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         struct sockaddr_in *sa = (struct sockaddr_in *) &server->dstaddr;
 355         struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *) &server->dstaddr;
 356
 357         seq_printf(s, ",addr=");
 358
 359         switch (server->dstaddr.ss_family) {
 360         case AF_INET:
 361                 seq_printf(s, "%pI4", &sa->sin_addr.s_addr);
 362                 break;
 363         case AF_INET6:
 364                 seq_printf(s, "%pI6", &sa6->sin6_addr.s6_addr);
 365                 if (sa6->sin6_scope_id)
 366                         seq_printf(s, "%%%u", sa6->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         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
 463                 seq_printf(s, ",fsc");
 464
 465         seq_printf(s, ",rsize=%d", cifs_sb->rsize);
 466         seq_printf(s, ",wsize=%d", cifs_sb->wsize);
 467         /* convert actimeo and display it in seconds */
 468                 seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);
 469
 470         return 0;
 471 }
 472
 473 static void cifs_umount_begin(struct super_block *sb)
 474 {
 475         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 476         struct cifsTconInfo *tcon;
 477
 478         if (cifs_sb == NULL)
 479                 return;
 480
 481         tcon = cifs_sb_master_tcon(cifs_sb);
 482
 483         spin_lock(&cifs_tcp_ses_lock);
 484         if ((tcon->tc_count > 1) || (tcon->tidStatus == CifsExiting)) {
 485                 /* we have other mounts to same share or we have
 486                    already tried to force umount this and woken up
 487                    all waiting network requests, nothing to do */
 488                 spin_unlock(&cifs_tcp_ses_lock);
 489                 return;
 490         } else if (tcon->tc_count == 1)
 491                 tcon->tidStatus = CifsExiting;
 492         spin_unlock(&cifs_tcp_ses_lock);
 493
 494         /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
 495         /* cancel_notify_requests(tcon); */
 496         if (tcon->ses && tcon->ses->server) {
 497                 cFYI(1, "wake up tasks now - umount begin not complete");
 498                 wake_up_all(&tcon->ses->server->request_q);
 499                 wake_up_all(&tcon->ses->server->response_q);
 500                 msleep(1); /* yield */
 501                 /* we have to kick the requests once more */
 502                 wake_up_all(&tcon->ses->server->response_q);
 503                 msleep(1);
 504         }
 505
 506         return;
 507 }
 508
 509 #ifdef CONFIG_CIFS_STATS2
 510 static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt)
 511 {
 512         /* BB FIXME */
 513         return 0;
 514 }
 515 #endif
 516
 517 static int cifs_remount(struct super_block *sb, int *flags, char *data)
 518 {
 519         *flags |= MS_NODIRATIME;
 520         return 0;
 521 }
 522
 523 static int cifs_drop_inode(struct inode *inode)
 524 {
 525         struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
 526
 527         /* no serverino => unconditional eviction */
 528         return !(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) ||
 529                 generic_drop_inode(inode);
 530 }
 531
 532 static const struct super_operations cifs_super_ops = {
 533         .put_super = cifs_put_super,
 534         .statfs = cifs_statfs,
 535         .alloc_inode = cifs_alloc_inode,
 536         .destroy_inode = cifs_destroy_inode,
 537         .drop_inode     = cifs_drop_inode,
 538         .evict_inode    = cifs_evict_inode,
 539 /*      .delete_inode   = cifs_delete_inode,  */  /* Do not need above
 540         function unless later we add lazy close of inodes or unless the
 541         kernel forgets to call us with the same number of releases (closes)
 542         as opens */
 543         .show_options = cifs_show_options,
 544         .umount_begin   = cifs_umount_begin,
 545         .remount_fs = cifs_remount,
 546 #ifdef CONFIG_CIFS_STATS2
 547         .show_stats = cifs_show_stats,
 548 #endif
 549 };
 550
 551 static struct dentry *
 552 cifs_do_mount(struct file_system_type *fs_type,
 553             int flags, const char *dev_name, void *data)
 554 {
 555         int rc;
 556         struct super_block *sb;
 557
 558         sb = sget(fs_type, NULL, set_anon_super, NULL);
 559
 560         cFYI(1, "Devname: %s flags: %d ", dev_name, flags);
 561
 562         if (IS_ERR(sb))
 563                 return ERR_CAST(sb);
 564
 565         sb->s_flags = flags;
 566
 567         rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
 568         if (rc) {
 569                 deactivate_locked_super(sb);
 570                 return ERR_PTR(rc);
 571         }
 572         sb->s_flags |= MS_ACTIVE;
 573         return dget(sb->s_root);
 574 }
 575
 576 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 577                                    unsigned long nr_segs, loff_t pos)
 578 {
 579         struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
 580         ssize_t written;
 581
 582         written = generic_file_aio_write(iocb, iov, nr_segs, pos);
 583         if (!CIFS_I(inode)->clientCanCacheAll)
 584                 filemap_fdatawrite(inode->i_mapping);
 585         return written;
 586 }
 587
 588 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
 589 {
 590         /* origin == SEEK_END => we must revalidate the cached file length */
 591         if (origin == SEEK_END) {
 592                 int retval;
 593
 594                 /* some applications poll for the file length in this strange
 595                    way so we must seek to end on non-oplocked files by
 596                    setting the revalidate time to zero */
 597                 CIFS_I(file->f_path.dentry->d_inode)->time = 0;
 598
 599                 retval = cifs_revalidate_file(file);
 600                 if (retval < 0)
 601                         return (loff_t)retval;
 602         }
 603         return generic_file_llseek_unlocked(file, offset, origin);
 604 }
 605
 606 static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
 607 {
 608         /* note that this is called by vfs setlease with lock_flocks held
 609            to protect *lease from going away */
 610         struct inode *inode = file->f_path.dentry->d_inode;
 611         struct cifsFileInfo *cfile = file->private_data;
 612
 613         if (!(S_ISREG(inode->i_mode)))
 614                 return -EINVAL;
 615
 616         /* check if file is oplocked */
 617         if (((arg == F_RDLCK) &&
 618                 (CIFS_I(inode)->clientCanCacheRead)) ||
 619             ((arg == F_WRLCK) &&
 620                 (CIFS_I(inode)->clientCanCacheAll)))
 621                 return generic_setlease(file, arg, lease);
 622         else if (tlink_tcon(cfile->tlink)->local_lease &&
 623                  !CIFS_I(inode)->clientCanCacheRead)
 624                 /* If the server claims to support oplock on this
 625                    file, then we still need to check oplock even
 626                    if the local_lease mount option is set, but there
 627                    are servers which do not support oplock for which
 628                    this mount option may be useful if the user
 629                    knows that the file won't be changed on the server
 630                    by anyone else */
 631                 return generic_setlease(file, arg, lease);
 632         else
 633                 return -EAGAIN;
 634 }
 635
 636 struct file_system_type cifs_fs_type = {
 637         .owner = THIS_MODULE,
 638         .name = "cifs",
 639         .mount = cifs_do_mount,
 640         .kill_sb = kill_anon_super,
 641         /*  .fs_flags */
 642 };
 643 const struct inode_operations cifs_dir_inode_ops = {
 644         .create = cifs_create,
 645         .lookup = cifs_lookup,
 646         .getattr = cifs_getattr,
 647         .unlink = cifs_unlink,
 648         .link = cifs_hardlink,
 649         .mkdir = cifs_mkdir,
 650         .rmdir = cifs_rmdir,
 651         .rename = cifs_rename,
 652         .permission = cifs_permission,
 653 /*      revalidate:cifs_revalidate,   */
 654         .setattr = cifs_setattr,
 655         .symlink = cifs_symlink,
 656         .mknod   = cifs_mknod,
 657 #ifdef CONFIG_CIFS_XATTR
 658         .setxattr = cifs_setxattr,
 659         .getxattr = cifs_getxattr,
 660         .listxattr = cifs_listxattr,
 661         .removexattr = cifs_removexattr,
 662 #endif
 663 };
 664
 665 const struct inode_operations cifs_file_inode_ops = {
 666 /*      revalidate:cifs_revalidate, */
 667         .setattr = cifs_setattr,
 668         .getattr = cifs_getattr, /* do we need this anymore? */
 669         .rename = cifs_rename,
 670         .permission = cifs_permission,
 671 #ifdef CONFIG_CIFS_XATTR
 672         .setxattr = cifs_setxattr,
 673         .getxattr = cifs_getxattr,
 674         .listxattr = cifs_listxattr,
 675         .removexattr = cifs_removexattr,
 676 #endif
 677 };
 678
 679 const struct inode_operations cifs_symlink_inode_ops = {
 680         .readlink = generic_readlink,
 681         .follow_link = cifs_follow_link,
 682         .put_link = cifs_put_link,
 683         .permission = cifs_permission,
 684         /* BB add the following two eventually */
 685         /* revalidate: cifs_revalidate,
 686            setattr:    cifs_notify_change, *//* BB do we need notify change */
 687 #ifdef CONFIG_CIFS_XATTR
 688         .setxattr = cifs_setxattr,
 689         .getxattr = cifs_getxattr,
 690         .listxattr = cifs_listxattr,
 691         .removexattr = cifs_removexattr,
 692 #endif
 693 };
 694
 695 const struct file_operations cifs_file_ops = {
 696         .read = do_sync_read,
 697         .write = do_sync_write,
 698         .aio_read = generic_file_aio_read,
 699         .aio_write = cifs_file_aio_write,
 700         .open = cifs_open,
 701         .release = cifs_close,
 702         .lock = cifs_lock,
 703         .fsync = cifs_fsync,
 704         .flush = cifs_flush,
 705         .mmap  = cifs_file_mmap,
 706         .splice_read = generic_file_splice_read,
 707         .llseek = cifs_llseek,
 708 #ifdef CONFIG_CIFS_POSIX
 709         .unlocked_ioctl = cifs_ioctl,
 710 #endif /* CONFIG_CIFS_POSIX */
 711         .setlease = cifs_setlease,
 712 };
 713
 714 const struct file_operations cifs_file_direct_ops = {
 715         /* no aio, no readv -
 716            BB reevaluate whether they can be done with directio, no cache */
 717         .read = cifs_user_read,
 718         .write = cifs_user_write,
 719         .open = cifs_open,
 720         .release = cifs_close,
 721         .lock = cifs_lock,
 722         .fsync = cifs_fsync,
 723         .flush = cifs_flush,
 724         .mmap = cifs_file_mmap,
 725         .splice_read = generic_file_splice_read,
 726 #ifdef CONFIG_CIFS_POSIX
 727         .unlocked_ioctl  = cifs_ioctl,
 728 #endif /* CONFIG_CIFS_POSIX */
 729         .llseek = cifs_llseek,
 730         .setlease = cifs_setlease,
 731 };
 732 const struct file_operations cifs_file_nobrl_ops = {
 733         .read = do_sync_read,
 734         .write = do_sync_write,
 735         .aio_read = generic_file_aio_read,
 736         .aio_write = cifs_file_aio_write,
 737         .open = cifs_open,
 738         .release = cifs_close,
 739         .fsync = cifs_fsync,
 740         .flush = cifs_flush,
 741         .mmap  = cifs_file_mmap,
 742         .splice_read = generic_file_splice_read,
 743         .llseek = cifs_llseek,
 744 #ifdef CONFIG_CIFS_POSIX
 745         .unlocked_ioctl = cifs_ioctl,
 746 #endif /* CONFIG_CIFS_POSIX */
 747         .setlease = cifs_setlease,
 748 };
 749
 750 const struct file_operations cifs_file_direct_nobrl_ops = {
 751         /* no mmap, no aio, no readv -
 752            BB reevaluate whether they can be done with directio, no cache */
 753         .read = cifs_user_read,
 754         .write = cifs_user_write,
 755         .open = cifs_open,
 756         .release = cifs_close,
 757         .fsync = cifs_fsync,
 758         .flush = cifs_flush,
 759         .mmap = cifs_file_mmap,
 760         .splice_read = generic_file_splice_read,
 761 #ifdef CONFIG_CIFS_POSIX
 762         .unlocked_ioctl  = cifs_ioctl,
 763 #endif /* CONFIG_CIFS_POSIX */
 764         .llseek = cifs_llseek,
 765         .setlease = cifs_setlease,
 766 };
 767
 768 const struct file_operations cifs_dir_ops = {
 769         .readdir = cifs_readdir,
 770         .release = cifs_closedir,
 771         .read    = generic_read_dir,
 772         .unlocked_ioctl  = cifs_ioctl,
 773         .llseek = generic_file_llseek,
 774 };
 775
 776 static void
 777 cifs_init_once(void *inode)
 778 {
 779         struct cifsInodeInfo *cifsi = inode;
 780
 781         inode_init_once(&cifsi->vfs_inode);
 782         INIT_LIST_HEAD(&cifsi->lockList);
 783 }
 784
 785 static int
 786 cifs_init_inodecache(void)
 787 {
 788         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
 789                                               sizeof(struct cifsInodeInfo),
 790                                               0, (SLAB_RECLAIM_ACCOUNT|
 791                                                 SLAB_MEM_SPREAD),
 792                                               cifs_init_once);
 793         if (cifs_inode_cachep == NULL)
 794                 return -ENOMEM;
 795
 796         return 0;
 797 }
 798
 799 static void
 800 cifs_destroy_inodecache(void)
 801 {
 802         kmem_cache_destroy(cifs_inode_cachep);
 803 }
 804
 805 static int
 806 cifs_init_request_bufs(void)
 807 {
 808         if (CIFSMaxBufSize < 8192) {
 809         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
 810         Unicode path name has to fit in any SMB/CIFS path based frames */
 811                 CIFSMaxBufSize = 8192;
 812         } else if (CIFSMaxBufSize > 1024*127) {
 813                 CIFSMaxBufSize = 1024 * 127;
 814         } else {
 815                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
 816         }
 817 /*      cERROR(1, "CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize); */
 818         cifs_req_cachep = kmem_cache_create("cifs_request",
 819                                             CIFSMaxBufSize +
 820                                             MAX_CIFS_HDR_SIZE, 0,
 821                                             SLAB_HWCACHE_ALIGN, NULL);
 822         if (cifs_req_cachep == NULL)
 823                 return -ENOMEM;
 824
 825         if (cifs_min_rcv < 1)
 826                 cifs_min_rcv = 1;
 827         else if (cifs_min_rcv > 64) {
 828                 cifs_min_rcv = 64;
 829                 cERROR(1, "cifs_min_rcv set to maximum (64)");
 830         }
 831
 832         cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
 833                                                   cifs_req_cachep);
 834
 835         if (cifs_req_poolp == NULL) {
 836                 kmem_cache_destroy(cifs_req_cachep);
 837                 return -ENOMEM;
 838         }
 839         /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
 840         almost all handle based requests (but not write response, nor is it
 841         sufficient for path based requests).  A smaller size would have
 842         been more efficient (compacting multiple slab items on one 4k page)
 843         for the case in which debug was on, but this larger size allows
 844         more SMBs to use small buffer alloc and is still much more
 845         efficient to alloc 1 per page off the slab compared to 17K (5page)
 846         alloc of large cifs buffers even when page debugging is on */
 847         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
 848                         MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
 849                         NULL);
 850         if (cifs_sm_req_cachep == NULL) {
 851                 mempool_destroy(cifs_req_poolp);
 852                 kmem_cache_destroy(cifs_req_cachep);
 853                 return -ENOMEM;
 854         }
 855
 856         if (cifs_min_small < 2)
 857                 cifs_min_small = 2;
 858         else if (cifs_min_small > 256) {
 859                 cifs_min_small = 256;
 860                 cFYI(1, "cifs_min_small set to maximum (256)");
 861         }
 862
 863         cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
 864                                                      cifs_sm_req_cachep);
 865
 866         if (cifs_sm_req_poolp == NULL) {
 867                 mempool_destroy(cifs_req_poolp);
 868                 kmem_cache_destroy(cifs_req_cachep);
 869                 kmem_cache_destroy(cifs_sm_req_cachep);
 870                 return -ENOMEM;
 871         }
 872
 873         return 0;
 874 }
 875
 876 static void
 877 cifs_destroy_request_bufs(void)
 878 {
 879         mempool_destroy(cifs_req_poolp);
 880         kmem_cache_destroy(cifs_req_cachep);
 881         mempool_destroy(cifs_sm_req_poolp);
 882         kmem_cache_destroy(cifs_sm_req_cachep);
 883 }
 884
 885 static int
 886 cifs_init_mids(void)
 887 {
 888         cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
 889                                             sizeof(struct mid_q_entry), 0,
 890                                             SLAB_HWCACHE_ALIGN, NULL);
 891         if (cifs_mid_cachep == NULL)
 892                 return -ENOMEM;
 893
 894         /* 3 is a reasonable minimum number of simultaneous operations */
 895         cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
 896         if (cifs_mid_poolp == NULL) {
 897                 kmem_cache_destroy(cifs_mid_cachep);
 898                 return -ENOMEM;
 899         }
 900
 901         return 0;
 902 }
 903
 904 static void
 905 cifs_destroy_mids(void)
 906 {
 907         mempool_destroy(cifs_mid_poolp);
 908         kmem_cache_destroy(cifs_mid_cachep);
 909 }
 910
 911 static int __init
 912 init_cifs(void)
 913 {
 914         int rc = 0;
 915         cifs_proc_init();
 916         INIT_LIST_HEAD(&cifs_tcp_ses_list);
 917 #ifdef CONFIG_CIFS_EXPERIMENTAL
 918         INIT_LIST_HEAD(&GlobalDnotifyReqList);
 919         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
 920 #endif
 921 /*
 922  *  Initialize Global counters
 923  */
 924         atomic_set(&sesInfoAllocCount, 0);
 925         atomic_set(&tconInfoAllocCount, 0);
 926         atomic_set(&tcpSesAllocCount, 0);
 927         atomic_set(&tcpSesReconnectCount, 0);
 928         atomic_set(&tconInfoReconnectCount, 0);
 929
 930         atomic_set(&bufAllocCount, 0);
 931         atomic_set(&smBufAllocCount, 0);
 932 #ifdef CONFIG_CIFS_STATS2
 933         atomic_set(&totBufAllocCount, 0);
 934         atomic_set(&totSmBufAllocCount, 0);
 935 #endif /* CONFIG_CIFS_STATS2 */
 936
 937         atomic_set(&midCount, 0);
 938         GlobalCurrentXid = 0;
 939         GlobalTotalActiveXid = 0;
 940         GlobalMaxActiveXid = 0;
 941         spin_lock_init(&cifs_tcp_ses_lock);
 942         spin_lock_init(&cifs_file_list_lock);
 943         spin_lock_init(&GlobalMid_Lock);
 944
 945         if (cifs_max_pending < 2) {
 946                 cifs_max_pending = 2;
 947                 cFYI(1, "cifs_max_pending set to min of 2");
 948         } else if (cifs_max_pending > 256) {
 949                 cifs_max_pending = 256;
 950                 cFYI(1, "cifs_max_pending set to max of 256");
 951         }
 952
 953         rc = cifs_fscache_register();
 954         if (rc)
 955                 goto out_clean_proc;
 956
 957         rc = cifs_init_inodecache();
 958         if (rc)
 959                 goto out_unreg_fscache;
 960
 961         rc = cifs_init_mids();
 962         if (rc)
 963                 goto out_destroy_inodecache;
 964
 965         rc = cifs_init_request_bufs();
 966         if (rc)
 967                 goto out_destroy_mids;
 968
 969         rc = register_filesystem(&cifs_fs_type);
 970         if (rc)
 971                 goto out_destroy_request_bufs;
 972 #ifdef CONFIG_CIFS_UPCALL
 973         rc = register_key_type(&cifs_spnego_key_type);
 974         if (rc)
 975                 goto out_unregister_filesystem;
 976 #endif
 977
 978         return 0;
 979
 980 #ifdef CONFIG_CIFS_UPCALL
 981 out_unregister_filesystem:
 982         unregister_filesystem(&cifs_fs_type);
 983 #endif
 984 out_destroy_request_bufs:
 985         cifs_destroy_request_bufs();
 986 out_destroy_mids:
 987         cifs_destroy_mids();
 988 out_destroy_inodecache:
 989         cifs_destroy_inodecache();
 990 out_unreg_fscache:
 991         cifs_fscache_unregister();
 992 out_clean_proc:
 993         cifs_proc_clean();
 994         return rc;
 995 }
 996
 997 static void __exit
 998 exit_cifs(void)
 999 {
1000         cFYI(DBG2, "exit_cifs");
1001         cifs_proc_clean();
1002         cifs_fscache_unregister();
1003 #ifdef CONFIG_CIFS_DFS_UPCALL
1004         cifs_dfs_release_automount_timer();
1005 #endif
1006 #ifdef CONFIG_CIFS_UPCALL
1007         unregister_key_type(&cifs_spnego_key_type);
1008 #endif
1009         unregister_filesystem(&cifs_fs_type);
1010         cifs_destroy_inodecache();
1011         cifs_destroy_mids();
1012         cifs_destroy_request_bufs();
1013 }
1014
1015 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1016 MODULE_LICENSE("GPL");  /* combination of LGPL + GPL source behaves as GPL */
1017 MODULE_DESCRIPTION
1018     ("VFS to access servers complying with the SNIA CIFS Specification "
1019      "e.g. Samba and Windows");
1020 MODULE_VERSION(CIFS_VERSION);
1021 module_init(init_cifs)
1022 module_exit(exit_cifs)