 488         seq_printf(s, ",wsize=%d", cifs_sb->wsize);
 489         /* convert actimeo and display it in seconds */
 490                 seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
 491
 492         return 0;
 493 }
 494
 495 static void cifs_umount_begin(struct super_block *sb)
 496 {
 497         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 498         struct cifsTconInfo *tcon;
 499
 500         if (cifs_sb == NULL)
 501                 return;
 502
 503         tcon = cifs_sb_master_tcon(cifs_sb);
 504
 505         spin_lock(&cifs_tcp_ses_lock);
 506         if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
 507                 /* we have other mounts to same share or we have
 508                    already tried to force umount this and woken up
 509                    all waiting network requests, nothing to do */
 510                 spin_unlock(&cifs_tcp_ses_lock);
 511                 return;
 512         } else if (tcon->tc_count == 1)
 513                 tcon->tidStatus = CifsExiting;
 514         spin_unlock(&cifs_tcp_ses_lock);
 515
 516         /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
 517         /* cancel_notify_requests(tcon); */
 518         if (tcon->ses && tcon->ses->server) {
 519                 cFYI(1, "wake up tasks now - umount begin not complete");
 520                 wake_up_all(&tcon->ses->server->request_q);
 521                 wake_up_all(&tcon->ses->server->response_q);
 522                 msleep(1); /* yield */
 523                 /* we have to kick the requests once more */
 524                 wake_up_all(&tcon->ses->server->response_q);
 525                 msleep(1);
 526         }
 527
 528         return;
 529 }
 530
 531 #ifdef CONFIG_CIFS_STATS2
 532 static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt)
 533 {
 534         /* BB FIXME */
 535         return 0;
 536 }
 537 #endif
 538
 539 static int cifs_remount(struct super_block *sb, int *flags, char *data)
 540 {
 541         *flags |= MS_NODIRATIME;
 542         return 0;
 543 }
 544
 545 static int cifs_drop_inode(struct inode *inode)
 546 {
 547         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 548
 549         /* no serverino => unconditional eviction */
 550         return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
 551                 generic_drop_inode(inode);
 552 }
 553
 554 static const struct super_operations cifs_super_ops = {
 555         .put_super = cifs_put_super,
 556         .statfs = cifs_statfs,
 557         .alloc_inode = cifs_alloc_inode,
 558         .destroy_inode = cifs_destroy_inode,
 559         .drop_inode     = cifs_drop_inode,
 560         .evict_inode    = cifs_evict_inode,
 561 /*      .delete_inode   = cifs_delete_inode,  */  /* Do not need above
 562         function unless later we add lazy close of inodes or unless the
 563         kernel forgets to call us with the same number of releases (closes)
 564         as opens */
 565         .show_options = cifs_show_options,
 566         .umount_begin   = cifs_umount_begin,
 567         .remount_fs = cifs_remount,
 568 #ifdef CONFIG_CIFS_STATS2
 569         .show_stats = cifs_show_stats,
 570 #endif
 571 };
 572
 573 static struct dentry *
 574 cifs_do_mount(struct file_system_type *fs_type,
 575             int flags, const char *dev_name, void *data)
 576 {
 577         int rc;
 578         struct super_block *sb;
 579
 580         sb = sget(fs_type, NULL, set_anon_super, NULL);
 581
 582         cFYI(1, "Devname: %s flags: %d ", dev_name, flags);
 583
 584         if (IS_ERR(sb))
 585                 return ERR_CAST(sb);
 586
 587         sb->s_flags = flags;
 588
 589         rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
 590         if (rc) {
 591                 deactivate_locked_super(sb);
 592                 return ERR_PTR(rc);
 593         }
 594         sb->s_flags |= MS_ACTIVE;
 595         return dget(sb->s_root);
 596 }
 597
 598 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 599                                    unsigned long nr_segs, loff_t pos)
 600 {
 601         struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
 602         ssize_t written;
 603         int rc;
 604
 605         written = generic_file_aio_write(iocb, iov, nr_segs, pos);
 606
 607         if (CIFS_I(inode)->clientCanCacheAll)
 608                 return written;
 609
 610         rc = filemap_fdatawrite(inode->i_mapping);
 611         if (rc)
 612                 cFYI(1, "cifs_file_aio_write: %d rc on %p inode", rc, inode);
 613
 614         return written;
 615 }
 616
 617 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
 618 {
 619         /* origin == SEEK_END => we must revalidate the cached file length */
 620         if (origin == SEEK_END) {
 621                 int retval;
 622
 623                 /* some applications poll for the file length in this strange
 624                    way so we must seek to end on non-oplocked files by
 625                    setting the revalidate time to zero */
 626                 CIFS_I(file->f_path.dentry->d_inode)->time = 0;
 627
 628                 retval = cifs_revalidate_file(file);
 629                 if (retval < 0)
 630                         return (loff_t)retval;
 631         }
 632         return generic_file_llseek_unlocked(file, offset, origin);
 633 }
 634
 635 static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
 636 {
 637         /* note that this is called by vfs setlease with lock_flocks held
 638            to protect *lease from going away */
 639         struct inode *inode = file->f_path.dentry->d_inode;
 640         struct cifsFileInfo *cfile = file->private_data;
 641
 642         if (!(S_ISREG(inode->i_mode)))
 643                 return -EINVAL;
 644
 645         /* check if file is oplocked */
 646         if (((arg == F_RDLCK) &&
 647                 (CIFS_I(inode)->clientCanCacheRead)) ||
 648             ((arg == F_WRLCK) &&
 649                 (CIFS_I(inode)->clientCanCacheAll)))
 650                 return generic_setlease(file, arg, lease);
 651         else if (tlink_tcon(cfile->tlink)->local_lease &&
 652                  !CIFS_I(inode)->clientCanCacheRead)
 653                 /* If the server claims to support oplock on this
 654                    file, then we still need to check oplock even
 655                    if the local_lease mount option is set, but there
 656                    are servers which do not support oplock for which
 657                    this mount option may be useful if the user
 658                    knows that the file won't be changed on the server
 659                    by anyone else */
 660                 return generic_setlease(file, arg, lease);
 661         else
 662                 return -EAGAIN;
 663 }
 664
 665 struct file_system_type cifs_fs_type = {
 666         .owner = THIS_MODULE,
 667         .name = "cifs",
 668         .mount = cifs_do_mount,
 669         .kill_sb = kill_anon_super,
 670         /*  .fs_flags */
 671 };
 672 const struct inode_operations cifs_dir_inode_ops = {
 673         .create = cifs_create,
 674         .lookup = cifs_lookup,
 675         .getattr = cifs_getattr,
 676         .unlink = cifs_unlink,
 677         .link = cifs_hardlink,
 678         .mkdir = cifs_mkdir,
 679         .rmdir = cifs_rmdir,
 680         .rename = cifs_rename,
 681         .permission = cifs_permission,
 682 /*      revalidate:cifs_revalidate,   */
 683         .setattr = cifs_setattr,
 684         .symlink = cifs_symlink,
 685         .mknod   = cifs_mknod,
 686 #ifdef CONFIG_CIFS_XATTR
 687         .setxattr = cifs_setxattr,
 688         .getxattr = cifs_getxattr,
 689         .listxattr = cifs_listxattr,
 690         .removexattr = cifs_removexattr,
 691 #endif
 692 };
 693
 694 const struct inode_operations cifs_file_inode_ops = {
 695 /*      revalidate:cifs_revalidate, */
 696         .setattr = cifs_setattr,
 697         .getattr = cifs_getattr, /* do we need this anymore? */
 698         .rename = cifs_rename,
 699         .permission = cifs_permission,
 700 #ifdef CONFIG_CIFS_XATTR
 701         .setxattr = cifs_setxattr,
 702         .getxattr = cifs_getxattr,
 703         .listxattr = cifs_listxattr,
 704         .removexattr = cifs_removexattr,
 705 #endif
 706 };
 707
 708 const struct inode_operations cifs_symlink_inode_ops = {
 709         .readlink = generic_readlink,
 710         .follow_link = cifs_follow_link,
 711         .put_link = cifs_put_link,
 712         .permission = cifs_permission,
 713         /* BB add the following two eventually */
 714         /* revalidate: cifs_revalidate,
 715            setattr:    cifs_notify_change, *//* BB do we need notify change */
 716 #ifdef CONFIG_CIFS_XATTR
 717         .setxattr = cifs_setxattr,
 718         .getxattr = cifs_getxattr,
 719         .listxattr = cifs_listxattr,
 720         .removexattr = cifs_removexattr,
 721 #endif
 722 };
 723
 724 const struct file_operations cifs_file_ops = {
 725         .read = do_sync_read,
 726         .write = do_sync_write,
 727         .aio_read = generic_file_aio_read,
 728         .aio_write = cifs_file_aio_write,
 729         .open = cifs_open,
 730         .release = cifs_close,
 731         .lock = cifs_lock,
 732         .fsync = cifs_fsync,
 733         .flush = cifs_flush,
 734         .mmap  = cifs_file_mmap,
 735         .splice_read = generic_file_splice_read,
 736         .llseek = cifs_llseek,
 737 #ifdef CONFIG_CIFS_POSIX
 738         .unlocked_ioctl = cifs_ioctl,
 739 #endif /* CONFIG_CIFS_POSIX */
 740         .setlease = cifs_setlease,
 741 };
 742
 743 const struct file_operations cifs_file_strict_ops = {
 744         .read = do_sync_read,
 745         .write = do_sync_write,
 746         .aio_read = cifs_strict_readv,
 747         .aio_write = cifs_strict_writev,
 748         .open = cifs_open,
 749         .release = cifs_close,
 750         .lock = cifs_lock,
 751         .fsync = cifs_strict_fsync,
 752         .flush = cifs_flush,
 753         .mmap = cifs_file_strict_mmap,
 754         .splice_read = generic_file_splice_read,
 755         .llseek = cifs_llseek,
 756 #ifdef CONFIG_CIFS_POSIX
 757         .unlocked_ioctl = cifs_ioctl,
 758 #endif /* CONFIG_CIFS_POSIX */
 759         .setlease = cifs_setlease,
 760 };
 761
 762 const struct file_operations cifs_file_direct_ops = {
 763         /* no aio, no readv -
 764            BB reevaluate whether they can be done with directio, no cache */
 765         .read = cifs_user_read,
 766         .write = cifs_user_write,
 767         .open = cifs_open,
 768         .release = cifs_close,
 769         .lock = cifs_lock,
 770         .fsync = cifs_fsync,
 771         .flush = cifs_flush,
 772         .mmap = cifs_file_mmap,
 773         .splice_read = generic_file_splice_read,
 774 #ifdef CONFIG_CIFS_POSIX
 775         .unlocked_ioctl  = cifs_ioctl,
 776 #endif /* CONFIG_CIFS_POSIX */
 777         .llseek = cifs_llseek,
 778         .setlease = cifs_setlease,
 779 };
 780
 781 const struct file_operations cifs_file_nobrl_ops = {
 782         .read = do_sync_read,
 783         .write = do_sync_write,
 784         .aio_read = generic_file_aio_read,
 785         .aio_write = cifs_file_aio_write,
 786         .open = cifs_open,
 787         .release = cifs_close,
 788         .fsync = cifs_fsync,
 789         .flush = cifs_flush,
 790         .mmap  = cifs_file_mmap,
 791         .splice_read = generic_file_splice_read,
 792         .llseek = cifs_llseek,
 793 #ifdef CONFIG_CIFS_POSIX
 794         .unlocked_ioctl = cifs_ioctl,
 795 #endif /* CONFIG_CIFS_POSIX */
 796         .setlease = cifs_setlease,
 797 };
 798
 799 const struct file_operations cifs_file_strict_nobrl_ops = {
 800         .read = do_sync_read,
 801         .write = do_sync_write,
 802         .aio_read = cifs_strict_readv,
 803         .aio_write = cifs_strict_writev,
 804         .open = cifs_open,
 805         .release = cifs_close,
 806         .fsync = cifs_strict_fsync,
 807         .flush = cifs_flush,
 808         .mmap = cifs_file_strict_mmap,
 809         .splice_read = generic_file_splice_read,
 810         .llseek = cifs_llseek,
 811 #ifdef CONFIG_CIFS_POSIX
 812         .unlocked_ioctl = cifs_ioctl,
 813 #endif /* CONFIG_CIFS_POSIX */
 814         .setlease = cifs_setlease,
 815 };
 816
 817 const struct file_operations cifs_file_direct_nobrl_ops = {
 818         /* no mmap, no aio, no readv -
 819            BB reevaluate whether they can be done with directio, no cache */
 820         .read = cifs_user_read,
 821         .write = cifs_user_write,
 822         .open = cifs_open,
 823         .release = cifs_close,
 824         .fsync = cifs_fsync,
 825         .flush = cifs_flush,
 826         .mmap = cifs_file_mmap,
 827         .splice_read = generic_file_splice_read,
 828 #ifdef CONFIG_CIFS_POSIX
 829         .unlocked_ioctl  = cifs_ioctl,
 830 #endif /* CONFIG_CIFS_POSIX */
 831         .llseek = cifs_llseek,
 832         .setlease = cifs_setlease,
 833 };
 834
 835 const struct file_operations cifs_dir_ops = {
 836         .readdir = cifs_readdir,
 837         .release = cifs_closedir,
 838         .read    = generic_read_dir,
 839         .unlocked_ioctl  = cifs_ioctl,
 840         .llseek = generic_file_llseek,
 841 };
 842
 843 static void
 844 cifs_init_once(void *inode)
 845 {
 846         struct cifsInodeInfo *cifsi = inode;
 847
 848         inode_init_once(&cifsi->vfs_inode);
 849         INIT_LIST_HEAD(&cifsi->lockList);
 850 }
 851
 852 static int
 853 cifs_init_inodecache(void)
 854 {
 855         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
 856                                               sizeof(struct cifsInodeInfo),
 857                                               0, (SLAB_RECLAIM_ACCOUNT|
 858                                                 SLAB_MEM_SPREAD),
 859                                               cifs_init_once);
 860         if (cifs_inode_cachep == NULL)
 861                 return -ENOMEM;
 862
 863         return 0;
 864 }
 865
 866 static void
 867 cifs_destroy_inodecache(void)
 868 {
 869         kmem_cache_destroy(cifs_inode_cachep);
 870 }
 871
 872 static int
 873 cifs_init_request_bufs(void)
 874 {
 875         if (CIFSMaxBufSize < 8192) {
 876         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
 877         Unicode path name has to fit in any SMB/CIFS path based frames */
 878                 CIFSMaxBufSize = 8192;
 879         } else if (CIFSMaxBufSize > 1024*127) {
 880                 CIFSMaxBufSize = 1024 * 127;
 881         } else {
 882                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
 883         }
 884 /*      cERROR(1, "CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize); */
 885         cifs_req_cachep = kmem_cache_create("cifs_request",
 886                                             CIFSMaxBufSize +
 887                                             MAX_CIFS_HDR_SIZE, 0,
 888                                             SLAB_HWCACHE_ALIGN, NULL);
 889         if (cifs_req_cachep == NULL)
 890                 return -ENOMEM;
 891
 892         if (cifs_min_rcv < 1)
 893                 cifs_min_rcv = 1;
 894         else if (cifs_min_rcv > 64) {
 895                 cifs_min_rcv = 64;
 896                 cERROR(1, "cifs_min_rcv set to maximum (64)");
 897         }
 898
 899         cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
 900                                                   cifs_req_cachep);
 901
 902         if (cifs_req_poolp == NULL) {
 903                 kmem_cache_destroy(cifs_req_cachep);
 904                 return -ENOMEM;
 905         }
 906         /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
 907         almost all handle based requests (but not write response, nor is it
 908         sufficient for path based requests).  A smaller size would have
 909         been more efficient (compacting multiple slab items on one 4k page)
 910         for the case in which debug was on, but this larger size allows
 911         more SMBs to use small buffer alloc and is still much more
 912         efficient to alloc 1 per page off the slab compared to 17K (5page)
 913         alloc of large cifs buffers even when page debugging is on */
 914         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
 915                         MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
 916                         NULL);
 917         if (cifs_sm_req_cachep == NULL) {
 918                 mempool_destroy(cifs_req_poolp);
 919                 kmem_cache_destroy(cifs_req_cachep);
 920                 return -ENOMEM;
 921         }
 922
 923         if (cifs_min_small < 2)
 924                 cifs_min_small = 2;
 925         else if (cifs_min_small > 256) {
 926                 cifs_min_small = 256;
 927                 cFYI(1, "cifs_min_small set to maximum (256)");
 928         }
 929
 930         cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
 931                                                      cifs_sm_req_cachep);
 932
 933         if (cifs_sm_req_poolp == NULL) {
 934                 mempool_destroy(cifs_req_poolp);
 935                 kmem_cache_destroy(cifs_req_cachep);
 936                 kmem_cache_destroy(cifs_sm_req_cachep);
 937                 return -ENOMEM;
 938         }
 939
 940         return 0;
 941 }
 942
 943 static void
 944 cifs_destroy_request_bufs(void)
 945 {
 946         mempool_destroy(cifs_req_poolp);
 947         kmem_cache_destroy(cifs_req_cachep);
 948         mempool_destroy(cifs_sm_req_poolp);
 949         kmem_cache_destroy(cifs_sm_req_cachep);
 950 }
 951
 952 static int
 953 cifs_init_mids(void)
 954 {
 955         cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
 956                                             sizeof(struct mid_q_entry), 0,
 957                                             SLAB_HWCACHE_ALIGN, NULL);
 958         if (cifs_mid_cachep == NULL)
 959                 return -ENOMEM;
 960
 961         /* 3 is a reasonable minimum number of simultaneous operations */
 962         cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
 963         if (cifs_mid_poolp == NULL) {
 964                 kmem_cache_destroy(cifs_mid_cachep);
 965                 return -ENOMEM;
 966         }
 967
 968         return 0;
 969 }
 970
 971 static void
 972 cifs_destroy_mids(void)
 973 {
 974         mempool_destroy(cifs_mid_poolp);
 975         kmem_cache_destroy(cifs_mid_cachep);
 976 }
 977
 978 static int __init
 979 init_cifs(void)
 980 {
 981         int rc = 0;
 982         cifs_proc_init();
 983         INIT_LIST_HEAD(&cifs_tcp_ses_list);
 984 #ifdef CONFIG_CIFS_EXPERIMENTAL
 985         INIT_LIST_HEAD(&GlobalDnotifyReqList);
 986         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
 987 #endif
 988 /*
 989  *  Initialize Global counters
 990  */
 991         atomic_set(&sesInfoAllocCount, 0);
 992         atomic_set(&tconInfoAllocCount, 0);
 993         atomic_set(&tcpSesAllocCount, 0);
 994         atomic_set(&tcpSesReconnectCount, 0);
 995         atomic_set(&tconInfoReconnectCount, 0);
 996
 997         atomic_set(&bufAllocCount, 0);
 998         atomic_set(&smBufAllocCount, 0);
 999 #ifdef CONFIG_CIFS_STATS2
1000         atomic_set(&totBufAllocCount, 0);
1001         atomic_set(&totSmBufAllocCount, 0);
1002 #endif /* CONFIG_CIFS_STATS2 */
1003
1004         atomic_set(&midCount, 0);
1005         GlobalCurrentXid = 0;
1006         GlobalTotalActiveXid = 0;
1007         GlobalMaxActiveXid = 0;
1008         spin_lock_init(&cifs_tcp_ses_lock);
1009         spin_lock_init(&cifs_file_list_lock);
1010         spin_lock_init(&GlobalMid_Lock);
1011
1012         if (cifs_max_pending < 2) {
1013                 cifs_max_pending = 2;
1014                 cFYI(1, "cifs_max_pending set to min of 2");
1015         } else if (cifs_max_pending > 256) {
1016                 cifs_max_pending = 256;
1017                 cFYI(1, "cifs_max_pending set to max of 256");
1018         }
1019
1020         rc = cifs_fscache_register();
1021         if (rc)
1022                 goto out_clean_proc;
1023
1024         rc = cifs_init_inodecache();
1025         if (rc)
1026                 goto out_unreg_fscache;
1027
1028         rc = cifs_init_mids();
1029         if (rc)
1030                 goto out_destroy_inodecache;
1031
1032         rc = cifs_init_request_bufs();
1033         if (rc)
1034                 goto out_destroy_mids;
1035
1036         rc = register_filesystem(&cifs_fs_type);
1037         if (rc)
1038                 goto out_destroy_request_bufs;
1039 #ifdef CONFIG_CIFS_UPCALL
1040         rc = register_key_type(&cifs_spnego_key_type);
1041         if (rc)
1042                 goto out_unregister_filesystem;
1043 #endif
1044
1045         return 0;
1046
1047 #ifdef CONFIG_CIFS_UPCALL
1048 out_unregister_filesystem:
1049         unregister_filesystem(&cifs_fs_type);
1050 #endif
1051 out_destroy_request_bufs:
1052         cifs_destroy_request_bufs();
1053 out_destroy_mids:
1054         cifs_destroy_mids();
1055 out_destroy_inodecache:
1056         cifs_destroy_inodecache();
1057 out_unreg_fscache:
1058         cifs_fscache_unregister();
1059 out_clean_proc:
1060         cifs_proc_clean();
1061         return rc;
1062 }
1063
1064 static void __exit
1065 exit_cifs(void)
1066 {
1067         cFYI(DBG2, "exit_cifs");
1068         cifs_proc_clean();
1069         cifs_fscache_unregister();
1070 #ifdef CONFIG_CIFS_DFS_UPCALL
1071         cifs_dfs_release_automount_timer();
1072 #endif
1073 #ifdef CONFIG_CIFS_UPCALL
1074         unregister_key_type(&cifs_spnego_key_type);
1075 #endif
1076         unregister_filesystem(&cifs_fs_type);
1077         cifs_destroy_inodecache();
1078         cifs_destroy_mids();
1079         cifs_destroy_request_bufs();
1080 }
1081
1082 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1083 MODULE_LICENSE("GPL");  /* combination of LGPL + GPL source behaves as GPL */
1084 MODULE_DESCRIPTION
1085     ("VFS to access servers complying with the SNIA CIFS Specification "
1086      "e.g. Samba and Windows");
1087 MODULE_VERSION(CIFS_VERSION);
1088 module_init(init_cifs)
1089 module_exit(exit_cifs)