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         /* 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_inode->clientCanCacheRead = false;
 325         cifs_inode->clientCanCacheAll = false;
 326         cifs_inode->delete_pending = false;
 327         cifs_inode->invalid_mapping = false;
 328         cifs_inode->vfs_inode.i_blkbits = 14;  /* 2**14 = CIFS_MAX_MSGSIZE */
 329         cifs_inode->server_eof = 0;
 330
 331         /* Can not set i_flags here - they get immediately overwritten
 332            to zero by the VFS */
 333 /*      cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;*/
 334         INIT_LIST_HEAD(&cifs_inode->openFileList);
 335         return &cifs_inode->vfs_inode;
 336 }
 337
 338 static void
 339 cifs_destroy_inode(struct inode *inode)
 340 {
 341         kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
 342 }
 343
 344 static void
 345 cifs_evict_inode(struct inode *inode)
 346 {
 347         truncate_inode_pages(&inode->i_data, 0);
 348         end_writeback(inode);
 349         cifs_fscache_release_inode_cookie(inode);
 350 }
 351
 352 static void
 353 cifs_show_address(struct seq_file *s, struct TCP_Server_Info *server)
 354 {
 355         seq_printf(s, ",addr=");
 356
 357         switch (server->addr.sockAddr.sin_family) {
 358         case AF_INET:
 359                 seq_printf(s, "%pI4", &server->addr.sockAddr.sin_addr.s_addr);
 360                 break;
 361         case AF_INET6:
 362                 seq_printf(s, "%pI6",
 363                            &server->addr.sockAddr6.sin6_addr.s6_addr);
 364                 if (server->addr.sockAddr6.sin6_scope_id)
 365                         seq_printf(s, "%%%u",
 366                                    server->addr.sockAddr6.sin6_scope_id);
 367                 break;
 368         default:
 369                 seq_printf(s, "(unknown)");
 370         }
 371 }
 372
 373 /*
 374  * cifs_show_options() is for displaying mount options in /proc/mounts.
 375  * Not all settable options are displayed but most of the important
 376  * ones are.
 377  */
 378 static int
 379 cifs_show_options(struct seq_file *s, struct vfsmount *m)
 380 {
 381         struct cifs_sb_info *cifs_sb = CIFS_SB(m->mnt_sb);
 382         struct cifsTconInfo *tcon = cifs_sb_master_tcon(cifs_sb);
 383         struct sockaddr *srcaddr;
 384         srcaddr = (struct sockaddr *)&tcon->ses->server->srcaddr;
 385
 386         seq_printf(s, ",unc=%s", tcon->treeName);
 387
 388         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)
 389                 seq_printf(s, ",multiuser");
 390         else if (tcon->ses->userName)
 391                 seq_printf(s, ",username=%s", tcon->ses->userName);
 392
 393         if (tcon->ses->domainName)
 394                 seq_printf(s, ",domain=%s", tcon->ses->domainName);
 395
 396         if (srcaddr->sa_family != AF_UNSPEC) {
 397                 struct sockaddr_in *saddr4;
 398                 struct sockaddr_in6 *saddr6;
 399                 saddr4 = (struct sockaddr_in *)srcaddr;
 400                 saddr6 = (struct sockaddr_in6 *)srcaddr;
 401                 if (srcaddr->sa_family == AF_INET6)
 402                         seq_printf(s, ",srcaddr=%pI6c",
 403                                    &saddr6->sin6_addr);
 404                 else if (srcaddr->sa_family == AF_INET)
 405                         seq_printf(s, ",srcaddr=%pI4",
 406                                    &saddr4->sin_addr.s_addr);
 407                 else
 408                         seq_printf(s, ",srcaddr=BAD-AF:%i",
 409                                    (int)(srcaddr->sa_family));
 410         }
 411
 412         seq_printf(s, ",uid=%d", cifs_sb->mnt_uid);
 413         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_UID)
 414                 seq_printf(s, ",forceuid");
 415         else
 416                 seq_printf(s, ",noforceuid");
 417
 418         seq_printf(s, ",gid=%d", cifs_sb->mnt_gid);
 419         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_OVERR_GID)
 420                 seq_printf(s, ",forcegid");
 421         else
 422                 seq_printf(s, ",noforcegid");
 423
 424         cifs_show_address(s, tcon->ses->server);
 425
 426         if (!tcon->unix_ext)
 427                 seq_printf(s, ",file_mode=0%o,dir_mode=0%o",
 428                                            cifs_sb->mnt_file_mode,
 429                                            cifs_sb->mnt_dir_mode);
 430         if (tcon->seal)
 431                 seq_printf(s, ",seal");
 432         if (tcon->nocase)
 433                 seq_printf(s, ",nocase");
 434         if (tcon->retry)
 435                 seq_printf(s, ",hard");
 436         if (cifs_sb->prepath)
 437                 seq_printf(s, ",prepath=%s", cifs_sb->prepath);
 438         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 439                 seq_printf(s, ",posixpaths");
 440         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
 441                 seq_printf(s, ",setuids");
 442         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 443                 seq_printf(s, ",serverino");
 444         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
 445                 seq_printf(s, ",directio");
 446         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 447                 seq_printf(s, ",nouser_xattr");
 448         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 449                 seq_printf(s, ",mapchars");
 450         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
 451                 seq_printf(s, ",sfu");
 452         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 453                 seq_printf(s, ",nobrl");
 454         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
 455                 seq_printf(s, ",cifsacl");
 456         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
 457                 seq_printf(s, ",dynperm");
 458         if (m->mnt_sb->s_flags & MS_POSIXACL)
 459                 seq_printf(s, ",acl");
 460         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MF_SYMLINKS)
 461                 seq_printf(s, ",mfsymlinks");
 462
 463         seq_printf(s, ",rsize=%d", cifs_sb->rsize);
 464         seq_printf(s, ",wsize=%d", cifs_sb->wsize);
 465
 466         return 0;
 467 }
 468
 469 static void cifs_umount_begin(struct super_block *sb)
 470 {
 471         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 472         struct cifsTconInfo *tcon;
 473
 474         if (cifs_sb == NULL)
 475                 return;
 476
 477         tcon = cifs_sb_master_tcon(cifs_sb);
 478
 479         spin_lock(&cifs_tcp_ses_lock);
 480         if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
 481                 /* we have other mounts to same share or we have
 482                    already tried to force umount this and woken up
 483                    all waiting network requests, nothing to do */
 484                 spin_unlock(&cifs_tcp_ses_lock);
 485                 return;
 486         } else if (tcon->tc_count == 1)
 487                 tcon->tidStatus = CifsExiting;
 488         spin_unlock(&cifs_tcp_ses_lock);
 489
 490         /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
 491         /* cancel_notify_requests(tcon); */
 492         if (tcon->ses && tcon->ses->server) {
 493                 cFYI(1, "wake up tasks now - umount begin not complete");
 494                 wake_up_all(&tcon->ses->server->request_q);
 495                 wake_up_all(&tcon->ses->server->response_q);
 496                 msleep(1); /* yield */
 497                 /* we have to kick the requests once more */
 498                 wake_up_all(&tcon->ses->server->response_q);
 499                 msleep(1);
 500         }
 501
 502         return;
 503 }
 504
 505 #ifdef CONFIG_CIFS_STATS2
 506 static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt)
 507 {
 508         /* BB FIXME */
 509         return 0;
 510 }
 511 #endif
 512
 513 static int cifs_remount(struct super_block *sb, int *flags, char *data)
 514 {
 515         *flags |= MS_NODIRATIME;
 516         return 0;
 517 }
 518
 519 static int cifs_drop_inode(struct inode *inode)
 520 {
 521         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 522
 523         /* no serverino => unconditional eviction */
 524         return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
 525                 generic_drop_inode(inode);
 526 }
 527
 528 static const struct super_operations cifs_super_ops = {
 529         .put_super = cifs_put_super,
 530         .statfs = cifs_statfs,
 531         .alloc_inode = cifs_alloc_inode,
 532         .destroy_inode = cifs_destroy_inode,
 533         .drop_inode     = cifs_drop_inode,
 534         .evict_inode    = cifs_evict_inode,
 535 /*      .delete_inode   = cifs_delete_inode,  */  /* Do not need above
 536         function unless later we add lazy close of inodes or unless the
 537         kernel forgets to call us with the same number of releases (closes)
 538         as opens */
 539         .show_options = cifs_show_options,
 540         .umount_begin   = cifs_umount_begin,
 541         .remount_fs = cifs_remount,
 542 #ifdef CONFIG_CIFS_STATS2
 543         .show_stats = cifs_show_stats,
 544 #endif
 545 };
 546
 547 static struct dentry *
 548 cifs_do_mount(struct file_system_type *fs_type,
 549             int flags, const char *dev_name, void *data)
 550 {
 551         int rc;
 552         struct super_block *sb;
 553
 554         sb = sget(fs_type, NULL, set_anon_super, NULL);
 555
 556         cFYI(1, "Devname: %s flags: %d ", dev_name, flags);
 557
 558         if (IS_ERR(sb))
 559                 return ERR_CAST(sb);
 560
 561         sb->s_flags = flags;
 562
 563         rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
 564         if (rc) {
 565                 deactivate_locked_super(sb);
 566                 return ERR_PTR(rc);
 567         }
 568         sb->s_flags |= MS_ACTIVE;
 569         return dget(sb->s_root);
 570 }
 571
 572 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 573                                    unsigned long nr_segs, loff_t pos)
 574 {
 575         struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
 576         ssize_t written;
 577
 578         written = generic_file_aio_write(iocb, iov, nr_segs, pos);
 579         if (!CIFS_I(inode)->clientCanCacheAll)
 580                 filemap_fdatawrite(inode->i_mapping);
 581         return written;
 582 }
 583
 584 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
 585 {
 586         /* origin == SEEK_END => we must revalidate the cached file length */
 587         if (origin == SEEK_END) {
 588                 int retval;
 589
 590                 /* some applications poll for the file length in this strange
 591                    way so we must seek to end on non-oplocked files by
 592                    setting the revalidate time to zero */
 593                 CIFS_I(file->f_path.dentry->d_inode)->time = 0;
 594
 595                 retval = cifs_revalidate_file(file);
 596                 if (retval < 0)
 597                         return (loff_t)retval;
 598         }
 599         return generic_file_llseek_unlocked(file, offset, origin);
 600 }
 601
 602 static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
 603 {
 604         /* note that this is called by vfs setlease with lock_flocks held
 605            to protect *lease from going away */
 606         struct inode *inode = file->f_path.dentry->d_inode;
 607         struct cifsFileInfo *cfile = file->private_data;
 608
 609         if (!(S_ISREG(inode->i_mode)))
 610                 return -EINVAL;
 611
 612         /* check if file is oplocked */
 613         if (((arg == F_RDLCK) &&
 614                 (CIFS_I(inode)->clientCanCacheRead)) ||
 615             ((arg == F_WRLCK) &&
 616                 (CIFS_I(inode)->clientCanCacheAll)))
 617                 return generic_setlease(file, arg, lease);
 618         else if (tlink_tcon(cfile->tlink)->local_lease &&
 619                  !CIFS_I(inode)->clientCanCacheRead)
 620                 /* If the server claims to support oplock on this
 621                    file, then we still need to check oplock even
 622                    if the local_lease mount option is set, but there
 623                    are servers which do not support oplock for which
 624                    this mount option may be useful if the user
 625                    knows that the file won't be changed on the server
 626                    by anyone else */
 627                 return generic_setlease(file, arg, lease);
 628         else
 629                 return -EAGAIN;
 630 }
 631
 632 struct file_system_type cifs_fs_type = {
 633         .owner = THIS_MODULE,
 634         .name = "cifs",
 635         .mount = cifs_do_mount,
 636         .kill_sb = kill_anon_super,
 637         /*  .fs_flags */
 638 };
 639 const struct inode_operations cifs_dir_inode_ops = {
 640         .create = cifs_create,
 641         .lookup = cifs_lookup,
 642         .getattr = cifs_getattr,
 643         .unlink = cifs_unlink,
 644         .link = cifs_hardlink,
 645         .mkdir = cifs_mkdir,
 646         .rmdir = cifs_rmdir,
 647         .rename = cifs_rename,
 648         .permission = cifs_permission,
 649 /*      revalidate:cifs_revalidate,   */
 650         .setattr = cifs_setattr,
 651         .symlink = cifs_symlink,
 652         .mknod   = cifs_mknod,
 653 #ifdef CONFIG_CIFS_XATTR
 654         .setxattr = cifs_setxattr,
 655         .getxattr = cifs_getxattr,
 656         .listxattr = cifs_listxattr,
 657         .removexattr = cifs_removexattr,
 658 #endif
 659 };
 660
 661 const struct inode_operations cifs_file_inode_ops = {
 662 /*      revalidate:cifs_revalidate, */
 663         .setattr = cifs_setattr,
 664         .getattr = cifs_getattr, /* do we need this anymore? */
 665         .rename = cifs_rename,
 666         .permission = cifs_permission,
 667 #ifdef CONFIG_CIFS_XATTR
 668         .setxattr = cifs_setxattr,
 669         .getxattr = cifs_getxattr,
 670         .listxattr = cifs_listxattr,
 671         .removexattr = cifs_removexattr,
 672 #endif
 673 };
 674
 675 const struct inode_operations cifs_symlink_inode_ops = {
 676         .readlink = generic_readlink,
 677         .follow_link = cifs_follow_link,
 678         .put_link = cifs_put_link,
 679         .permission = cifs_permission,
 680         /* BB add the following two eventually */
 681         /* revalidate: cifs_revalidate,
 682            setattr:    cifs_notify_change, *//* BB do we need notify change */
 683 #ifdef CONFIG_CIFS_XATTR
 684         .setxattr = cifs_setxattr,
 685         .getxattr = cifs_getxattr,
 686         .listxattr = cifs_listxattr,
 687         .removexattr = cifs_removexattr,
 688 #endif
 689 };
 690
 691 const struct file_operations cifs_file_ops = {
 692         .read = do_sync_read,
 693         .write = do_sync_write,
 694         .aio_read = generic_file_aio_read,
 695         .aio_write = cifs_file_aio_write,
 696         .open = cifs_open,
 697         .release = cifs_close,
 698         .lock = cifs_lock,
 699         .fsync = cifs_fsync,
 700         .flush = cifs_flush,
 701         .mmap  = cifs_file_mmap,
 702         .splice_read = generic_file_splice_read,
 703         .llseek = cifs_llseek,
 704 #ifdef CONFIG_CIFS_POSIX
 705         .unlocked_ioctl = cifs_ioctl,
 706 #endif /* CONFIG_CIFS_POSIX */
 707         .setlease = cifs_setlease,
 708 };
 709
 710 const struct file_operations cifs_file_direct_ops = {
 711         /* no aio, no readv -
 712            BB reevaluate whether they can be done with directio, no cache */
 713         .read = cifs_user_read,
 714         .write = cifs_user_write,
 715         .open = cifs_open,
 716         .release = cifs_close,
 717         .lock = cifs_lock,
 718         .fsync = cifs_fsync,
 719         .flush = cifs_flush,
 720         .mmap = cifs_file_mmap,
 721         .splice_read = generic_file_splice_read,
 722 #ifdef CONFIG_CIFS_POSIX
 723         .unlocked_ioctl  = cifs_ioctl,
 724 #endif /* CONFIG_CIFS_POSIX */
 725         .llseek = cifs_llseek,
 726         .setlease = cifs_setlease,
 727 };
 728 const struct file_operations cifs_file_nobrl_ops = {
 729         .read = do_sync_read,
 730         .write = do_sync_write,
 731         .aio_read = generic_file_aio_read,
 732         .aio_write = cifs_file_aio_write,
 733         .open = cifs_open,
 734         .release = cifs_close,
 735         .fsync = cifs_fsync,
 736         .flush = cifs_flush,
 737         .mmap  = cifs_file_mmap,
 738         .splice_read = generic_file_splice_read,
 739         .llseek = cifs_llseek,
 740 #ifdef CONFIG_CIFS_POSIX
 741         .unlocked_ioctl = cifs_ioctl,
 742 #endif /* CONFIG_CIFS_POSIX */
 743         .setlease = cifs_setlease,
 744 };
 745
 746 const struct file_operations cifs_file_direct_nobrl_ops = {
 747         /* no mmap, no aio, no readv -
 748            BB reevaluate whether they can be done with directio, no cache */
 749         .read = cifs_user_read,
 750         .write = cifs_user_write,
 751         .open = cifs_open,
 752         .release = cifs_close,
 753         .fsync = cifs_fsync,
 754         .flush = cifs_flush,
 755         .mmap = cifs_file_mmap,
 756         .splice_read = generic_file_splice_read,
 757 #ifdef CONFIG_CIFS_POSIX
 758         .unlocked_ioctl  = cifs_ioctl,
 759 #endif /* CONFIG_CIFS_POSIX */
 760         .llseek = cifs_llseek,
 761         .setlease = cifs_setlease,
 762 };
 763
 764 const struct file_operations cifs_dir_ops = {
 765         .readdir = cifs_readdir,
 766         .release = cifs_closedir,
 767         .read    = generic_read_dir,
 768         .unlocked_ioctl  = cifs_ioctl,
 769         .llseek = generic_file_llseek,
 770 };
 771
 772 static void
 773 cifs_init_once(void *inode)
 774 {
 775         struct cifsInodeInfo *cifsi = inode;
 776
 777         inode_init_once(&cifsi->vfs_inode);
 778         INIT_LIST_HEAD(&cifsi->lockList);
 779 }
 780
 781 static int
 782 cifs_init_inodecache(void)
 783 {
 784         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
 785                                               sizeof(struct cifsInodeInfo),
 786                                               0, (SLAB_RECLAIM_ACCOUNT|
 787                                                 SLAB_MEM_SPREAD),
 788                                               cifs_init_once);
 789         if (cifs_inode_cachep == NULL)
 790                 return -ENOMEM;
 791
 792         return 0;
 793 }
 794
 795 static void
 796 cifs_destroy_inodecache(void)
 797 {
 798         kmem_cache_destroy(cifs_inode_cachep);
 799 }
 800
 801 static int
 802 cifs_init_request_bufs(void)
 803 {
 804         if (CIFSMaxBufSize < 8192) {
 805         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
 806         Unicode path name has to fit in any SMB/CIFS path based frames */
 807                 CIFSMaxBufSize = 8192;
 808         } else if (CIFSMaxBufSize > 1024*127) {
 809                 CIFSMaxBufSize = 1024 * 127;
 810         } else {
 811                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
 812         }
 813 /*      cERROR(1, "CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize); */
 814         cifs_req_cachep = kmem_cache_create("cifs_request",
 815                                             CIFSMaxBufSize +
 816                                             MAX_CIFS_HDR_SIZE, 0,
 817                                             SLAB_HWCACHE_ALIGN, NULL);
 818         if (cifs_req_cachep == NULL)
 819                 return -ENOMEM;
 820
 821         if (cifs_min_rcv < 1)
 822                 cifs_min_rcv = 1;
 823         else if (cifs_min_rcv > 64) {
 824                 cifs_min_rcv = 64;
 825                 cERROR(1, "cifs_min_rcv set to maximum (64)");
 826         }
 827
 828         cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
 829                                                   cifs_req_cachep);
 830
 831         if (cifs_req_poolp == NULL) {
 832                 kmem_cache_destroy(cifs_req_cachep);
 833                 return -ENOMEM;
 834         }
 835         /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
 836         almost all handle based requests (but not write response, nor is it
 837         sufficient for path based requests).  A smaller size would have
 838         been more efficient (compacting multiple slab items on one 4k page)
 839         for the case in which debug was on, but this larger size allows
 840         more SMBs to use small buffer alloc and is still much more
 841         efficient to alloc 1 per page off the slab compared to 17K (5page)
 842         alloc of large cifs buffers even when page debugging is on */
 843         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
 844                         MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
 845                         NULL);
 846         if (cifs_sm_req_cachep == NULL) {
 847                 mempool_destroy(cifs_req_poolp);
 848                 kmem_cache_destroy(cifs_req_cachep);
 849                 return -ENOMEM;
 850         }
 851
 852         if (cifs_min_small < 2)
 853                 cifs_min_small = 2;
 854         else if (cifs_min_small > 256) {
 855                 cifs_min_small = 256;
 856                 cFYI(1, "cifs_min_small set to maximum (256)");
 857         }
 858
 859         cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
 860                                                      cifs_sm_req_cachep);
 861
 862         if (cifs_sm_req_poolp == NULL) {
 863                 mempool_destroy(cifs_req_poolp);
 864                 kmem_cache_destroy(cifs_req_cachep);
 865                 kmem_cache_destroy(cifs_sm_req_cachep);
 866                 return -ENOMEM;
 867         }
 868
 869         return 0;
 870 }
 871
 872 static void
 873 cifs_destroy_request_bufs(void)
 874 {
 875         mempool_destroy(cifs_req_poolp);
 876         kmem_cache_destroy(cifs_req_cachep);
 877         mempool_destroy(cifs_sm_req_poolp);
 878         kmem_cache_destroy(cifs_sm_req_cachep);
 879 }
 880
 881 static int
 882 cifs_init_mids(void)
 883 {
 884         cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
 885                                             sizeof(struct mid_q_entry), 0,
 886                                             SLAB_HWCACHE_ALIGN, NULL);
 887         if (cifs_mid_cachep == NULL)
 888                 return -ENOMEM;
 889
 890         /* 3 is a reasonable minimum number of simultaneous operations */
 891         cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
 892         if (cifs_mid_poolp == NULL) {
 893                 kmem_cache_destroy(cifs_mid_cachep);
 894                 return -ENOMEM;
 895         }
 896
 897         return 0;
 898 }
 899
 900 static void
 901 cifs_destroy_mids(void)
 902 {
 903         mempool_destroy(cifs_mid_poolp);
 904         kmem_cache_destroy(cifs_mid_cachep);
 905 }
 906
 907 static int __init
 908 init_cifs(void)
 909 {
 910         int rc = 0;
 911         cifs_proc_init();
 912         INIT_LIST_HEAD(&cifs_tcp_ses_list);
 913 #ifdef CONFIG_CIFS_EXPERIMENTAL
 914         INIT_LIST_HEAD(&GlobalDnotifyReqList);
 915         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
 916 #endif
 917 /*
 918  *  Initialize Global counters
 919  */
 920         atomic_set(&sesInfoAllocCount, 0);
 921         atomic_set(&tconInfoAllocCount, 0);
 922         atomic_set(&tcpSesAllocCount, 0);
 923         atomic_set(&tcpSesReconnectCount, 0);
 924         atomic_set(&tconInfoReconnectCount, 0);
 925
 926         atomic_set(&bufAllocCount, 0);
 927         atomic_set(&smBufAllocCount, 0);
 928 #ifdef CONFIG_CIFS_STATS2
 929         atomic_set(&totBufAllocCount, 0);
 930         atomic_set(&totSmBufAllocCount, 0);
 931 #endif /* CONFIG_CIFS_STATS2 */
 932
 933         atomic_set(&midCount, 0);
 934         GlobalCurrentXid = 0;
 935         GlobalTotalActiveXid = 0;
 936         GlobalMaxActiveXid = 0;
 937         memset(Local_System_Name, 0, 15);
 938         spin_lock_init(&cifs_tcp_ses_lock);
 939         spin_lock_init(&cifs_file_list_lock);
 940         spin_lock_init(&GlobalMid_Lock);
 941
 942         if (cifs_max_pending < 2) {
 943                 cifs_max_pending = 2;
 944                 cFYI(1, "cifs_max_pending set to min of 2");
 945         } else if (cifs_max_pending > 256) {
 946                 cifs_max_pending = 256;
 947                 cFYI(1, "cifs_max_pending set to max of 256");
 948         }
 949
 950         rc = cifs_fscache_register();
 951         if (rc)
 952                 goto out_clean_proc;
 953
 954         rc = cifs_init_inodecache();
 955         if (rc)
 956                 goto out_unreg_fscache;
 957
 958         rc = cifs_init_mids();
 959         if (rc)
 960                 goto out_destroy_inodecache;
 961
 962         rc = cifs_init_request_bufs();
 963         if (rc)
 964                 goto out_destroy_mids;
 965
 966         rc = register_filesystem(&cifs_fs_type);
 967         if (rc)
 968                 goto out_destroy_request_bufs;
 969 #ifdef CONFIG_CIFS_UPCALL
 970         rc = register_key_type(&cifs_spnego_key_type);
 971         if (rc)
 972                 goto out_unregister_filesystem;
 973 #endif
 974
 975         return 0;
 976
 977 #ifdef CONFIG_CIFS_UPCALL
 978 out_unregister_filesystem:
 979         unregister_filesystem(&cifs_fs_type);
 980 #endif
 981 out_destroy_request_bufs:
 982         cifs_destroy_request_bufs();
 983 out_destroy_mids:
 984         cifs_destroy_mids();
 985 out_destroy_inodecache:
 986         cifs_destroy_inodecache();
 987 out_unreg_fscache:
 988         cifs_fscache_unregister();
 989 out_clean_proc:
 990         cifs_proc_clean();
 991         return rc;
 992 }
 993
 994 static void __exit
 995 exit_cifs(void)
 996 {
 997         cFYI(DBG2, "exit_cifs");
 998         cifs_proc_clean();
 999         cifs_fscache_unregister();
1000 #ifdef CONFIG_CIFS_DFS_UPCALL
1001         cifs_dfs_release_automount_timer();
1002 #endif
1003 #ifdef CONFIG_CIFS_UPCALL
1004         unregister_key_type(&cifs_spnego_key_type);
1005 #endif
1006         unregister_filesystem(&cifs_fs_type);
1007         cifs_destroy_inodecache();
1008         cifs_destroy_mids();
1009         cifs_destroy_request_bufs();
1010 }
1011
1012 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1013 MODULE_LICENSE("GPL");  /* combination of LGPL + GPL source behaves as GPL */
1014 MODULE_DESCRIPTION
1015     ("VFS to access servers complying with the SNIA CIFS Specification "
1016      "e.g. Samba and Windows");
1017 MODULE_VERSION(CIFS_VERSION);
1018 module_init(init_cifs)
1019 module_exit(exit_cifs)