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 <linux/smp_lock.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 "dns_resolve.h"
  49 #include "cifs_spnego.h"
  50 #define CIFS_MAGIC_NUMBER 0xFF534D42    /* the first four bytes of SMB PDUs */
  51
  52 #ifdef CONFIG_CIFS_QUOTA
  53 static struct quotactl_ops cifs_quotactl_ops;
  54 #endif /* QUOTA */
  55
  56 int cifsFYI = 0;
  57 int cifsERROR = 1;
  58 int traceSMB = 0;
  59 unsigned int oplockEnabled = 1;
  60 unsigned int experimEnabled = 0;
  61 unsigned int linuxExtEnabled = 1;
  62 unsigned int lookupCacheEnabled = 1;
  63 unsigned int multiuser_mount = 0;
  64 unsigned int extended_security = CIFSSEC_DEF;
  65 /* unsigned int ntlmv2_support = 0; */
  66 unsigned int sign_CIFS_PDUs = 1;
  67 extern struct task_struct *oplockThread; /* remove sparse warning */
  68 struct task_struct *oplockThread = NULL;
  69 /* extern struct task_struct * dnotifyThread; remove sparse warning */
  70 static const struct super_operations cifs_super_ops;
  71 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
  72 module_param(CIFSMaxBufSize, int, 0);
  73 MODULE_PARM_DESC(CIFSMaxBufSize, "Network buffer size (not including header). "
  74                                  "Default: 16384 Range: 8192 to 130048");
  75 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
  76 module_param(cifs_min_rcv, int, 0);
  77 MODULE_PARM_DESC(cifs_min_rcv, "Network buffers in pool. Default: 4 Range: "
  78                                 "1 to 64");
  79 unsigned int cifs_min_small = 30;
  80 module_param(cifs_min_small, int, 0);
  81 MODULE_PARM_DESC(cifs_min_small, "Small network buffers in pool. Default: 30 "
  82                                  "Range: 2 to 256");
  83 unsigned int cifs_max_pending = CIFS_MAX_REQ;
  84 module_param(cifs_max_pending, int, 0);
  85 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server. "
  86                                    "Default: 50 Range: 2 to 256");
  87
  88 extern mempool_t *cifs_sm_req_poolp;
  89 extern mempool_t *cifs_req_poolp;
  90 extern mempool_t *cifs_mid_poolp;
  91
  92 extern struct kmem_cache *cifs_oplock_cachep;
  93
  94 static int
  95 cifs_read_super(struct super_block *sb, void *data,
  96                 const char *devname, int silent)
  97 {
  98         struct inode *inode;
  99         struct cifs_sb_info *cifs_sb;
 100         int rc = 0;
 101
 102         /* BB should we make this contingent on mount parm? */
 103         sb->s_flags |= MS_NODIRATIME | MS_NOATIME;
 104         sb->s_fs_info = kzalloc(sizeof(struct cifs_sb_info), GFP_KERNEL);
 105         cifs_sb = CIFS_SB(sb);
 106         if (cifs_sb == NULL)
 107                 return -ENOMEM;
 108
 109 #ifdef CONFIG_CIFS_DFS_UPCALL
 110         /* copy mount params to sb for use in submounts */
 111         /* BB: should we move this after the mount so we
 112          * do not have to do the copy on failed mounts?
 113          * BB: May be it is better to do simple copy before
 114          * complex operation (mount), and in case of fail
 115          * just exit instead of doing mount and attempting
 116          * undo it if this copy fails?*/
 117         if (data) {
 118                 int len = strlen(data);
 119                 cifs_sb->mountdata = kzalloc(len + 1, GFP_KERNEL);
 120                 if (cifs_sb->mountdata == NULL) {
 121                         kfree(sb->s_fs_info);
 122                         sb->s_fs_info = NULL;
 123                         return -ENOMEM;
 124                 }
 125                 strncpy(cifs_sb->mountdata, data, len + 1);
 126                 cifs_sb->mountdata[len] = '\0';
 127         }
 128 #endif
 129
 130         rc = cifs_mount(sb, cifs_sb, data, devname);
 131
 132         if (rc) {
 133                 if (!silent)
 134                         cERROR(1,
 135                                ("cifs_mount failed w/return code = %d", rc));
 136                 goto out_mount_failed;
 137         }
 138
 139         sb->s_magic = CIFS_MAGIC_NUMBER;
 140         sb->s_op = &cifs_super_ops;
 141 /*      if (cifs_sb->tcon->ses->server->maxBuf > MAX_CIFS_HDR_SIZE + 512)
 142             sb->s_blocksize =
 143                 cifs_sb->tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE; */
 144 #ifdef CONFIG_CIFS_QUOTA
 145         sb->s_qcop = &cifs_quotactl_ops;
 146 #endif
 147         sb->s_blocksize = CIFS_MAX_MSGSIZE;
 148         sb->s_blocksize_bits = 14;      /* default 2**14 = CIFS_MAX_MSGSIZE */
 149         inode = cifs_root_iget(sb, ROOT_I);
 150
 151         if (IS_ERR(inode)) {
 152                 rc = PTR_ERR(inode);
 153                 inode = NULL;
 154                 goto out_no_root;
 155         }
 156
 157         sb->s_root = d_alloc_root(inode);
 158
 159         if (!sb->s_root) {
 160                 rc = -ENOMEM;
 161                 goto out_no_root;
 162         }
 163
 164 #ifdef CONFIG_CIFS_EXPERIMENTAL
 165         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM) {
 166                 cFYI(1, ("export ops supported"));
 167                 sb->s_export_op = &cifs_export_ops;
 168         }
 169 #endif /* EXPERIMENTAL */
 170
 171         return 0;
 172
 173 out_no_root:
 174         cERROR(1, ("cifs_read_super: get root inode failed"));
 175         if (inode)
 176                 iput(inode);
 177
 178         cifs_umount(sb, cifs_sb);
 179
 180 out_mount_failed:
 181         if (cifs_sb) {
 182 #ifdef CONFIG_CIFS_DFS_UPCALL
 183                 if (cifs_sb->mountdata) {
 184                         kfree(cifs_sb->mountdata);
 185                         cifs_sb->mountdata = NULL;
 186                 }
 187 #endif
 188                 if (cifs_sb->local_nls)
 189                         unload_nls(cifs_sb->local_nls);
 190                 kfree(cifs_sb);
 191         }
 192         return rc;
 193 }
 194
 195 static void
 196 cifs_put_super(struct super_block *sb)
 197 {
 198         int rc = 0;
 199         struct cifs_sb_info *cifs_sb;
 200
 201         cFYI(1, ("In cifs_put_super"));
 202         cifs_sb = CIFS_SB(sb);
 203         if (cifs_sb == NULL) {
 204                 cFYI(1, ("Empty cifs superblock info passed to unmount"));
 205                 return;
 206         }
 207
 208         lock_kernel();
 209
 210         rc = cifs_umount(sb, cifs_sb);
 211         if (rc)
 212                 cERROR(1, ("cifs_umount failed with return code %d", rc));
 213 #ifdef CONFIG_CIFS_DFS_UPCALL
 214         if (cifs_sb->mountdata) {
 215                 kfree(cifs_sb->mountdata);
 216                 cifs_sb->mountdata = NULL;
 217         }
 218 #endif
 219
 220         unload_nls(cifs_sb->local_nls);
 221         kfree(cifs_sb);
 222
 223         unlock_kernel();
 224 }
 225
 226 static int
 227 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
 228 {
 229         struct super_block *sb = dentry->d_sb;
 230         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 231         struct cifsTconInfo *tcon = cifs_sb->tcon;
 232         int rc = -EOPNOTSUPP;
 233         int xid;
 234
 235         xid = GetXid();
 236
 237         buf->f_type = CIFS_MAGIC_NUMBER;
 238
 239         /*
 240          * PATH_MAX may be too long - it would presumably be total path,
 241          * but note that some servers (includinng Samba 3) have a shorter
 242          * maximum path.
 243          *
 244          * Instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO.
 245          */
 246         buf->f_namelen = PATH_MAX;
 247         buf->f_files = 0;       /* undefined */
 248         buf->f_ffree = 0;       /* unlimited */
 249
 250         /*
 251          * We could add a second check for a QFS Unix capability bit
 252          */
 253         if ((tcon->ses->capabilities & CAP_UNIX) &&
 254             (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability)))
 255                 rc = CIFSSMBQFSPosixInfo(xid, tcon, buf);
 256
 257         /*
 258          * Only need to call the old QFSInfo if failed on newer one,
 259          * e.g. by OS/2.
 260          **/
 261         if (rc && (tcon->ses->capabilities & CAP_NT_SMBS))
 262                 rc = CIFSSMBQFSInfo(xid, tcon, buf);
 263
 264         /*
 265          * Some old Windows servers also do not support level 103, retry with
 266          * older level one if old server failed the previous call or we
 267          * bypassed it because we detected that this was an older LANMAN sess
 268          */
 269         if (rc)
 270                 rc = SMBOldQFSInfo(xid, tcon, buf);
 271
 272         FreeXid(xid);
 273         return 0;
 274 }
 275
 276 static int cifs_permission(struct inode *inode, int mask)
 277 {
 278         struct cifs_sb_info *cifs_sb;
 279
 280         cifs_sb = CIFS_SB(inode->i_sb);
 281
 282         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
 283                 if ((mask & MAY_EXEC) && !execute_ok(inode))
 284                         return -EACCES;
 285                 else
 286                         return 0;
 287         } else /* file mode might have been restricted at mount time
 288                 on the client (above and beyond ACL on servers) for
 289                 servers which do not support setting and viewing mode bits,
 290                 so allowing client to check permissions is useful */
 291                 return generic_permission(inode, mask, NULL);
 292 }
 293
 294 static struct kmem_cache *cifs_inode_cachep;
 295 static struct kmem_cache *cifs_req_cachep;
 296 static struct kmem_cache *cifs_mid_cachep;
 297 struct kmem_cache *cifs_oplock_cachep;
 298 static struct kmem_cache *cifs_sm_req_cachep;
 299 mempool_t *cifs_sm_req_poolp;
 300 mempool_t *cifs_req_poolp;
 301 mempool_t *cifs_mid_poolp;
 302
 303 static struct inode *
 304 cifs_alloc_inode(struct super_block *sb)
 305 {
 306         struct cifsInodeInfo *cifs_inode;
 307         cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
 308         if (!cifs_inode)
 309                 return NULL;
 310         cifs_inode->cifsAttrs = 0x20;   /* default */
 311         atomic_set(&cifs_inode->inUse, 0);
 312         cifs_inode->time = 0;
 313         cifs_inode->write_behind_rc = 0;
 314         /* Until the file is open and we have gotten oplock
 315         info back from the server, can not assume caching of
 316         file data or metadata */
 317         cifs_inode->clientCanCacheRead = false;
 318         cifs_inode->clientCanCacheAll = false;
 319         cifs_inode->delete_pending = false;
 320         cifs_inode->vfs_inode.i_blkbits = 14;  /* 2**14 = CIFS_MAX_MSGSIZE */
 321         cifs_inode->server_eof = 0;
 322
 323         /* Can not set i_flags here - they get immediately overwritten
 324            to zero by the VFS */
 325 /*      cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;*/
 326         INIT_LIST_HEAD(&cifs_inode->openFileList);
 327         return &cifs_inode->vfs_inode;
 328 }
 329
 330 static void
 331 cifs_destroy_inode(struct inode *inode)
 332 {
 333         kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
 334 }
 335
 336 /*
 337  * cifs_show_options() is for displaying mount options in /proc/mounts.
 338  * Not all settable options are displayed but most of the important
 339  * ones are.
 340  */
 341 static int
 342 cifs_show_options(struct seq_file *s, struct vfsmount *m)
 343 {
 344         struct cifs_sb_info *cifs_sb;
 345         struct cifsTconInfo *tcon;
 346         struct TCP_Server_Info *server;
 347
 348         cifs_sb = CIFS_SB(m->mnt_sb);
 349         tcon = cifs_sb->tcon;
 350
 351         seq_printf(s, ",unc=%s", cifs_sb->tcon->treeName);
 352         if (tcon->ses->userName)
 353                 seq_printf(s, ",username=%s", tcon->ses->userName);
 354         if (tcon->ses->domainName)
 355                 seq_printf(s, ",domain=%s", tcon->ses->domainName);
 356
 357         cifs_show_address(s, tcon->ses->server);
 358
 359         seq_printf(s, ",uid=%d", cifs_sb->mnt_uid);
 360         seq_printf(s, ",gid=%d", cifs_sb->mnt_gid);
 361
 362         server = tcon->ses->server;
 363         seq_printf(s, ",addr=");
 364         switch (server->addr.sockAddr6.sin6_family) {
 365         case AF_INET6:
 366                 seq_printf(s, "%pI6", &server->addr.sockAddr6.sin6_addr);
 367                 break;
 368         case AF_INET:
 369                 seq_printf(s, "%pI4", &server->addr.sockAddr.sin_addr.s_addr);
 370                 break;
 371         }
 372
 373         if (!tcon->unix_ext)
 374                 seq_printf(s, ",file_mode=0%o,dir_mode=0%o",
 375                                            cifs_sb->mnt_file_mode,
 376                                            cifs_sb->mnt_dir_mode);
 377         if (tcon->seal)
 378                 seq_printf(s, ",seal");
 379         if (tcon->nocase)
 380                 seq_printf(s, ",nocase");
 381         if (tcon->retry)
 382                 seq_printf(s, ",hard");
 383         if (cifs_sb->prepath)
 384                 seq_printf(s, ",prepath=%s", cifs_sb->prepath);
 385         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_POSIX_PATHS)
 386                 seq_printf(s, ",posixpaths");
 387         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID)
 388                 seq_printf(s, ",setuids");
 389         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SERVER_INUM)
 390                 seq_printf(s, ",serverino");
 391         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO)
 392                 seq_printf(s, ",directio");
 393         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
 394                 seq_printf(s, ",nouser_xattr");
 395         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR)
 396                 seq_printf(s, ",mapchars");
 397         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)
 398                 seq_printf(s, ",sfu");
 399         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL)
 400                 seq_printf(s, ",nobrl");
 401         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL)
 402                 seq_printf(s, ",cifsacl");
 403         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DYNPERM)
 404                 seq_printf(s, ",dynperm");
 405         if (m->mnt_sb->s_flags & MS_POSIXACL)
 406                 seq_printf(s, ",acl");
 407
 408         seq_printf(s, ",rsize=%d", cifs_sb->rsize);
 409         seq_printf(s, ",wsize=%d", cifs_sb->wsize);
 410
 411         return 0;
 412 }
 413
 414 #ifdef CONFIG_CIFS_QUOTA
 415 int cifs_xquota_set(struct super_block *sb, int quota_type, qid_t qid,
 416                 struct fs_disk_quota *pdquota)
 417 {
 418         int xid;
 419         int rc = 0;
 420         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 421         struct cifsTconInfo *pTcon;
 422
 423         if (cifs_sb)
 424                 pTcon = cifs_sb->tcon;
 425         else
 426                 return -EIO;
 427
 428
 429         xid = GetXid();
 430         if (pTcon) {
 431                 cFYI(1, ("set type: 0x%x id: %d", quota_type, qid));
 432         } else
 433                 rc = -EIO;
 434
 435         FreeXid(xid);
 436         return rc;
 437 }
 438
 439 int cifs_xquota_get(struct super_block *sb, int quota_type, qid_t qid,
 440                     struct fs_disk_quota *pdquota)
 441 {
 442         int xid;
 443         int rc = 0;
 444         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 445         struct cifsTconInfo *pTcon;
 446
 447         if (cifs_sb)
 448                 pTcon = cifs_sb->tcon;
 449         else
 450                 return -EIO;
 451
 452         xid = GetXid();
 453         if (pTcon) {
 454                 cFYI(1, ("set type: 0x%x id: %d", quota_type, qid));
 455         } else
 456                 rc = -EIO;
 457
 458         FreeXid(xid);
 459         return rc;
 460 }
 461
 462 int cifs_xstate_set(struct super_block *sb, unsigned int flags, int operation)
 463 {
 464         int xid;
 465         int rc = 0;
 466         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 467         struct cifsTconInfo *pTcon;
 468
 469         if (cifs_sb)
 470                 pTcon = cifs_sb->tcon;
 471         else
 472                 return -EIO;
 473
 474         xid = GetXid();
 475         if (pTcon) {
 476                 cFYI(1, ("flags: 0x%x operation: 0x%x", flags, operation));
 477         } else
 478                 rc = -EIO;
 479
 480         FreeXid(xid);
 481         return rc;
 482 }
 483
 484 int cifs_xstate_get(struct super_block *sb, struct fs_quota_stat *qstats)
 485 {
 486         int xid;
 487         int rc = 0;
 488         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 489         struct cifsTconInfo *pTcon;
 490
 491         if (cifs_sb)
 492                 pTcon = cifs_sb->tcon;
 493         else
 494                 return -EIO;
 495
 496         xid = GetXid();
 497         if (pTcon) {
 498                 cFYI(1, ("pqstats %p", qstats));
 499         } else
 500                 rc = -EIO;
 501
 502         FreeXid(xid);
 503         return rc;
 504 }
 505
 506 static struct quotactl_ops cifs_quotactl_ops = {
 507         .set_xquota     = cifs_xquota_set,
 508         .get_xquota     = cifs_xquota_get,
 509         .set_xstate     = cifs_xstate_set,
 510         .get_xstate     = cifs_xstate_get,
 511 };
 512 #endif
 513
 514 static void cifs_umount_begin(struct super_block *sb)
 515 {
 516         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 517         struct cifsTconInfo *tcon;
 518
 519         if (cifs_sb == NULL)
 520                 return;
 521
 522         tcon = cifs_sb->tcon;
 523         if (tcon == NULL)
 524                 return;
 525
 526         lock_kernel();
 527         read_lock(&cifs_tcp_ses_lock);
 528         if (tcon->tc_count == 1)
 529                 tcon->tidStatus = CifsExiting;
 530         read_unlock(&cifs_tcp_ses_lock);
 531
 532         /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
 533         /* cancel_notify_requests(tcon); */
 534         if (tcon->ses && tcon->ses->server) {
 535                 cFYI(1, ("wake up tasks now - umount begin not complete"));
 536                 wake_up_all(&tcon->ses->server->request_q);
 537                 wake_up_all(&tcon->ses->server->response_q);
 538                 msleep(1); /* yield */
 539                 /* we have to kick the requests once more */
 540                 wake_up_all(&tcon->ses->server->response_q);
 541                 msleep(1);
 542         }
 543 /* BB FIXME - finish add checks for tidStatus BB */
 544
 545         unlock_kernel();
 546         return;
 547 }
 548
 549 #ifdef CONFIG_CIFS_STATS2
 550 static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt)
 551 {
 552         /* BB FIXME */
 553         return 0;
 554 }
 555 #endif
 556
 557 static int cifs_remount(struct super_block *sb, int *flags, char *data)
 558 {
 559         *flags |= MS_NODIRATIME;
 560         return 0;
 561 }
 562
 563 static const struct super_operations cifs_super_ops = {
 564         .put_super = cifs_put_super,
 565         .statfs = cifs_statfs,
 566         .alloc_inode = cifs_alloc_inode,
 567         .destroy_inode = cifs_destroy_inode,
 568 /*      .drop_inode         = generic_delete_inode,
 569         .delete_inode   = cifs_delete_inode,  */  /* Do not need above two
 570         functions unless later we add lazy close of inodes or unless the
 571         kernel forgets to call us with the same number of releases (closes)
 572         as opens */
 573         .show_options = cifs_show_options,
 574         .umount_begin   = cifs_umount_begin,
 575         .remount_fs = cifs_remount,
 576 #ifdef CONFIG_CIFS_STATS2
 577         .show_stats = cifs_show_stats,
 578 #endif
 579 };
 580
 581 static int
 582 cifs_get_sb(struct file_system_type *fs_type,
 583             int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 584 {
 585         int rc;
 586         struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);
 587
 588         cFYI(1, ("Devname: %s flags: %d ", dev_name, flags));
 589
 590         if (IS_ERR(sb))
 591                 return PTR_ERR(sb);
 592
 593         sb->s_flags = flags;
 594
 595         rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
 596         if (rc) {
 597                 deactivate_locked_super(sb);
 598                 return rc;
 599         }
 600         sb->s_flags |= MS_ACTIVE;
 601         simple_set_mnt(mnt, sb);
 602         return 0;
 603 }
 604
 605 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 606                                    unsigned long nr_segs, loff_t pos)
 607 {
 608         struct inode *inode = iocb->ki_filp->f_path.dentry->d_inode;
 609         ssize_t written;
 610
 611         written = generic_file_aio_write(iocb, iov, nr_segs, pos);
 612         if (!CIFS_I(inode)->clientCanCacheAll)
 613                 filemap_fdatawrite(inode->i_mapping);
 614         return written;
 615 }
 616
 617 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
 618 {
 619         /* origin == SEEK_END => we must revalidate the cached file length */
 620         if (origin == SEEK_END) {
 621                 int retval;
 622
 623                 /* some applications poll for the file length in this strange
 624                    way so we must seek to end on non-oplocked files by
 625                    setting the revalidate time to zero */
 626                 CIFS_I(file->f_path.dentry->d_inode)->time = 0;
 627
 628                 retval = cifs_revalidate(file->f_path.dentry);
 629                 if (retval < 0)
 630                         return (loff_t)retval;
 631         }
 632         return generic_file_llseek_unlocked(file, offset, origin);
 633 }
 634
 635 #ifdef CONFIG_CIFS_EXPERIMENTAL
 636 static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
 637 {
 638         /* note that this is called by vfs setlease with the BKL held
 639            although I doubt that BKL is needed here in cifs */
 640         struct inode *inode = file->f_path.dentry->d_inode;
 641
 642         if (!(S_ISREG(inode->i_mode)))
 643                 return -EINVAL;
 644
 645         /* check if file is oplocked */
 646         if (((arg == F_RDLCK) &&
 647                 (CIFS_I(inode)->clientCanCacheRead)) ||
 648             ((arg == F_WRLCK) &&
 649                 (CIFS_I(inode)->clientCanCacheAll)))
 650                 return generic_setlease(file, arg, lease);
 651         else if (CIFS_SB(inode->i_sb)->tcon->local_lease &&
 652                         !CIFS_I(inode)->clientCanCacheRead)
 653                 /* If the server claims to support oplock on this
 654                    file, then we still need to check oplock even
 655                    if the local_lease mount option is set, but there
 656                    are servers which do not support oplock for which
 657                    this mount option may be useful if the user
 658                    knows that the file won't be changed on the server
 659                    by anyone else */
 660                 return generic_setlease(file, arg, lease);
 661         else
 662                 return -EAGAIN;
 663 }
 664 #endif
 665
 666 struct file_system_type cifs_fs_type = {
 667         .owner = THIS_MODULE,
 668         .name = "cifs",
 669         .get_sb = cifs_get_sb,
 670         .kill_sb = kill_anon_super,
 671         /*  .fs_flags */
 672 };
 673 const struct inode_operations cifs_dir_inode_ops = {
 674         .create = cifs_create,
 675         .lookup = cifs_lookup,
 676         .getattr = cifs_getattr,
 677         .unlink = cifs_unlink,
 678         .link = cifs_hardlink,
 679         .mkdir = cifs_mkdir,
 680         .rmdir = cifs_rmdir,
 681         .rename = cifs_rename,
 682         .permission = cifs_permission,
 683 /*      revalidate:cifs_revalidate,   */
 684         .setattr = cifs_setattr,
 685         .symlink = cifs_symlink,
 686         .mknod   = cifs_mknod,
 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 inode_operations cifs_file_inode_ops = {
 696 /*      revalidate:cifs_revalidate, */
 697         .setattr = cifs_setattr,
 698         .getattr = cifs_getattr, /* do we need this anymore? */
 699         .rename = cifs_rename,
 700         .permission = cifs_permission,
 701 #ifdef CONFIG_CIFS_XATTR
 702         .setxattr = cifs_setxattr,
 703         .getxattr = cifs_getxattr,
 704         .listxattr = cifs_listxattr,
 705         .removexattr = cifs_removexattr,
 706 #endif
 707 };
 708
 709 const struct inode_operations cifs_symlink_inode_ops = {
 710         .readlink = generic_readlink,
 711         .follow_link = cifs_follow_link,
 712         .put_link = cifs_put_link,
 713         .permission = cifs_permission,
 714         /* BB add the following two eventually */
 715         /* revalidate: cifs_revalidate,
 716            setattr:    cifs_notify_change, *//* BB do we need notify change */
 717 #ifdef CONFIG_CIFS_XATTR
 718         .setxattr = cifs_setxattr,
 719         .getxattr = cifs_getxattr,
 720         .listxattr = cifs_listxattr,
 721         .removexattr = cifs_removexattr,
 722 #endif
 723 };
 724
 725 const struct file_operations cifs_file_ops = {
 726         .read = do_sync_read,
 727         .write = do_sync_write,
 728         .aio_read = generic_file_aio_read,
 729         .aio_write = cifs_file_aio_write,
 730         .open = cifs_open,
 731         .release = cifs_close,
 732         .lock = cifs_lock,
 733         .fsync = cifs_fsync,
 734         .flush = cifs_flush,
 735         .mmap  = cifs_file_mmap,
 736         .splice_read = generic_file_splice_read,
 737         .llseek = cifs_llseek,
 738 #ifdef CONFIG_CIFS_POSIX
 739         .unlocked_ioctl = cifs_ioctl,
 740 #endif /* CONFIG_CIFS_POSIX */
 741
 742 #ifdef CONFIG_CIFS_EXPERIMENTAL
 743         .setlease = cifs_setlease,
 744 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 745 };
 746
 747 const struct file_operations cifs_file_direct_ops = {
 748         /* no mmap, no aio, no readv -
 749            BB reevaluate whether they can be done with directio, no cache */
 750         .read = cifs_user_read,
 751         .write = cifs_user_write,
 752         .open = cifs_open,
 753         .release = cifs_close,
 754         .lock = cifs_lock,
 755         .fsync = cifs_fsync,
 756         .flush = cifs_flush,
 757         .splice_read = generic_file_splice_read,
 758 #ifdef CONFIG_CIFS_POSIX
 759         .unlocked_ioctl  = cifs_ioctl,
 760 #endif /* CONFIG_CIFS_POSIX */
 761         .llseek = cifs_llseek,
 762 #ifdef CONFIG_CIFS_EXPERIMENTAL
 763         .setlease = cifs_setlease,
 764 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 765 };
 766 const struct file_operations cifs_file_nobrl_ops = {
 767         .read = do_sync_read,
 768         .write = do_sync_write,
 769         .aio_read = generic_file_aio_read,
 770         .aio_write = cifs_file_aio_write,
 771         .open = cifs_open,
 772         .release = cifs_close,
 773         .fsync = cifs_fsync,
 774         .flush = cifs_flush,
 775         .mmap  = cifs_file_mmap,
 776         .splice_read = generic_file_splice_read,
 777         .llseek = cifs_llseek,
 778 #ifdef CONFIG_CIFS_POSIX
 779         .unlocked_ioctl = cifs_ioctl,
 780 #endif /* CONFIG_CIFS_POSIX */
 781
 782 #ifdef CONFIG_CIFS_EXPERIMENTAL
 783         .setlease = cifs_setlease,
 784 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 785 };
 786
 787 const struct file_operations cifs_file_direct_nobrl_ops = {
 788         /* no mmap, no aio, no readv -
 789            BB reevaluate whether they can be done with directio, no cache */
 790         .read = cifs_user_read,
 791         .write = cifs_user_write,
 792         .open = cifs_open,
 793         .release = cifs_close,
 794         .fsync = cifs_fsync,
 795         .flush = cifs_flush,
 796         .splice_read = generic_file_splice_read,
 797 #ifdef CONFIG_CIFS_POSIX
 798         .unlocked_ioctl  = cifs_ioctl,
 799 #endif /* CONFIG_CIFS_POSIX */
 800         .llseek = cifs_llseek,
 801 #ifdef CONFIG_CIFS_EXPERIMENTAL
 802         .setlease = cifs_setlease,
 803 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 804 };
 805
 806 const struct file_operations cifs_dir_ops = {
 807         .readdir = cifs_readdir,
 808         .release = cifs_closedir,
 809         .read    = generic_read_dir,
 810         .unlocked_ioctl  = cifs_ioctl,
 811         .llseek = generic_file_llseek,
 812 };
 813
 814 static void
 815 cifs_init_once(void *inode)
 816 {
 817         struct cifsInodeInfo *cifsi = inode;
 818
 819         inode_init_once(&cifsi->vfs_inode);
 820         INIT_LIST_HEAD(&cifsi->lockList);
 821 }
 822
 823 static int
 824 cifs_init_inodecache(void)
 825 {
 826         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
 827                                               sizeof(struct cifsInodeInfo),
 828                                               0, (SLAB_RECLAIM_ACCOUNT|
 829                                                 SLAB_MEM_SPREAD),
 830                                               cifs_init_once);
 831         if (cifs_inode_cachep == NULL)
 832                 return -ENOMEM;
 833
 834         return 0;
 835 }
 836
 837 static void
 838 cifs_destroy_inodecache(void)
 839 {
 840         kmem_cache_destroy(cifs_inode_cachep);
 841 }
 842
 843 static int
 844 cifs_init_request_bufs(void)
 845 {
 846         if (CIFSMaxBufSize < 8192) {
 847         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
 848         Unicode path name has to fit in any SMB/CIFS path based frames */
 849                 CIFSMaxBufSize = 8192;
 850         } else if (CIFSMaxBufSize > 1024*127) {
 851                 CIFSMaxBufSize = 1024 * 127;
 852         } else {
 853                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
 854         }
 855 /*      cERROR(1,("CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize)); */
 856         cifs_req_cachep = kmem_cache_create("cifs_request",
 857                                             CIFSMaxBufSize +
 858                                             MAX_CIFS_HDR_SIZE, 0,
 859                                             SLAB_HWCACHE_ALIGN, NULL);
 860         if (cifs_req_cachep == NULL)
 861                 return -ENOMEM;
 862
 863         if (cifs_min_rcv < 1)
 864                 cifs_min_rcv = 1;
 865         else if (cifs_min_rcv > 64) {
 866                 cifs_min_rcv = 64;
 867                 cERROR(1, ("cifs_min_rcv set to maximum (64)"));
 868         }
 869
 870         cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
 871                                                   cifs_req_cachep);
 872
 873         if (cifs_req_poolp == NULL) {
 874                 kmem_cache_destroy(cifs_req_cachep);
 875                 return -ENOMEM;
 876         }
 877         /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
 878         almost all handle based requests (but not write response, nor is it
 879         sufficient for path based requests).  A smaller size would have
 880         been more efficient (compacting multiple slab items on one 4k page)
 881         for the case in which debug was on, but this larger size allows
 882         more SMBs to use small buffer alloc and is still much more
 883         efficient to alloc 1 per page off the slab compared to 17K (5page)
 884         alloc of large cifs buffers even when page debugging is on */
 885         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
 886                         MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
 887                         NULL);
 888         if (cifs_sm_req_cachep == NULL) {
 889                 mempool_destroy(cifs_req_poolp);
 890                 kmem_cache_destroy(cifs_req_cachep);
 891                 return -ENOMEM;
 892         }
 893
 894         if (cifs_min_small < 2)
 895                 cifs_min_small = 2;
 896         else if (cifs_min_small > 256) {
 897                 cifs_min_small = 256;
 898                 cFYI(1, ("cifs_min_small set to maximum (256)"));
 899         }
 900
 901         cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
 902                                                      cifs_sm_req_cachep);
 903
 904         if (cifs_sm_req_poolp == NULL) {
 905                 mempool_destroy(cifs_req_poolp);
 906                 kmem_cache_destroy(cifs_req_cachep);
 907                 kmem_cache_destroy(cifs_sm_req_cachep);
 908                 return -ENOMEM;
 909         }
 910
 911         return 0;
 912 }
 913
 914 static void
 915 cifs_destroy_request_bufs(void)
 916 {
 917         mempool_destroy(cifs_req_poolp);
 918         kmem_cache_destroy(cifs_req_cachep);
 919         mempool_destroy(cifs_sm_req_poolp);
 920         kmem_cache_destroy(cifs_sm_req_cachep);
 921 }
 922
 923 static int
 924 cifs_init_mids(void)
 925 {
 926         cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
 927                                             sizeof(struct mid_q_entry), 0,
 928                                             SLAB_HWCACHE_ALIGN, NULL);
 929         if (cifs_mid_cachep == NULL)
 930                 return -ENOMEM;
 931
 932         /* 3 is a reasonable minimum number of simultaneous operations */
 933         cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
 934         if (cifs_mid_poolp == NULL) {
 935                 kmem_cache_destroy(cifs_mid_cachep);
 936                 return -ENOMEM;
 937         }
 938
 939         cifs_oplock_cachep = kmem_cache_create("cifs_oplock_structs",
 940                                         sizeof(struct oplock_q_entry), 0,
 941                                         SLAB_HWCACHE_ALIGN, NULL);
 942         if (cifs_oplock_cachep == NULL) {
 943                 mempool_destroy(cifs_mid_poolp);
 944                 kmem_cache_destroy(cifs_mid_cachep);
 945                 return -ENOMEM;
 946         }
 947
 948         return 0;
 949 }
 950
 951 static void
 952 cifs_destroy_mids(void)
 953 {
 954         mempool_destroy(cifs_mid_poolp);
 955         kmem_cache_destroy(cifs_mid_cachep);
 956         kmem_cache_destroy(cifs_oplock_cachep);
 957 }
 958
 959 static int cifs_oplock_thread(void *dummyarg)
 960 {
 961         struct oplock_q_entry *oplock_item;
 962         struct cifsTconInfo *pTcon;
 963         struct inode *inode;
 964         __u16  netfid;
 965         int rc, waitrc = 0;
 966
 967         set_freezable();
 968         do {
 969                 if (try_to_freeze())
 970                         continue;
 971
 972                 spin_lock(&GlobalMid_Lock);
 973                 if (list_empty(&GlobalOplock_Q)) {
 974                         spin_unlock(&GlobalMid_Lock);
 975                         set_current_state(TASK_INTERRUPTIBLE);
 976                         schedule_timeout(39*HZ);
 977                 } else {
 978                         oplock_item = list_entry(GlobalOplock_Q.next,
 979                                                 struct oplock_q_entry, qhead);
 980                         cFYI(1, ("found oplock item to write out"));
 981                         pTcon = oplock_item->tcon;
 982                         inode = oplock_item->pinode;
 983                         netfid = oplock_item->netfid;
 984                         spin_unlock(&GlobalMid_Lock);
 985                         DeleteOplockQEntry(oplock_item);
 986                         /* can not grab inode sem here since it would
 987                                 deadlock when oplock received on delete
 988                                 since vfs_unlink holds the i_mutex across
 989                                 the call */
 990                         /* mutex_lock(&inode->i_mutex);*/
 991                         if (S_ISREG(inode->i_mode)) {
 992 #ifdef CONFIG_CIFS_EXPERIMENTAL
 993                                 if (CIFS_I(inode)->clientCanCacheAll == 0)
 994                                         break_lease(inode, FMODE_READ);
 995                                 else if (CIFS_I(inode)->clientCanCacheRead == 0)
 996                                         break_lease(inode, FMODE_WRITE);
 997 #endif
 998                                 rc = filemap_fdatawrite(inode->i_mapping);
 999                                 if (CIFS_I(inode)->clientCanCacheRead == 0) {
1000                                         waitrc = filemap_fdatawait(
1001                                                               inode->i_mapping);
1002                                         invalidate_remote_inode(inode);
1003                                 }
1004                                 if (rc == 0)
1005                                         rc = waitrc;
1006                         } else
1007                                 rc = 0;
1008                         /* mutex_unlock(&inode->i_mutex);*/
1009                         if (rc)
1010                                 CIFS_I(inode)->write_behind_rc = rc;
1011                         cFYI(1, ("Oplock flush inode %p rc %d",
1012                                 inode, rc));
1013
1014                                 /* releasing stale oplock after recent reconnect
1015                                 of smb session using a now incorrect file
1016                                 handle is not a data integrity issue but do
1017                                 not bother sending an oplock release if session
1018                                 to server still is disconnected since oplock
1019                                 already released by the server in that case */
1020                         if (!pTcon->need_reconnect) {
1021                                 rc = CIFSSMBLock(0, pTcon, netfid,
1022                                                 0 /* len */ , 0 /* offset */, 0,
1023                                                 0, LOCKING_ANDX_OPLOCK_RELEASE,
1024                                                 false /* wait flag */);
1025                                 cFYI(1, ("Oplock release rc = %d", rc));
1026                         }
1027                         set_current_state(TASK_INTERRUPTIBLE);
1028                         schedule_timeout(1);  /* yield in case q were corrupt */
1029                 }
1030         } while (!kthread_should_stop());
1031
1032         return 0;
1033 }
1034
1035 static int __init
1036 init_cifs(void)
1037 {
1038         int rc = 0;
1039         cifs_proc_init();
1040         INIT_LIST_HEAD(&cifs_tcp_ses_list);
1041         INIT_LIST_HEAD(&GlobalOplock_Q);
1042 #ifdef CONFIG_CIFS_EXPERIMENTAL
1043         INIT_LIST_HEAD(&GlobalDnotifyReqList);
1044         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
1045 #endif
1046 /*
1047  *  Initialize Global counters
1048  */
1049         atomic_set(&sesInfoAllocCount, 0);
1050         atomic_set(&tconInfoAllocCount, 0);
1051         atomic_set(&tcpSesAllocCount, 0);
1052         atomic_set(&tcpSesReconnectCount, 0);
1053         atomic_set(&tconInfoReconnectCount, 0);
1054
1055         atomic_set(&bufAllocCount, 0);
1056         atomic_set(&smBufAllocCount, 0);
1057 #ifdef CONFIG_CIFS_STATS2
1058         atomic_set(&totBufAllocCount, 0);
1059         atomic_set(&totSmBufAllocCount, 0);
1060 #endif /* CONFIG_CIFS_STATS2 */
1061
1062         atomic_set(&midCount, 0);
1063         GlobalCurrentXid = 0;
1064         GlobalTotalActiveXid = 0;
1065         GlobalMaxActiveXid = 0;
1066         memset(Local_System_Name, 0, 15);
1067         rwlock_init(&GlobalSMBSeslock);
1068         rwlock_init(&cifs_tcp_ses_lock);
1069         spin_lock_init(&GlobalMid_Lock);
1070
1071         if (cifs_max_pending < 2) {
1072                 cifs_max_pending = 2;
1073                 cFYI(1, ("cifs_max_pending set to min of 2"));
1074         } else if (cifs_max_pending > 256) {
1075                 cifs_max_pending = 256;
1076                 cFYI(1, ("cifs_max_pending set to max of 256"));
1077         }
1078
1079         rc = cifs_init_inodecache();
1080         if (rc)
1081                 goto out_clean_proc;
1082
1083         rc = cifs_init_mids();
1084         if (rc)
1085                 goto out_destroy_inodecache;
1086
1087         rc = cifs_init_request_bufs();
1088         if (rc)
1089                 goto out_destroy_mids;
1090
1091         rc = register_filesystem(&cifs_fs_type);
1092         if (rc)
1093                 goto out_destroy_request_bufs;
1094 #ifdef CONFIG_CIFS_UPCALL
1095         rc = register_key_type(&cifs_spnego_key_type);
1096         if (rc)
1097                 goto out_unregister_filesystem;
1098 #endif
1099 #ifdef CONFIG_CIFS_DFS_UPCALL
1100         rc = register_key_type(&key_type_dns_resolver);
1101         if (rc)
1102                 goto out_unregister_key_type;
1103 #endif
1104         oplockThread = kthread_run(cifs_oplock_thread, NULL, "cifsoplockd");
1105         if (IS_ERR(oplockThread)) {
1106                 rc = PTR_ERR(oplockThread);
1107                 cERROR(1, ("error %d create oplock thread", rc));
1108                 goto out_unregister_dfs_key_type;
1109         }
1110
1111         return 0;
1112
1113  out_unregister_dfs_key_type:
1114 #ifdef CONFIG_CIFS_DFS_UPCALL
1115         unregister_key_type(&key_type_dns_resolver);
1116  out_unregister_key_type:
1117 #endif
1118 #ifdef CONFIG_CIFS_UPCALL
1119         unregister_key_type(&cifs_spnego_key_type);
1120  out_unregister_filesystem:
1121 #endif
1122         unregister_filesystem(&cifs_fs_type);
1123  out_destroy_request_bufs:
1124         cifs_destroy_request_bufs();
1125  out_destroy_mids:
1126         cifs_destroy_mids();
1127  out_destroy_inodecache:
1128         cifs_destroy_inodecache();
1129  out_clean_proc:
1130         cifs_proc_clean();
1131         return rc;
1132 }
1133
1134 static void __exit
1135 exit_cifs(void)
1136 {
1137         cFYI(DBG2, ("exit_cifs"));
1138         cifs_proc_clean();
1139 #ifdef CONFIG_CIFS_DFS_UPCALL
1140         cifs_dfs_release_automount_timer();
1141         unregister_key_type(&key_type_dns_resolver);
1142 #endif
1143 #ifdef CONFIG_CIFS_UPCALL
1144         unregister_key_type(&cifs_spnego_key_type);
1145 #endif
1146         unregister_filesystem(&cifs_fs_type);
1147         cifs_destroy_inodecache();
1148         cifs_destroy_mids();
1149         cifs_destroy_request_bufs();
1150         kthread_stop(oplockThread);
1151 }
1152
1153 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1154 MODULE_LICENSE("GPL");  /* combination of LGPL + GPL source behaves as GPL */
1155 MODULE_DESCRIPTION
1156     ("VFS to access servers complying with the SNIA CIFS Specification "
1157      "e.g. Samba and Windows");
1158 MODULE_VERSION(CIFS_VERSION);
1159 module_init(init_cifs)
1160 module_exit(exit_cifs)