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         INIT_RADIX_TREE(&cifs_sb->tlink_tree, GFP_KERNEL);
 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         cifs_inode->write_behind_rc = 0;
 322         /* Until the file is open and we have gotten oplock
 323         info back from the server, can not assume caching of
 324         file data or metadata */
 325         cifs_inode->clientCanCacheRead = false;
 326         cifs_inode->clientCanCacheAll = false;
 327         cifs_inode->delete_pending = false;
 328         cifs_inode->invalid_mapping = false;
 329         cifs_inode->vfs_inode.i_blkbits = 14;  /* 2**14 = CIFS_MAX_MSGSIZE */
 330         cifs_inode->server_eof = 0;
 331
 332         /* Can not set i_flags here - they get immediately overwritten
 333            to zero by the VFS */
 334 /*      cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;*/
 335         INIT_LIST_HEAD(&cifs_inode->openFileList);
 336         return &cifs_inode->vfs_inode;
 337 }
 338
 339 static void
 340 cifs_destroy_inode(struct inode *inode)
 341 {
 342         kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
 343 }
 344
 345 static void
 346 cifs_evict_inode(struct inode *inode)
 347 {
 348         truncate_inode_pages(&inode->i_data, 0);
 349         end_writeback(inode);
 350         cifs_fscache_release_inode_cookie(inode);
 351 }
 352
 353 static void
 354 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
 355 {
 356         seq_printf(s, ",addr=");
 357
 358         switch (server->addr.sockAddr.sin_family) {
 359         case AF_INET:
 360                 seq_printf(s, "%pI4", &server->addr.sockAddr.sin_addr.s_addr);
 361                 break;
 362         case AF_INET6:
 363                 seq_printf(s, "%pI6",
 364                            &server->addr.sockAddr6.sin6_addr.s6_addr);
 365                 if (server->addr.sockAddr6.sin6_scope_id)
 366                         seq_printf(s, "%%%u",
 367                                    server->addr.sockAddr6.sin6_scope_id);
 368                 break;
 369         default:
 370                 seq_printf(s, "(unknown)");
 371         }
 372 }
 373
 374 /*
 375  * cifs_show_options() is for displaying mount options in /proc/mounts.
 376  * Not all settable options are displayed but most of the important
 377  * ones are.
 378  */
 379 static int
 380 cifs_show_options(struct seq_file *s, struct vfsmount *m)
 381 {
 382         struct cifs_sb_info *cifs_sb = CIFS_SB(m->mnt_sb);
 383         struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb);
 384         struct sockaddr *srcaddr;
 385         srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
 386
 387         seq_printf(s, ",unc=%s", tcon->treeName);
 388
 389         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
 390                 seq_printf(s, ",multiuser");
 391         else if (tcon->ses->userName)
 392                 seq_printf(s, ",username=%s", tcon->ses->userName);
 393
 394         if (tcon->ses->domainName)
 395                 seq_printf(s, ",domain=%s", tcon->ses->domainName);
 396
 397         if (srcaddr->sa_family != AF_UNSPEC) {
 398                 struct sockaddr_in *saddr4;
 399                 struct sockaddr_in6 *saddr6;
 400                 saddr4 = (struct sockaddr_in *)srcaddr;
 401                 saddr6 = (struct sockaddr_in6 *)srcaddr;
 402                 if (srcaddr->sa_family == AF_INET6)
 403                         seq_printf(s, ",srcaddr=%pI6c",
 404                                    &saddr6->sin6_addr);
 405                 else if (srcaddr->sa_family == AF_INET)
 406                         seq_printf(s, ",srcaddr=%pI4",
 407                                    &saddr4->sin_addr.s_addr);
 408                 else
 409                         seq_printf(s, ",srcaddr=BAD-AF:%i",
 410                                    (int)(srcaddr->sa_family));
 411         }
 412
 413         seq_printf(s, ",uid=%d", cifs_sb->mnt_uid);
 414         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
 415                 seq_printf(s, ",forceuid");
 416         else
 417                 seq_printf(s, ",noforceuid");
 418
 419         seq_printf(s, ",gid=%d", cifs_sb->mnt_gid);
 420         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
 421                 seq_printf(s, ",forcegid");
 422         else
 423                 seq_printf(s, ",noforcegid");
 424
 425         cifs_show_address(s, tcon->ses->server);
 426
 427         if (!tcon->unix_ext)
 428                 seq_printf(s, ",file_mode=0%o,dir_mode=0%o",
 429                                            cifs_sb->mnt_file_mode,
 430                                            cifs_sb->mnt_dir_mode);
 431         if (tcon->seal)
 432                 seq_printf(s, ",seal");
 433         if (tcon->nocase)
 434                 seq_printf(s, ",nocase");
 435         if (tcon->retry)
 436                 seq_printf(s, ",hard");
 437         if (cifs_sb->prepath)
 438                 seq_printf(s, ",prepath=%s", cifs_sb->prepath);
 439         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 440                 seq_printf(s, ",posixpaths");
 441         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
 442                 seq_printf(s, ",setuids");
 443         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 444                 seq_printf(s, ",serverino");
 445         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
 446                 seq_printf(s, ",directio");
 447         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 448                 seq_printf(s, ",nouser_xattr");
 449         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 450                 seq_printf(s, ",mapchars");
 451         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
 452                 seq_printf(s, ",sfu");
 453         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 454                 seq_printf(s, ",nobrl");
 455         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
 456                 seq_printf(s, ",cifsacl");
 457         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
 458                 seq_printf(s, ",dynperm");
 459         if (m->mnt_sb->s_flags & MS_POSIXACL)
 460                 seq_printf(s, ",acl");
 461         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
 462                 seq_printf(s, ",mfsymlinks");
 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 int
 549 cifs_get_sb(struct file_system_type *fs_type,
 550             int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 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 PTR_ERR(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 rc;
 568         }
 569         sb->s_flags |= MS_ACTIVE;
 570         simple_set_mnt(mnt, sb);
 571         return 0;
 572 }
 573
 574 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 575                                    unsigned long nr_segs, loff_t pos)
 576 {
 577         struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
 578         ssize_t written;
 579
 580         written = generic_file_aio_write(iocb, iov, nr_segs, pos);
 581         if (!CIFS_I(inode)->clientCanCacheAll)
 582                 filemap_fdatawrite(inode->i_mapping);
 583         return written;
 584 }
 585
 586 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
 587 {
 588         /* origin == SEEK_END => we must revalidate the cached file length */
 589         if (origin == SEEK_END) {
 590                 int retval;
 591
 592                 /* some applications poll for the file length in this strange
 593                    way so we must seek to end on non-oplocked files by
 594                    setting the revalidate time to zero */
 595                 CIFS_I(file->f_path.dentry->d_inode)->time = 0;
 596
 597                 retval = cifs_revalidate_file(file);
 598                 if (retval < 0)
 599                         return (loff_t)retval;
 600         }
 601         return generic_file_llseek_unlocked(file, offset, origin);
 602 }
 603
 604 static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
 605 {
 606         /* note that this is called by vfs setlease with lock_flocks held
 607            to protect *lease from going away */
 608         struct inode *inode = file->f_path.dentry->d_inode;
 609         struct cifsFileInfo *cfile = file->private_data;
 610
 611         if (!(S_ISREG(inode->i_mode)))
 612                 return -EINVAL;
 613
 614         /* check if file is oplocked */
 615         if (((arg == F_RDLCK) &&
 616                 (CIFS_I(inode)->clientCanCacheRead)) ||
 617             ((arg == F_WRLCK) &&
 618                 (CIFS_I(inode)->clientCanCacheAll)))
 619                 return generic_setlease(file, arg, lease);
 620         else if (tlink_tcon(cfile->tlink)->local_lease &&
 621                  !CIFS_I(inode)->clientCanCacheRead)
 622                 /* If the server claims to support oplock on this
 623                    file, then we still need to check oplock even
 624                    if the local_lease mount option is set, but there
 625                    are servers which do not support oplock for which
 626                    this mount option may be useful if the user
 627                    knows that the file won't be changed on the server
 628                    by anyone else */
 629                 return generic_setlease(file, arg, lease);
 630         else
 631                 return -EAGAIN;
 632 }
 633
 634 struct file_system_type cifs_fs_type = {
 635         .owner = THIS_MODULE,
 636         .name = "cifs",
 637         .get_sb = cifs_get_sb,
 638         .kill_sb = kill_anon_super,
 639         /*  .fs_flags */
 640 };
 641 const struct inode_operations cifs_dir_inode_ops = {
 642         .create = cifs_create,
 643         .lookup = cifs_lookup,
 644         .getattr = cifs_getattr,
 645         .unlink = cifs_unlink,
 646         .link = cifs_hardlink,
 647         .mkdir = cifs_mkdir,
 648         .rmdir = cifs_rmdir,
 649         .rename = cifs_rename,
 650         .permission = cifs_permission,
 651 /*      revalidate:cifs_revalidate,   */
 652         .setattr = cifs_setattr,
 653         .symlink = cifs_symlink,
 654         .mknod   = cifs_mknod,
 655 #ifdef CONFIG_CIFS_XATTR
 656         .setxattr = cifs_setxattr,
 657         .getxattr = cifs_getxattr,
 658         .listxattr = cifs_listxattr,
 659         .removexattr = cifs_removexattr,
 660 #endif
 661 };
 662
 663 const struct inode_operations cifs_file_inode_ops = {
 664 /*      revalidate:cifs_revalidate, */
 665         .setattr = cifs_setattr,
 666         .getattr = cifs_getattr, /* do we need this anymore? */
 667         .rename = cifs_rename,
 668         .permission = cifs_permission,
 669 #ifdef CONFIG_CIFS_XATTR
 670         .setxattr = cifs_setxattr,
 671         .getxattr = cifs_getxattr,
 672         .listxattr = cifs_listxattr,
 673         .removexattr = cifs_removexattr,
 674 #endif
 675 };
 676
 677 const struct inode_operations cifs_symlink_inode_ops = {
 678         .readlink = generic_readlink,
 679         .follow_link = cifs_follow_link,
 680         .put_link = cifs_put_link,
 681         .permission = cifs_permission,
 682         /* BB add the following two eventually */
 683         /* revalidate: cifs_revalidate,
 684            setattr:    cifs_notify_change, *//* BB do we need notify change */
 685 #ifdef CONFIG_CIFS_XATTR
 686         .setxattr = cifs_setxattr,
 687         .getxattr = cifs_getxattr,
 688         .listxattr = cifs_listxattr,
 689         .removexattr = cifs_removexattr,
 690 #endif
 691 };
 692
 693 const struct file_operations cifs_file_ops = {
 694         .read = do_sync_read,
 695         .write = do_sync_write,
 696         .aio_read = generic_file_aio_read,
 697         .aio_write = cifs_file_aio_write,
 698         .open = cifs_open,
 699         .release = cifs_close,
 700         .lock = cifs_lock,
 701         .fsync = cifs_fsync,
 702         .flush = cifs_flush,
 703         .mmap  = cifs_file_mmap,
 704         .splice_read = generic_file_splice_read,
 705         .llseek = cifs_llseek,
 706 #ifdef CONFIG_CIFS_POSIX
 707         .unlocked_ioctl = cifs_ioctl,
 708 #endif /* CONFIG_CIFS_POSIX */
 709         .setlease = cifs_setlease,
 710 };
 711
 712 const struct file_operations cifs_file_direct_ops = {
 713         /* no aio, no readv -
 714            BB reevaluate whether they can be done with directio, no cache */
 715         .read = cifs_user_read,
 716         .write = cifs_user_write,
 717         .open = cifs_open,
 718         .release = cifs_close,
 719         .lock = cifs_lock,
 720         .fsync = cifs_fsync,
 721         .flush = cifs_flush,
 722         .mmap = cifs_file_mmap,
 723         .splice_read = generic_file_splice_read,
 724 #ifdef CONFIG_CIFS_POSIX
 725         .unlocked_ioctl  = cifs_ioctl,
 726 #endif /* CONFIG_CIFS_POSIX */
 727         .llseek = cifs_llseek,
 728         .setlease = cifs_setlease,
 729 };
 730 const struct file_operations cifs_file_nobrl_ops = {
 731         .read = do_sync_read,
 732         .write = do_sync_write,
 733         .aio_read = generic_file_aio_read,
 734         .aio_write = cifs_file_aio_write,
 735         .open = cifs_open,
 736         .release = cifs_close,
 737         .fsync = cifs_fsync,
 738         .flush = cifs_flush,
 739         .mmap  = cifs_file_mmap,
 740         .splice_read = generic_file_splice_read,
 741         .llseek = cifs_llseek,
 742 #ifdef CONFIG_CIFS_POSIX
 743         .unlocked_ioctl = cifs_ioctl,
 744 #endif /* CONFIG_CIFS_POSIX */
 745         .setlease = cifs_setlease,
 746 };
 747
 748 const struct file_operations cifs_file_direct_nobrl_ops = {
 749         /* no mmap, no aio, no readv -
 750            BB reevaluate whether they can be done with directio, no cache */
 751         .read = cifs_user_read,
 752         .write = cifs_user_write,
 753         .open = cifs_open,
 754         .release = cifs_close,
 755         .fsync = cifs_fsync,
 756         .flush = cifs_flush,
 757         .mmap = cifs_file_mmap,
 758         .splice_read = generic_file_splice_read,
 759 #ifdef CONFIG_CIFS_POSIX
 760         .unlocked_ioctl  = cifs_ioctl,
 761 #endif /* CONFIG_CIFS_POSIX */
 762         .llseek = cifs_llseek,
 763         .setlease = cifs_setlease,
 764 };
 765
 766 const struct file_operations cifs_dir_ops = {
 767         .readdir = cifs_readdir,
 768         .release = cifs_closedir,
 769         .read    = generic_read_dir,
 770         .unlocked_ioctl  = cifs_ioctl,
 771         .llseek = generic_file_llseek,
 772 };
 773
 774 static void
 775 cifs_init_once(void *inode)
 776 {
 777         struct cifsInodeInfo *cifsi = inode;
 778
 779         inode_init_once(&cifsi->vfs_inode);
 780         INIT_LIST_HEAD(&cifsi->lockList);
 781 }
 782
 783 static int
 784 cifs_init_inodecache(void)
 785 {
 786         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
 787                                               sizeof(struct cifsInodeInfo),
 788                                               0, (SLAB_RECLAIM_ACCOUNT|
 789                                                 SLAB_MEM_SPREAD),
 790                                               cifs_init_once);
 791         if (cifs_inode_cachep == NULL)
 792                 return -ENOMEM;
 793
 794         return 0;
 795 }
 796
 797 static void
 798 cifs_destroy_inodecache(void)
 799 {
 800         kmem_cache_destroy(cifs_inode_cachep);
 801 }
 802
 803 static int
 804 cifs_init_request_bufs(void)
 805 {
 806         if (CIFSMaxBufSize < 8192) {
 807         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
 808         Unicode path name has to fit in any SMB/CIFS path based frames */
 809                 CIFSMaxBufSize = 8192;
 810         } else if (CIFSMaxBufSize > 1024*127) {
 811                 CIFSMaxBufSize = 1024 * 127;
 812         } else {
 813                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
 814         }
 815 /*      cERROR(1, "CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize); */
 816         cifs_req_cachep = kmem_cache_create("cifs_request",
 817                                             CIFSMaxBufSize +
 818                                             MAX_CIFS_HDR_SIZE, 0,
 819                                             SLAB_HWCACHE_ALIGN, NULL);
 820         if (cifs_req_cachep == NULL)
 821                 return -ENOMEM;
 822
 823         if (cifs_min_rcv < 1)
 824                 cifs_min_rcv = 1;
 825         else if (cifs_min_rcv > 64) {
 826                 cifs_min_rcv = 64;
 827                 cERROR(1, "cifs_min_rcv set to maximum (64)");
 828         }
 829
 830         cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
 831                                                   cifs_req_cachep);
 832
 833         if (cifs_req_poolp == NULL) {
 834                 kmem_cache_destroy(cifs_req_cachep);
 835                 return -ENOMEM;
 836         }
 837         /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
 838         almost all handle based requests (but not write response, nor is it
 839         sufficient for path based requests).  A smaller size would have
 840         been more efficient (compacting multiple slab items on one 4k page)
 841         for the case in which debug was on, but this larger size allows
 842         more SMBs to use small buffer alloc and is still much more
 843         efficient to alloc 1 per page off the slab compared to 17K (5page)
 844         alloc of large cifs buffers even when page debugging is on */
 845         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
 846                         MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
 847                         NULL);
 848         if (cifs_sm_req_cachep == NULL) {
 849                 mempool_destroy(cifs_req_poolp);
 850                 kmem_cache_destroy(cifs_req_cachep);
 851                 return -ENOMEM;
 852         }
 853
 854         if (cifs_min_small < 2)
 855                 cifs_min_small = 2;
 856         else if (cifs_min_small > 256) {
 857                 cifs_min_small = 256;
 858                 cFYI(1, "cifs_min_small set to maximum (256)");
 859         }
 860
 861         cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
 862                                                      cifs_sm_req_cachep);
 863
 864         if (cifs_sm_req_poolp == NULL) {
 865                 mempool_destroy(cifs_req_poolp);
 866                 kmem_cache_destroy(cifs_req_cachep);
 867                 kmem_cache_destroy(cifs_sm_req_cachep);
 868                 return -ENOMEM;
 869         }
 870
 871         return 0;
 872 }
 873
 874 static void
 875 cifs_destroy_request_bufs(void)
 876 {
 877         mempool_destroy(cifs_req_poolp);
 878         kmem_cache_destroy(cifs_req_cachep);
 879         mempool_destroy(cifs_sm_req_poolp);
 880         kmem_cache_destroy(cifs_sm_req_cachep);
 881 }
 882
 883 static int
 884 cifs_init_mids(void)
 885 {
 886         cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
 887                                             sizeof(struct mid_q_entry), 0,
 888                                             SLAB_HWCACHE_ALIGN, NULL);
 889         if (cifs_mid_cachep == NULL)
 890                 return -ENOMEM;
 891
 892         /* 3 is a reasonable minimum number of simultaneous operations */
 893         cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
 894         if (cifs_mid_poolp == NULL) {
 895                 kmem_cache_destroy(cifs_mid_cachep);
 896                 return -ENOMEM;
 897         }
 898
 899         return 0;
 900 }
 901
 902 static void
 903 cifs_destroy_mids(void)
 904 {
 905         mempool_destroy(cifs_mid_poolp);
 906         kmem_cache_destroy(cifs_mid_cachep);
 907 }
 908
 909 static int __init
 910 init_cifs(void)
 911 {
 912         int rc = 0;
 913         cifs_proc_init();
 914         INIT_LIST_HEAD(&cifs_tcp_ses_list);
 915 #ifdef CONFIG_CIFS_EXPERIMENTAL
 916         INIT_LIST_HEAD(&GlobalDnotifyReqList);
 917         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
 918 #endif
 919 /*
 920  *  Initialize Global counters
 921  */
 922         atomic_set(&sesInfoAllocCount, 0);
 923         atomic_set(&tconInfoAllocCount, 0);
 924         atomic_set(&tcpSesAllocCount, 0);
 925         atomic_set(&tcpSesReconnectCount, 0);
 926         atomic_set(&tconInfoReconnectCount, 0);
 927
 928         atomic_set(&bufAllocCount, 0);
 929         atomic_set(&smBufAllocCount, 0);
 930 #ifdef CONFIG_CIFS_STATS2
 931         atomic_set(&totBufAllocCount, 0);
 932         atomic_set(&totSmBufAllocCount, 0);
 933 #endif /* CONFIG_CIFS_STATS2 */
 934
 935         atomic_set(&midCount, 0);
 936         GlobalCurrentXid = 0;
 937         GlobalTotalActiveXid = 0;
 938         GlobalMaxActiveXid = 0;
 939         memset(Local_System_Name, 0, 15);
 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)