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         /* convert actimeo and display it in seconds */
 467                 seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
 468
 469         return 0;
 470 }
 471
 472 static void cifs_umount_begin(struct super_block *sb)
 473 {
 474         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 475         struct cifsTconInfo *tcon;
 476
 477         if (cifs_sb == NULL)
 478                 return;
 479
 480         tcon = cifs_sb_master_tcon(cifs_sb);
 481
 482         spin_lock(&cifs_tcp_ses_lock);
 483         if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
 484                 /* we have other mounts to same share or we have
 485                    already tried to force umount this and woken up
 486                    all waiting network requests, nothing to do */
 487                 spin_unlock(&cifs_tcp_ses_lock);
 488                 return;
 489         } else if (tcon->tc_count == 1)
 490                 tcon->tidStatus = CifsExiting;
 491         spin_unlock(&cifs_tcp_ses_lock);
 492
 493         /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
 494         /* cancel_notify_requests(tcon); */
 495         if (tcon->ses && tcon->ses->server) {
 496                 cFYI(1, "wake up tasks now - umount begin not complete");
 497                 wake_up_all(&tcon->ses->server->request_q);
 498                 wake_up_all(&tcon->ses->server->response_q);
 499                 msleep(1); /* yield */
 500                 /* we have to kick the requests once more */
 501                 wake_up_all(&tcon->ses->server->response_q);
 502                 msleep(1);
 503         }
 504
 505         return;
 506 }
 507
 508 #ifdef CONFIG_CIFS_STATS2
 509 static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt)
 510 {
 511         /* BB FIXME */
 512         return 0;
 513 }
 514 #endif
 515
 516 static int cifs_remount(struct super_block *sb, int *flags, char *data)
 517 {
 518         *flags |= MS_NODIRATIME;
 519         return 0;
 520 }
 521
 522 static int cifs_drop_inode(struct inode *inode)
 523 {
 524         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 525
 526         /* no serverino => unconditional eviction */
 527         return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
 528                 generic_drop_inode(inode);
 529 }
 530
 531 static const struct super_operations cifs_super_ops = {
 532         .put_super = cifs_put_super,
 533         .statfs = cifs_statfs,
 534         .alloc_inode = cifs_alloc_inode,
 535         .destroy_inode = cifs_destroy_inode,
 536         .drop_inode     = cifs_drop_inode,
 537         .evict_inode    = cifs_evict_inode,
 538 /*      .delete_inode   = cifs_delete_inode,  */  /* Do not need above
 539         function unless later we add lazy close of inodes or unless the
 540         kernel forgets to call us with the same number of releases (closes)
 541         as opens */
 542         .show_options = cifs_show_options,
 543         .umount_begin   = cifs_umount_begin,
 544         .remount_fs = cifs_remount,
 545 #ifdef CONFIG_CIFS_STATS2
 546         .show_stats = cifs_show_stats,
 547 #endif
 548 };
 549
 550 static struct dentry *
 551 cifs_do_mount(struct file_system_type *fs_type,
 552             int flags, const char *dev_name, void *data)
 553 {
 554         int rc;
 555         struct super_block *sb;
 556
 557         sb = sget(fs_type, NULL, set_anon_super, NULL);
 558
 559         cFYI(1, "Devname: %s flags: %d ", dev_name, flags);
 560
 561         if (IS_ERR(sb))
 562                 return ERR_CAST(sb);
 563
 564         sb->s_flags = flags;
 565
 566         rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
 567         if (rc) {
 568                 deactivate_locked_super(sb);
 569                 return ERR_PTR(rc);
 570         }
 571         sb->s_flags |= MS_ACTIVE;
 572         return dget(sb->s_root);
 573 }
 574
 575 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 576                                    unsigned long nr_segs, loff_t pos)
 577 {
 578         struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
 579         ssize_t written;
 580
 581         written = generic_file_aio_write(iocb, iov, nr_segs, pos);
 582         if (!CIFS_I(inode)->clientCanCacheAll)
 583                 filemap_fdatawrite(inode->i_mapping);
 584         return written;
 585 }
 586
 587 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
 588 {
 589         /* origin == SEEK_END => we must revalidate the cached file length */
 590         if (origin == SEEK_END) {
 591                 int retval;
 592
 593                 /* some applications poll for the file length in this strange
 594                    way so we must seek to end on non-oplocked files by
 595                    setting the revalidate time to zero */
 596                 CIFS_I(file->f_path.dentry->d_inode)->time = 0;
 597
 598                 retval = cifs_revalidate_file(file);
 599                 if (retval < 0)
 600                         return (loff_t)retval;
 601         }
 602         return generic_file_llseek_unlocked(file, offset, origin);
 603 }
 604
 605 static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
 606 {
 607         /* note that this is called by vfs setlease with lock_flocks held
 608            to protect *lease from going away */
 609         struct inode *inode = file->f_path.dentry->d_inode;
 610         struct cifsFileInfo *cfile = file->private_data;
 611
 612         if (!(S_ISREG(inode->i_mode)))
 613                 return -EINVAL;
 614
 615         /* check if file is oplocked */
 616         if (((arg == F_RDLCK) &&
 617                 (CIFS_I(inode)->clientCanCacheRead)) ||
 618             ((arg == F_WRLCK) &&
 619                 (CIFS_I(inode)->clientCanCacheAll)))
 620                 return generic_setlease(file, arg, lease);
 621         else if (tlink_tcon(cfile->tlink)->local_lease &&
 622                  !CIFS_I(inode)->clientCanCacheRead)
 623                 /* If the server claims to support oplock on this
 624                    file, then we still need to check oplock even
 625                    if the local_lease mount option is set, but there
 626                    are servers which do not support oplock for which
 627                    this mount option may be useful if the user
 628                    knows that the file won't be changed on the server
 629                    by anyone else */
 630                 return generic_setlease(file, arg, lease);
 631         else
 632                 return -EAGAIN;
 633 }
 634
 635 struct file_system_type cifs_fs_type = {
 636         .owner = THIS_MODULE,
 637         .name = "cifs",
 638         .mount = cifs_do_mount,
 639         .kill_sb = kill_anon_super,
 640         /*  .fs_flags */
 641 };
 642 const struct inode_operations cifs_dir_inode_ops = {
 643         .create = cifs_create,
 644         .lookup = cifs_lookup,
 645         .getattr = cifs_getattr,
 646         .unlink = cifs_unlink,
 647         .link = cifs_hardlink,
 648         .mkdir = cifs_mkdir,
 649         .rmdir = cifs_rmdir,
 650         .rename = cifs_rename,
 651         .permission = cifs_permission,
 652 /*      revalidate:cifs_revalidate,   */
 653         .setattr = cifs_setattr,
 654         .symlink = cifs_symlink,
 655         .mknod   = cifs_mknod,
 656 #ifdef CONFIG_CIFS_XATTR
 657         .setxattr = cifs_setxattr,
 658         .getxattr = cifs_getxattr,
 659         .listxattr = cifs_listxattr,
 660         .removexattr = cifs_removexattr,
 661 #endif
 662 };
 663
 664 const struct inode_operations cifs_file_inode_ops = {
 665 /*      revalidate:cifs_revalidate, */
 666         .setattr = cifs_setattr,
 667         .getattr = cifs_getattr, /* do we need this anymore? */
 668         .rename = cifs_rename,
 669         .permission = cifs_permission,
 670 #ifdef CONFIG_CIFS_XATTR
 671         .setxattr = cifs_setxattr,
 672         .getxattr = cifs_getxattr,
 673         .listxattr = cifs_listxattr,
 674         .removexattr = cifs_removexattr,
 675 #endif
 676 };
 677
 678 const struct inode_operations cifs_symlink_inode_ops = {
 679         .readlink = generic_readlink,
 680         .follow_link = cifs_follow_link,
 681         .put_link = cifs_put_link,
 682         .permission = cifs_permission,
 683         /* BB add the following two eventually */
 684         /* revalidate: cifs_revalidate,
 685            setattr:    cifs_notify_change, *//* BB do we need notify change */
 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 file_operations cifs_file_ops = {
 695         .read = do_sync_read,
 696         .write = do_sync_write,
 697         .aio_read = generic_file_aio_read,
 698         .aio_write = cifs_file_aio_write,
 699         .open = cifs_open,
 700         .release = cifs_close,
 701         .lock = cifs_lock,
 702         .fsync = cifs_fsync,
 703         .flush = cifs_flush,
 704         .mmap  = cifs_file_mmap,
 705         .splice_read = generic_file_splice_read,
 706         .llseek = cifs_llseek,
 707 #ifdef CONFIG_CIFS_POSIX
 708         .unlocked_ioctl = cifs_ioctl,
 709 #endif /* CONFIG_CIFS_POSIX */
 710         .setlease = cifs_setlease,
 711 };
 712
 713 const struct file_operations cifs_file_direct_ops = {
 714         /* no aio, no readv -
 715            BB reevaluate whether they can be done with directio, no cache */
 716         .read = cifs_user_read,
 717         .write = cifs_user_write,
 718         .open = cifs_open,
 719         .release = cifs_close,
 720         .lock = cifs_lock,
 721         .fsync = cifs_fsync,
 722         .flush = cifs_flush,
 723         .mmap = cifs_file_mmap,
 724         .splice_read = generic_file_splice_read,
 725 #ifdef CONFIG_CIFS_POSIX
 726         .unlocked_ioctl  = cifs_ioctl,
 727 #endif /* CONFIG_CIFS_POSIX */
 728         .llseek = cifs_llseek,
 729         .setlease = cifs_setlease,
 730 };
 731 const struct file_operations cifs_file_nobrl_ops = {
 732         .read = do_sync_read,
 733         .write = do_sync_write,
 734         .aio_read = generic_file_aio_read,
 735         .aio_write = cifs_file_aio_write,
 736         .open = cifs_open,
 737         .release = cifs_close,
 738         .fsync = cifs_fsync,
 739         .flush = cifs_flush,
 740         .mmap  = cifs_file_mmap,
 741         .splice_read = generic_file_splice_read,
 742         .llseek = cifs_llseek,
 743 #ifdef CONFIG_CIFS_POSIX
 744         .unlocked_ioctl = cifs_ioctl,
 745 #endif /* CONFIG_CIFS_POSIX */
 746         .setlease = cifs_setlease,
 747 };
 748
 749 const struct file_operations cifs_file_direct_nobrl_ops = {
 750         /* no mmap, no aio, no readv -
 751            BB reevaluate whether they can be done with directio, no cache */
 752         .read = cifs_user_read,
 753         .write = cifs_user_write,
 754         .open = cifs_open,
 755         .release = cifs_close,
 756         .fsync = cifs_fsync,
 757         .flush = cifs_flush,
 758         .mmap = cifs_file_mmap,
 759         .splice_read = generic_file_splice_read,
 760 #ifdef CONFIG_CIFS_POSIX
 761         .unlocked_ioctl  = cifs_ioctl,
 762 #endif /* CONFIG_CIFS_POSIX */
 763         .llseek = cifs_llseek,
 764         .setlease = cifs_setlease,
 765 };
 766
 767 const struct file_operations cifs_dir_ops = {
 768         .readdir = cifs_readdir,
 769         .release = cifs_closedir,
 770         .read    = generic_read_dir,
 771         .unlocked_ioctl  = cifs_ioctl,
 772         .llseek = generic_file_llseek,
 773 };
 774
 775 static void
 776 cifs_init_once(void *inode)
 777 {
 778         struct cifsInodeInfo *cifsi = inode;
 779
 780         inode_init_once(&cifsi->vfs_inode);
 781         INIT_LIST_HEAD(&cifsi->lockList);
 782 }
 783
 784 static int
 785 cifs_init_inodecache(void)
 786 {
 787         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
 788                                               sizeof(struct cifsInodeInfo),
 789                                               0, (SLAB_RECLAIM_ACCOUNT|
 790                                                 SLAB_MEM_SPREAD),
 791                                               cifs_init_once);
 792         if (cifs_inode_cachep == NULL)
 793                 return -ENOMEM;
 794
 795         return 0;
 796 }
 797
 798 static void
 799 cifs_destroy_inodecache(void)
 800 {
 801         kmem_cache_destroy(cifs_inode_cachep);
 802 }
 803
 804 static int
 805 cifs_init_request_bufs(void)
 806 {
 807         if (CIFSMaxBufSize < 8192) {
 808         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
 809         Unicode path name has to fit in any SMB/CIFS path based frames */
 810                 CIFSMaxBufSize = 8192;
 811         } else if (CIFSMaxBufSize > 1024*127) {
 812                 CIFSMaxBufSize = 1024 * 127;
 813         } else {
 814                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
 815         }
 816 /*      cERROR(1, "CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize); */
 817         cifs_req_cachep = kmem_cache_create("cifs_request",
 818                                             CIFSMaxBufSize +
 819                                             MAX_CIFS_HDR_SIZE, 0,
 820                                             SLAB_HWCACHE_ALIGN, NULL);
 821         if (cifs_req_cachep == NULL)
 822                 return -ENOMEM;
 823
 824         if (cifs_min_rcv < 1)
 825                 cifs_min_rcv = 1;
 826         else if (cifs_min_rcv > 64) {
 827                 cifs_min_rcv = 64;
 828                 cERROR(1, "cifs_min_rcv set to maximum (64)");
 829         }
 830
 831         cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
 832                                                   cifs_req_cachep);
 833
 834         if (cifs_req_poolp == NULL) {
 835                 kmem_cache_destroy(cifs_req_cachep);
 836                 return -ENOMEM;
 837         }
 838         /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
 839         almost all handle based requests (but not write response, nor is it
 840         sufficient for path based requests).  A smaller size would have
 841         been more efficient (compacting multiple slab items on one 4k page)
 842         for the case in which debug was on, but this larger size allows
 843         more SMBs to use small buffer alloc and is still much more
 844         efficient to alloc 1 per page off the slab compared to 17K (5page)
 845         alloc of large cifs buffers even when page debugging is on */
 846         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
 847                         MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
 848                         NULL);
 849         if (cifs_sm_req_cachep == NULL) {
 850                 mempool_destroy(cifs_req_poolp);
 851                 kmem_cache_destroy(cifs_req_cachep);
 852                 return -ENOMEM;
 853         }
 854
 855         if (cifs_min_small < 2)
 856                 cifs_min_small = 2;
 857         else if (cifs_min_small > 256) {
 858                 cifs_min_small = 256;
 859                 cFYI(1, "cifs_min_small set to maximum (256)");
 860         }
 861
 862         cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
 863                                                      cifs_sm_req_cachep);
 864
 865         if (cifs_sm_req_poolp == NULL) {
 866                 mempool_destroy(cifs_req_poolp);
 867                 kmem_cache_destroy(cifs_req_cachep);
 868                 kmem_cache_destroy(cifs_sm_req_cachep);
 869                 return -ENOMEM;
 870         }
 871
 872         return 0;
 873 }
 874
 875 static void
 876 cifs_destroy_request_bufs(void)
 877 {
 878         mempool_destroy(cifs_req_poolp);
 879         kmem_cache_destroy(cifs_req_cachep);
 880         mempool_destroy(cifs_sm_req_poolp);
 881         kmem_cache_destroy(cifs_sm_req_cachep);
 882 }
 883
 884 static int
 885 cifs_init_mids(void)
 886 {
 887         cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
 888                                             sizeof(struct mid_q_entry), 0,
 889                                             SLAB_HWCACHE_ALIGN, NULL);
 890         if (cifs_mid_cachep == NULL)
 891                 return -ENOMEM;
 892
 893         /* 3 is a reasonable minimum number of simultaneous operations */
 894         cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
 895         if (cifs_mid_poolp == NULL) {
 896                 kmem_cache_destroy(cifs_mid_cachep);
 897                 return -ENOMEM;
 898         }
 899
 900         return 0;
 901 }
 902
 903 static void
 904 cifs_destroy_mids(void)
 905 {
 906         mempool_destroy(cifs_mid_poolp);
 907         kmem_cache_destroy(cifs_mid_cachep);
 908 }
 909
 910 static int __init
 911 init_cifs(void)
 912 {
 913         int rc = 0;
 914         cifs_proc_init();
 915         INIT_LIST_HEAD(&cifs_tcp_ses_list);
 916 #ifdef CONFIG_CIFS_EXPERIMENTAL
 917         INIT_LIST_HEAD(&GlobalDnotifyReqList);
 918         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
 919 #endif
 920 /*
 921  *  Initialize Global counters
 922  */
 923         atomic_set(&sesInfoAllocCount, 0);
 924         atomic_set(&tconInfoAllocCount, 0);
 925         atomic_set(&tcpSesAllocCount, 0);
 926         atomic_set(&tcpSesReconnectCount, 0);
 927         atomic_set(&tconInfoReconnectCount, 0);
 928
 929         atomic_set(&bufAllocCount, 0);
 930         atomic_set(&smBufAllocCount, 0);
 931 #ifdef CONFIG_CIFS_STATS2
 932         atomic_set(&totBufAllocCount, 0);
 933         atomic_set(&totSmBufAllocCount, 0);
 934 #endif /* CONFIG_CIFS_STATS2 */
 935
 936         atomic_set(&midCount, 0);
 937         GlobalCurrentXid = 0;
 938         GlobalTotalActiveXid = 0;
 939         GlobalMaxActiveXid = 0;
 940         spin_lock_init(&cifs_tcp_ses_lock);
 941         spin_lock_init(&cifs_file_list_lock);
 942         spin_lock_init(&GlobalMid_Lock);
 943
 944         if (cifs_max_pending < 2) {
 945                 cifs_max_pending = 2;
 946                 cFYI(1, "cifs_max_pending set to min of 2");
 947         } else if (cifs_max_pending > 256) {
 948                 cifs_max_pending = 256;
 949                 cFYI(1, "cifs_max_pending set to max of 256");
 950         }
 951
 952         rc = cifs_fscache_register();
 953         if (rc)
 954                 goto out_clean_proc;
 955
 956         rc = cifs_init_inodecache();
 957         if (rc)
 958                 goto out_unreg_fscache;
 959
 960         rc = cifs_init_mids();
 961         if (rc)
 962                 goto out_destroy_inodecache;
 963
 964         rc = cifs_init_request_bufs();
 965         if (rc)
 966                 goto out_destroy_mids;
 967
 968         rc = register_filesystem(&cifs_fs_type);
 969         if (rc)
 970                 goto out_destroy_request_bufs;
 971 #ifdef CONFIG_CIFS_UPCALL
 972         rc = register_key_type(&cifs_spnego_key_type);
 973         if (rc)
 974                 goto out_unregister_filesystem;
 975 #endif
 976
 977         return 0;
 978
 979 #ifdef CONFIG_CIFS_UPCALL
 980 out_unregister_filesystem:
 981         unregister_filesystem(&cifs_fs_type);
 982 #endif
 983 out_destroy_request_bufs:
 984         cifs_destroy_request_bufs();
 985 out_destroy_mids:
 986         cifs_destroy_mids();
 987 out_destroy_inodecache:
 988         cifs_destroy_inodecache();
 989 out_unreg_fscache:
 990         cifs_fscache_unregister();
 991 out_clean_proc:
 992         cifs_proc_clean();
 993         return rc;
 994 }
 995
 996 static void __exit
 997 exit_cifs(void)
 998 {
 999         cFYI(DBG2, "exit_cifs");
1000         cifs_proc_clean();
1001         cifs_fscache_unregister();
1002 #ifdef CONFIG_CIFS_DFS_UPCALL
1003         cifs_dfs_release_automount_timer();
1004 #endif
1005 #ifdef CONFIG_CIFS_UPCALL
1006         unregister_key_type(&cifs_spnego_key_type);
1007 #endif
1008         unregister_filesystem(&cifs_fs_type);
1009         cifs_destroy_inodecache();
1010         cifs_destroy_mids();
1011         cifs_destroy_request_bufs();
1012 }
1013
1014 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1015 MODULE_LICENSE("GPL");  /* combination of LGPL + GPL source behaves as GPL */
1016 MODULE_DESCRIPTION
1017     ("VFS to access servers complying with the SNIA CIFS Specification "
1018      "e.g. Samba and Windows");
1019 MODULE_VERSION(CIFS_VERSION);
1020 module_init(init_cifs)
1021 module_exit(exit_cifs)