Pileus Git - ~andy/linux/blob - fs/cifs/cifsfs.c

   1 /*
   2  *   fs/cifs/cifsfs.c
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2002,2004
   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 "cifsfs.h"
  36 #include "cifspdu.h"
  37 #define DECLARE_GLOBALS_HERE
  38 #include "cifsglob.h"
  39 #include "cifsproto.h"
  40 #include "cifs_debug.h"
  41 #include "cifs_fs_sb.h"
  42 #include <linux/mm.h>
  43 #define CIFS_MAGIC_NUMBER 0xFF534D42    /* the first four bytes of SMB PDUs */
  44
  45 #ifdef CONFIG_CIFS_QUOTA
  46 static struct quotactl_ops cifs_quotactl_ops;
  47 #endif
  48
  49 int cifsFYI = 0;
  50 int cifsERROR = 1;
  51 int traceSMB = 0;
  52 unsigned int oplockEnabled = 1;
  53 unsigned int experimEnabled = 0;
  54 unsigned int linuxExtEnabled = 1;
  55 unsigned int lookupCacheEnabled = 1;
  56 unsigned int multiuser_mount = 0;
  57 unsigned int extended_security = 0;
  58 unsigned int ntlmv2_support = 0;
  59 unsigned int sign_CIFS_PDUs = 1;
  60 extern struct task_struct * oplockThread; /* remove sparse warning */
  61 struct task_struct * oplockThread = NULL;
  62 extern struct task_struct * dnotifyThread; /* remove sparse warning */
  63 struct task_struct * dnotifyThread = NULL;
  64 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
  65 module_param(CIFSMaxBufSize, int, 0);
  66 MODULE_PARM_DESC(CIFSMaxBufSize,"Network buffer size (not including header). Default: 16384 Range: 8192 to 130048");
  67 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
  68 module_param(cifs_min_rcv, int, 0);
  69 MODULE_PARM_DESC(cifs_min_rcv,"Network buffers in pool. Default: 4 Range: 1 to 64");
  70 unsigned int cifs_min_small = 30;
  71 module_param(cifs_min_small, int, 0);
  72 MODULE_PARM_DESC(cifs_min_small,"Small network buffers in pool. Default: 30 Range: 2 to 256");
  73 unsigned int cifs_max_pending = CIFS_MAX_REQ;
  74 module_param(cifs_max_pending, int, 0);
  75 MODULE_PARM_DESC(cifs_max_pending,"Simultaneous requests to server. Default: 50 Range: 2 to 256");
  76
  77 static DECLARE_COMPLETION(cifs_oplock_exited);
  78 static DECLARE_COMPLETION(cifs_dnotify_exited);
  79
  80 extern mempool_t *cifs_sm_req_poolp;
  81 extern mempool_t *cifs_req_poolp;
  82 extern mempool_t *cifs_mid_poolp;
  83
  84 extern kmem_cache_t *cifs_oplock_cachep;
  85
  86 static int
  87 cifs_read_super(struct super_block *sb, void *data,
  88                 const char *devname, int silent)
  89 {
  90         struct inode *inode;
  91         struct cifs_sb_info *cifs_sb;
  92         int rc = 0;
  93
  94         sb->s_flags |= MS_NODIRATIME; /* and probably even noatime */
  95         sb->s_fs_info = kmalloc(sizeof(struct cifs_sb_info),GFP_KERNEL);
  96         cifs_sb = CIFS_SB(sb);
  97         if(cifs_sb == NULL)
  98                 return -ENOMEM;
  99         else
 100                 memset(cifs_sb,0,sizeof(struct cifs_sb_info));
 101
 102
 103         rc = cifs_mount(sb, cifs_sb, data, devname);
 104
 105         if (rc) {
 106                 if (!silent)
 107                         cERROR(1,
 108                                ("cifs_mount failed w/return code = %d", rc));
 109                 goto out_mount_failed;
 110         }
 111
 112         sb->s_magic = CIFS_MAGIC_NUMBER;
 113         sb->s_op = &cifs_super_ops;
 114 /*      if(cifs_sb->tcon->ses->server->maxBuf > MAX_CIFS_HDR_SIZE + 512)
 115             sb->s_blocksize = cifs_sb->tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE; */
 116 #ifdef CONFIG_CIFS_QUOTA
 117         sb->s_qcop = &cifs_quotactl_ops;
 118 #endif
 119         sb->s_blocksize = CIFS_MAX_MSGSIZE;
 120         sb->s_blocksize_bits = 14;      /* default 2**14 = CIFS_MAX_MSGSIZE */
 121         inode = iget(sb, ROOT_I);
 122
 123         if (!inode) {
 124                 rc = -ENOMEM;
 125                 goto out_no_root;
 126         }
 127
 128         sb->s_root = d_alloc_root(inode);
 129
 130         if (!sb->s_root) {
 131                 rc = -ENOMEM;
 132                 goto out_no_root;
 133         }
 134
 135         return 0;
 136
 137 out_no_root:
 138         cERROR(1, ("cifs_read_super: get root inode failed"));
 139         if (inode)
 140                 iput(inode);
 141
 142 out_mount_failed:
 143         if(cifs_sb) {
 144                 if(cifs_sb->local_nls)
 145                         unload_nls(cifs_sb->local_nls);
 146                 kfree(cifs_sb);
 147         }
 148         return rc;
 149 }
 150
 151 static void
 152 cifs_put_super(struct super_block *sb)
 153 {
 154         int rc = 0;
 155         struct cifs_sb_info *cifs_sb;
 156
 157         cFYI(1, ("In cifs_put_super"));
 158         cifs_sb = CIFS_SB(sb);
 159         if(cifs_sb == NULL) {
 160                 cFYI(1,("Empty cifs superblock info passed to unmount"));
 161                 return;
 162         }
 163         rc = cifs_umount(sb, cifs_sb);
 164         if (rc) {
 165                 cERROR(1, ("cifs_umount failed with return code %d", rc));
 166         }
 167         unload_nls(cifs_sb->local_nls);
 168         kfree(cifs_sb);
 169         return;
 170 }
 171
 172 static int
 173 cifs_statfs(struct super_block *sb, struct kstatfs *buf)
 174 {
 175         int xid;
 176         int rc = -EOPNOTSUPP;
 177         struct cifs_sb_info *cifs_sb;
 178         struct cifsTconInfo *pTcon;
 179
 180         xid = GetXid();
 181
 182         cifs_sb = CIFS_SB(sb);
 183         pTcon = cifs_sb->tcon;
 184
 185         buf->f_type = CIFS_MAGIC_NUMBER;
 186
 187         /* instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO */
 188         buf->f_namelen = PATH_MAX; /* PATH_MAX may be too long - it would
 189                                       presumably be total path, but note
 190                                       that some servers (includinng Samba 3)
 191                                       have a shorter maximum path */
 192         buf->f_files = 0;       /* undefined */
 193         buf->f_ffree = 0;       /* unlimited */
 194
 195 #ifdef CONFIG_CIFS_EXPERIMENTAL
 196 /* BB we could add a second check for a QFS Unix capability bit */
 197 /* BB FIXME check CIFS_POSIX_EXTENSIONS Unix cap first FIXME BB */
 198     if ((pTcon->ses->capabilities & CAP_UNIX) && (CIFS_POSIX_EXTENSIONS &
 199                         le64_to_cpu(pTcon->fsUnixInfo.Capability)))
 200             rc = CIFSSMBQFSPosixInfo(xid, pTcon, buf);
 201
 202     /* Only need to call the old QFSInfo if failed
 203     on newer one */
 204     if(rc)
 205 #endif /* CIFS_EXPERIMENTAL */
 206         rc = CIFSSMBQFSInfo(xid, pTcon, buf);
 207
 208         /* Old Windows servers do not support level 103, retry with level
 209            one if old server failed the previous call */
 210         if(rc)
 211                 rc = SMBOldQFSInfo(xid, pTcon, buf);
 212         /*
 213            int f_type;
 214            __fsid_t f_fsid;
 215            int f_namelen;  */
 216         /* BB get from info in tcon struct at mount time call to QFSAttrInfo */
 217         FreeXid(xid);
 218         return 0;               /* always return success? what if volume is no
 219                                    longer available? */
 220 }
 221
 222 static int cifs_permission(struct inode * inode, int mask, struct nameidata *nd)
 223 {
 224         struct cifs_sb_info *cifs_sb;
 225
 226         cifs_sb = CIFS_SB(inode->i_sb);
 227
 228         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
 229                 return 0;
 230         } else /* file mode might have been restricted at mount time
 231                 on the client (above and beyond ACL on servers) for
 232                 servers which do not support setting and viewing mode bits,
 233                 so allowing client to check permissions is useful */
 234                 return generic_permission(inode, mask, NULL);
 235 }
 236
 237 static kmem_cache_t *cifs_inode_cachep;
 238 static kmem_cache_t *cifs_req_cachep;
 239 static kmem_cache_t *cifs_mid_cachep;
 240 kmem_cache_t *cifs_oplock_cachep;
 241 static kmem_cache_t *cifs_sm_req_cachep;
 242 mempool_t *cifs_sm_req_poolp;
 243 mempool_t *cifs_req_poolp;
 244 mempool_t *cifs_mid_poolp;
 245
 246 static struct inode *
 247 cifs_alloc_inode(struct super_block *sb)
 248 {
 249         struct cifsInodeInfo *cifs_inode;
 250         cifs_inode = kmem_cache_alloc(cifs_inode_cachep, SLAB_KERNEL);
 251         if (!cifs_inode)
 252                 return NULL;
 253         cifs_inode->cifsAttrs = 0x20;   /* default */
 254         atomic_set(&cifs_inode->inUse, 0);
 255         cifs_inode->time = 0;
 256         /* Until the file is open and we have gotten oplock
 257         info back from the server, can not assume caching of
 258         file data or metadata */
 259         cifs_inode->clientCanCacheRead = FALSE;
 260         cifs_inode->clientCanCacheAll = FALSE;
 261         cifs_inode->vfs_inode.i_blksize = CIFS_MAX_MSGSIZE;
 262         cifs_inode->vfs_inode.i_blkbits = 14;  /* 2**14 = CIFS_MAX_MSGSIZE */
 263         cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;
 264         INIT_LIST_HEAD(&cifs_inode->openFileList);
 265         return &cifs_inode->vfs_inode;
 266 }
 267
 268 static void
 269 cifs_destroy_inode(struct inode *inode)
 270 {
 271         kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
 272 }
 273
 274 /*
 275  * cifs_show_options() is for displaying mount options in /proc/mounts.
 276  * Not all settable options are displayed but most of the important
 277  * ones are.
 278  */
 279 static int
 280 cifs_show_options(struct seq_file *s, struct vfsmount *m)
 281 {
 282         struct cifs_sb_info *cifs_sb;
 283
 284         cifs_sb = CIFS_SB(m->mnt_sb);
 285
 286         if (cifs_sb) {
 287                 if (cifs_sb->tcon) {
 288                         seq_printf(s, ",unc=%s", cifs_sb->tcon->treeName);
 289                         if (cifs_sb->tcon->ses) {
 290                                 if (cifs_sb->tcon->ses->userName)
 291                                         seq_printf(s, ",username=%s",
 292                                            cifs_sb->tcon->ses->userName);
 293                                 if(cifs_sb->tcon->ses->domainName)
 294                                         seq_printf(s, ",domain=%s",
 295                                            cifs_sb->tcon->ses->domainName);
 296                         }
 297                 }
 298                 seq_printf(s, ",rsize=%d",cifs_sb->rsize);
 299                 seq_printf(s, ",wsize=%d",cifs_sb->wsize);
 300         }
 301         return 0;
 302 }
 303
 304 #ifdef CONFIG_CIFS_QUOTA
 305 int cifs_xquota_set(struct super_block * sb, int quota_type, qid_t qid,
 306                 struct fs_disk_quota * pdquota)
 307 {
 308         int xid;
 309         int rc = 0;
 310         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 311         struct cifsTconInfo *pTcon;
 312
 313         if(cifs_sb)
 314                 pTcon = cifs_sb->tcon;
 315         else
 316                 return -EIO;
 317
 318
 319         xid = GetXid();
 320         if(pTcon) {
 321                 cFYI(1,("set type: 0x%x id: %d",quota_type,qid));
 322         } else {
 323                 return -EIO;
 324         }
 325
 326         FreeXid(xid);
 327         return rc;
 328 }
 329
 330 int cifs_xquota_get(struct super_block * sb, int quota_type, qid_t qid,
 331                 struct fs_disk_quota * pdquota)
 332 {
 333         int xid;
 334         int rc = 0;
 335         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 336         struct cifsTconInfo *pTcon;
 337
 338         if(cifs_sb)
 339                 pTcon = cifs_sb->tcon;
 340         else
 341                 return -EIO;
 342
 343         xid = GetXid();
 344         if(pTcon) {
 345                 cFYI(1,("set type: 0x%x id: %d",quota_type,qid));
 346         } else {
 347                 rc = -EIO;
 348         }
 349
 350         FreeXid(xid);
 351         return rc;
 352 }
 353
 354 int cifs_xstate_set(struct super_block * sb, unsigned int flags, int operation)
 355 {
 356         int xid;
 357         int rc = 0;
 358         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 359         struct cifsTconInfo *pTcon;
 360
 361         if(cifs_sb)
 362                 pTcon = cifs_sb->tcon;
 363         else
 364                 return -EIO;
 365
 366         xid = GetXid();
 367         if(pTcon) {
 368                 cFYI(1,("flags: 0x%x operation: 0x%x",flags,operation));
 369         } else {
 370                 rc = -EIO;
 371         }
 372
 373         FreeXid(xid);
 374         return rc;
 375 }
 376
 377 int cifs_xstate_get(struct super_block * sb, struct fs_quota_stat *qstats)
 378 {
 379         int xid;
 380         int rc = 0;
 381         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 382         struct cifsTconInfo *pTcon;
 383
 384         if(cifs_sb) {
 385                 pTcon = cifs_sb->tcon;
 386         } else {
 387                 return -EIO;
 388         }
 389         xid = GetXid();
 390         if(pTcon) {
 391                 cFYI(1,("pqstats %p",qstats));
 392         } else {
 393                 rc = -EIO;
 394         }
 395
 396         FreeXid(xid);
 397         return rc;
 398 }
 399
 400 static struct quotactl_ops cifs_quotactl_ops = {
 401         .set_xquota     = cifs_xquota_set,
 402         .get_xquota     = cifs_xquota_set,
 403         .set_xstate     = cifs_xstate_set,
 404         .get_xstate     = cifs_xstate_get,
 405 };
 406 #endif
 407
 408 static void cifs_umount_begin(struct super_block * sblock)
 409 {
 410         struct cifs_sb_info *cifs_sb;
 411
 412         cifs_sb = CIFS_SB(sb);
 413         if(cifs_sb == NULL)
 414                 return -EIO;
 415         if(cifs_sb->tcon == NULL)
 416                 return -EIO;
 417         down(&tcon->tconSem);
 418         if (atomic_read(&tcon->useCount) == 1)
 419                 tcon->tidStatus = CifsExiting;
 420         up(&tcon->tconSem);
 421
 422         if((cifs->sb->tcon->ses) && (cifs_sb->tcon->ses->server))
 423         {
 424                 cERROR(1,("wake up tasks now - umount begin not complete"));
 425                 wake_up_all(&server->request_q);
 426         }
 427 /* BB FIXME - finish add checks for tidStatus BB */
 428
 429         return;
 430 }
 431
 432
 433 static int cifs_remount(struct super_block *sb, int *flags, char *data)
 434 {
 435         *flags |= MS_NODIRATIME;
 436         return 0;
 437 }
 438
 439 struct super_operations cifs_super_ops = {
 440         .read_inode = cifs_read_inode,
 441         .put_super = cifs_put_super,
 442         .statfs = cifs_statfs,
 443         .alloc_inode = cifs_alloc_inode,
 444         .destroy_inode = cifs_destroy_inode,
 445 /*      .drop_inode         = generic_delete_inode,
 446         .delete_inode   = cifs_delete_inode,  *//* Do not need the above two functions
 447    unless later we add lazy close of inodes or unless the kernel forgets to call
 448    us with the same number of releases (closes) as opens */
 449         .show_options = cifs_show_options,
 450 /*      .umount_begin   = cifs_umount_begin, */ /* BB finish in the future */
 451         .remount_fs = cifs_remount,
 452 };
 453
 454 static struct super_block *
 455 cifs_get_sb(struct file_system_type *fs_type,
 456             int flags, const char *dev_name, void *data)
 457 {
 458         int rc;
 459         struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);
 460
 461         cFYI(1, ("Devname: %s flags: %d ", dev_name, flags));
 462
 463         if (IS_ERR(sb))
 464                 return sb;
 465
 466         sb->s_flags = flags;
 467
 468         rc = cifs_read_super(sb, data, dev_name, flags & MS_VERBOSE ? 1 : 0);
 469         if (rc) {
 470                 up_write(&sb->s_umount);
 471                 deactivate_super(sb);
 472                 return ERR_PTR(rc);
 473         }
 474         sb->s_flags |= MS_ACTIVE;
 475         return sb;
 476 }
 477
 478 static ssize_t
 479 cifs_read_wrapper(struct file * file, char __user *read_data, size_t read_size,
 480           loff_t * poffset)
 481 {
 482         if(file->f_dentry == NULL)
 483                 return -EIO;
 484         else if(file->f_dentry->d_inode == NULL)
 485                 return -EIO;
 486
 487         cFYI(1,("In read_wrapper size %zd at %lld",read_size,*poffset));
 488
 489         if(CIFS_I(file->f_dentry->d_inode)->clientCanCacheRead) {
 490                 return generic_file_read(file,read_data,read_size,poffset);
 491         } else {
 492                 /* BB do we need to lock inode from here until after invalidate? */
 493 /*              if(file->f_dentry->d_inode->i_mapping) {
 494                         filemap_fdatawrite(file->f_dentry->d_inode->i_mapping);
 495                         filemap_fdatawait(file->f_dentry->d_inode->i_mapping);
 496                 }*/
 497 /*              cifs_revalidate(file->f_dentry);*/ /* BB fixme */
 498
 499                 /* BB we should make timer configurable - perhaps
 500                    by simply calling cifs_revalidate here */
 501                 /* invalidate_remote_inode(file->f_dentry->d_inode);*/
 502                 return generic_file_read(file,read_data,read_size,poffset);
 503         }
 504 }
 505
 506 static ssize_t
 507 cifs_write_wrapper(struct file * file, const char __user *write_data,
 508            size_t write_size, loff_t * poffset)
 509 {
 510         ssize_t written;
 511
 512         if(file->f_dentry == NULL)
 513                 return -EIO;
 514         else if(file->f_dentry->d_inode == NULL)
 515                 return -EIO;
 516
 517         cFYI(1,("In write_wrapper size %zd at %lld",write_size,*poffset));
 518
 519         written = generic_file_write(file,write_data,write_size,poffset);
 520         if(!CIFS_I(file->f_dentry->d_inode)->clientCanCacheAll)  {
 521                 if(file->f_dentry->d_inode->i_mapping) {
 522                         filemap_fdatawrite(file->f_dentry->d_inode->i_mapping);
 523                 }
 524         }
 525         return written;
 526 }
 527
 528
 529 static struct file_system_type cifs_fs_type = {
 530         .owner = THIS_MODULE,
 531         .name = "cifs",
 532         .get_sb = cifs_get_sb,
 533         .kill_sb = kill_anon_super,
 534         /*  .fs_flags */
 535 };
 536 struct inode_operations cifs_dir_inode_ops = {
 537         .create = cifs_create,
 538         .lookup = cifs_lookup,
 539         .getattr = cifs_getattr,
 540         .unlink = cifs_unlink,
 541         .link = cifs_hardlink,
 542         .mkdir = cifs_mkdir,
 543         .rmdir = cifs_rmdir,
 544         .rename = cifs_rename,
 545         .permission = cifs_permission,
 546 /*      revalidate:cifs_revalidate,   */
 547         .setattr = cifs_setattr,
 548         .symlink = cifs_symlink,
 549         .mknod   = cifs_mknod,
 550 #ifdef CONFIG_CIFS_XATTR
 551         .setxattr = cifs_setxattr,
 552         .getxattr = cifs_getxattr,
 553         .listxattr = cifs_listxattr,
 554         .removexattr = cifs_removexattr,
 555 #endif
 556 };
 557
 558 struct inode_operations cifs_file_inode_ops = {
 559 /*      revalidate:cifs_revalidate, */
 560         .setattr = cifs_setattr,
 561         .getattr = cifs_getattr, /* do we need this anymore? */
 562         .rename = cifs_rename,
 563         .permission = cifs_permission,
 564 #ifdef CONFIG_CIFS_XATTR
 565         .setxattr = cifs_setxattr,
 566         .getxattr = cifs_getxattr,
 567         .listxattr = cifs_listxattr,
 568         .removexattr = cifs_removexattr,
 569 #endif
 570 };
 571
 572 struct inode_operations cifs_symlink_inode_ops = {
 573         .readlink = generic_readlink,
 574         .follow_link = cifs_follow_link,
 575         .put_link = cifs_put_link,
 576         .permission = cifs_permission,
 577         /* BB add the following two eventually */
 578         /* revalidate: cifs_revalidate,
 579            setattr:    cifs_notify_change, *//* BB do we need notify change */
 580 #ifdef CONFIG_CIFS_XATTR
 581         .setxattr = cifs_setxattr,
 582         .getxattr = cifs_getxattr,
 583         .listxattr = cifs_listxattr,
 584         .removexattr = cifs_removexattr,
 585 #endif
 586 };
 587
 588 struct file_operations cifs_file_ops = {
 589         .read = cifs_read_wrapper,
 590         .write = cifs_write_wrapper,
 591         .open = cifs_open,
 592         .release = cifs_close,
 593         .lock = cifs_lock,
 594         .fsync = cifs_fsync,
 595         .flush = cifs_flush,
 596         .mmap  = cifs_file_mmap,
 597         .sendfile = generic_file_sendfile,
 598 #ifdef CONFIG_CIFS_POSIX
 599         .ioctl  = cifs_ioctl,
 600 #endif /* CONFIG_CIFS_POSIX */
 601
 602 #ifdef CONFIG_CIFS_EXPERIMENTAL
 603         .readv = generic_file_readv,
 604         .writev = generic_file_writev,
 605         .aio_read = generic_file_aio_read,
 606         .aio_write = generic_file_aio_write,
 607         .dir_notify = cifs_dir_notify,
 608 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 609 };
 610
 611 struct file_operations cifs_file_direct_ops = {
 612         /* no mmap, no aio, no readv -
 613            BB reevaluate whether they can be done with directio, no cache */
 614         .read = cifs_user_read,
 615         .write = cifs_user_write,
 616         .open = cifs_open,
 617         .release = cifs_close,
 618         .lock = cifs_lock,
 619         .fsync = cifs_fsync,
 620         .flush = cifs_flush,
 621         .sendfile = generic_file_sendfile, /* BB removeme BB */
 622 #ifdef CONFIG_CIFS_POSIX
 623         .ioctl  = cifs_ioctl,
 624 #endif /* CONFIG_CIFS_POSIX */
 625
 626 #ifdef CONFIG_CIFS_EXPERIMENTAL
 627         .dir_notify = cifs_dir_notify,
 628 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 629 };
 630
 631 struct file_operations cifs_dir_ops = {
 632         .readdir = cifs_readdir,
 633         .release = cifs_closedir,
 634         .read    = generic_read_dir,
 635 #ifdef CONFIG_CIFS_EXPERIMENTAL
 636         .dir_notify = cifs_dir_notify,
 637 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 638         .ioctl  = cifs_ioctl,
 639 };
 640
 641 static void
 642 cifs_init_once(void *inode, kmem_cache_t * cachep, unsigned long flags)
 643 {
 644         struct cifsInodeInfo *cifsi = inode;
 645
 646         if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
 647             SLAB_CTOR_CONSTRUCTOR) {
 648                 inode_init_once(&cifsi->vfs_inode);
 649                 INIT_LIST_HEAD(&cifsi->lockList);
 650         }
 651 }
 652
 653 static int
 654 cifs_init_inodecache(void)
 655 {
 656         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
 657                                               sizeof (struct cifsInodeInfo),
 658                                               0, SLAB_RECLAIM_ACCOUNT,
 659                                               cifs_init_once, NULL);
 660         if (cifs_inode_cachep == NULL)
 661                 return -ENOMEM;
 662
 663         return 0;
 664 }
 665
 666 static void
 667 cifs_destroy_inodecache(void)
 668 {
 669         if (kmem_cache_destroy(cifs_inode_cachep))
 670                 printk(KERN_WARNING "cifs_inode_cache: error freeing\n");
 671 }
 672
 673 static int
 674 cifs_init_request_bufs(void)
 675 {
 676         if(CIFSMaxBufSize < 8192) {
 677         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
 678         Unicode path name has to fit in any SMB/CIFS path based frames */
 679                 CIFSMaxBufSize = 8192;
 680         } else if (CIFSMaxBufSize > 1024*127) {
 681                 CIFSMaxBufSize = 1024 * 127;
 682         } else {
 683                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
 684         }
 685 /*      cERROR(1,("CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize)); */
 686         cifs_req_cachep = kmem_cache_create("cifs_request",
 687                                             CIFSMaxBufSize +
 688                                             MAX_CIFS_HDR_SIZE, 0,
 689                                             SLAB_HWCACHE_ALIGN, NULL, NULL);
 690         if (cifs_req_cachep == NULL)
 691                 return -ENOMEM;
 692
 693         if(cifs_min_rcv < 1)
 694                 cifs_min_rcv = 1;
 695         else if (cifs_min_rcv > 64) {
 696                 cifs_min_rcv = 64;
 697                 cERROR(1,("cifs_min_rcv set to maximum (64)"));
 698         }
 699
 700         cifs_req_poolp = mempool_create(cifs_min_rcv,
 701                                         mempool_alloc_slab,
 702                                         mempool_free_slab,
 703                                         cifs_req_cachep);
 704
 705         if(cifs_req_poolp == NULL) {
 706                 kmem_cache_destroy(cifs_req_cachep);
 707                 return -ENOMEM;
 708         }
 709         /* 256 (MAX_CIFS_HDR_SIZE bytes is enough for most SMB responses and
 710         almost all handle based requests (but not write response, nor is it
 711         sufficient for path based requests).  A smaller size would have
 712         been more efficient (compacting multiple slab items on one 4k page)
 713         for the case in which debug was on, but this larger size allows
 714         more SMBs to use small buffer alloc and is still much more
 715         efficient to alloc 1 per page off the slab compared to 17K (5page)
 716         alloc of large cifs buffers even when page debugging is on */
 717         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
 718                         MAX_CIFS_HDR_SIZE, 0, SLAB_HWCACHE_ALIGN, NULL, NULL);
 719         if (cifs_sm_req_cachep == NULL) {
 720                 mempool_destroy(cifs_req_poolp);
 721                 kmem_cache_destroy(cifs_req_cachep);
 722                 return -ENOMEM;
 723         }
 724
 725         if(cifs_min_small < 2)
 726                 cifs_min_small = 2;
 727         else if (cifs_min_small > 256) {
 728                 cifs_min_small = 256;
 729                 cFYI(1,("cifs_min_small set to maximum (256)"));
 730         }
 731
 732         cifs_sm_req_poolp = mempool_create(cifs_min_small,
 733                                 mempool_alloc_slab,
 734                                 mempool_free_slab,
 735                                 cifs_sm_req_cachep);
 736
 737         if(cifs_sm_req_poolp == NULL) {
 738                 mempool_destroy(cifs_req_poolp);
 739                 kmem_cache_destroy(cifs_req_cachep);
 740                 kmem_cache_destroy(cifs_sm_req_cachep);
 741                 return -ENOMEM;
 742         }
 743
 744         return 0;
 745 }
 746
 747 static void
 748 cifs_destroy_request_bufs(void)
 749 {
 750         mempool_destroy(cifs_req_poolp);
 751         if (kmem_cache_destroy(cifs_req_cachep))
 752                 printk(KERN_WARNING
 753                        "cifs_destroy_request_cache: error not all structures were freed\n");
 754         mempool_destroy(cifs_sm_req_poolp);
 755         if (kmem_cache_destroy(cifs_sm_req_cachep))
 756                 printk(KERN_WARNING
 757                       "cifs_destroy_request_cache: cifs_small_rq free error\n");
 758 }
 759
 760 static int
 761 cifs_init_mids(void)
 762 {
 763         cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
 764                                 sizeof (struct mid_q_entry), 0,
 765                                 SLAB_HWCACHE_ALIGN, NULL, NULL);
 766         if (cifs_mid_cachep == NULL)
 767                 return -ENOMEM;
 768
 769         cifs_mid_poolp = mempool_create(3 /* a reasonable min simultan opers */,
 770                                         mempool_alloc_slab,
 771                                         mempool_free_slab,
 772                                         cifs_mid_cachep);
 773         if(cifs_mid_poolp == NULL) {
 774                 kmem_cache_destroy(cifs_mid_cachep);
 775                 return -ENOMEM;
 776         }
 777
 778         cifs_oplock_cachep = kmem_cache_create("cifs_oplock_structs",
 779                                 sizeof (struct oplock_q_entry), 0,
 780                                 SLAB_HWCACHE_ALIGN, NULL, NULL);
 781         if (cifs_oplock_cachep == NULL) {
 782                 kmem_cache_destroy(cifs_mid_cachep);
 783                 mempool_destroy(cifs_mid_poolp);
 784                 return -ENOMEM;
 785         }
 786
 787         return 0;
 788 }
 789
 790 static void
 791 cifs_destroy_mids(void)
 792 {
 793         mempool_destroy(cifs_mid_poolp);
 794         if (kmem_cache_destroy(cifs_mid_cachep))
 795                 printk(KERN_WARNING
 796                        "cifs_destroy_mids: error not all structures were freed\n");
 797
 798         if (kmem_cache_destroy(cifs_oplock_cachep))
 799                 printk(KERN_WARNING
 800                        "error not all oplock structures were freed\n");
 801 }
 802
 803 static int cifs_oplock_thread(void * dummyarg)
 804 {
 805         struct oplock_q_entry * oplock_item;
 806         struct cifsTconInfo *pTcon;
 807         struct inode * inode;
 808         __u16  netfid;
 809         int rc;
 810
 811         daemonize("cifsoplockd");
 812         allow_signal(SIGTERM);
 813
 814         oplockThread = current;
 815         do {
 816                 if(try_to_freeze())
 817                         continue;
 818
 819                 spin_lock(&GlobalMid_Lock);
 820                 if(list_empty(&GlobalOplock_Q)) {
 821                         spin_unlock(&GlobalMid_Lock);
 822                         set_current_state(TASK_INTERRUPTIBLE);
 823                         schedule_timeout(39*HZ);
 824                 } else {
 825                         oplock_item = list_entry(GlobalOplock_Q.next,
 826                                 struct oplock_q_entry, qhead);
 827                         if(oplock_item) {
 828                                 cFYI(1,("found oplock item to write out"));
 829                                 pTcon = oplock_item->tcon;
 830                                 inode = oplock_item->pinode;
 831                                 netfid = oplock_item->netfid;
 832                                 spin_unlock(&GlobalMid_Lock);
 833                                 DeleteOplockQEntry(oplock_item);
 834                                 /* can not grab inode sem here since it would
 835                                 deadlock when oplock received on delete
 836                                 since vfs_unlink holds the i_sem across
 837                                 the call */
 838                                 /* down(&inode->i_sem);*/
 839                                 if (S_ISREG(inode->i_mode)) {
 840                                         rc = filemap_fdatawrite(inode->i_mapping);
 841                                         if(CIFS_I(inode)->clientCanCacheRead == 0) {
 842                                                 filemap_fdatawait(inode->i_mapping);
 843                                                 invalidate_remote_inode(inode);
 844                                         }
 845                                 } else
 846                                         rc = 0;
 847                                 /* up(&inode->i_sem);*/
 848                                 if (rc)
 849                                         CIFS_I(inode)->write_behind_rc = rc;
 850                                 cFYI(1,("Oplock flush inode %p rc %d",inode,rc));
 851
 852                                 /* releasing a stale oplock after recent reconnection
 853                                 of smb session using a now incorrect file
 854                                 handle is not a data integrity issue but do
 855                                 not bother sending an oplock release if session
 856                                 to server still is disconnected since oplock
 857                                 already released by the server in that case */
 858                                 if(pTcon->tidStatus != CifsNeedReconnect) {
 859                                     rc = CIFSSMBLock(0, pTcon, netfid,
 860                                             0 /* len */ , 0 /* offset */, 0,
 861                                             0, LOCKING_ANDX_OPLOCK_RELEASE,
 862                                             0 /* wait flag */);
 863                                         cFYI(1,("Oplock release rc = %d ",rc));
 864                                 }
 865                         } else
 866                                 spin_unlock(&GlobalMid_Lock);
 867                         set_current_state(TASK_INTERRUPTIBLE);
 868                         schedule_timeout(1);  /* yield in case q were corrupt */
 869                 }
 870         } while(!signal_pending(current));
 871         oplockThread = NULL;
 872         complete_and_exit (&cifs_oplock_exited, 0);
 873 }
 874
 875 static int cifs_dnotify_thread(void * dummyarg)
 876 {
 877         daemonize("cifsdnotifyd");
 878         allow_signal(SIGTERM);
 879
 880         dnotifyThread = current;
 881         do {
 882                 if(try_to_freeze())
 883                         continue;
 884                 set_current_state(TASK_INTERRUPTIBLE);
 885                 schedule_timeout(39*HZ);
 886         } while(!signal_pending(current));
 887         complete_and_exit (&cifs_dnotify_exited, 0);
 888 }
 889
 890 static int __init
 891 init_cifs(void)
 892 {
 893         int rc = 0;
 894 #ifdef CONFIG_PROC_FS
 895         cifs_proc_init();
 896 #endif
 897         INIT_LIST_HEAD(&GlobalServerList);      /* BB not implemented yet */
 898         INIT_LIST_HEAD(&GlobalSMBSessionList);
 899         INIT_LIST_HEAD(&GlobalTreeConnectionList);
 900         INIT_LIST_HEAD(&GlobalOplock_Q);
 901 /*
 902  *  Initialize Global counters
 903  */
 904         atomic_set(&sesInfoAllocCount, 0);
 905         atomic_set(&tconInfoAllocCount, 0);
 906         atomic_set(&tcpSesAllocCount,0);
 907         atomic_set(&tcpSesReconnectCount, 0);
 908         atomic_set(&tconInfoReconnectCount, 0);
 909
 910         atomic_set(&bufAllocCount, 0);
 911         atomic_set(&midCount, 0);
 912         GlobalCurrentXid = 0;
 913         GlobalTotalActiveXid = 0;
 914         GlobalMaxActiveXid = 0;
 915         rwlock_init(&GlobalSMBSeslock);
 916         spin_lock_init(&GlobalMid_Lock);
 917
 918         if(cifs_max_pending < 2) {
 919                 cifs_max_pending = 2;
 920                 cFYI(1,("cifs_max_pending set to min of 2"));
 921         } else if(cifs_max_pending > 256) {
 922                 cifs_max_pending = 256;
 923                 cFYI(1,("cifs_max_pending set to max of 256"));
 924         }
 925
 926         rc = cifs_init_inodecache();
 927         if (!rc) {
 928                 rc = cifs_init_mids();
 929                 if (!rc) {
 930                         rc = cifs_init_request_bufs();
 931                         if (!rc) {
 932                                 rc = register_filesystem(&cifs_fs_type);
 933                                 if (!rc) {
 934                                         rc = (int)kernel_thread(cifs_oplock_thread, NULL,
 935                                                 CLONE_FS | CLONE_FILES | CLONE_VM);
 936                                         if(rc > 0) {
 937                                                 rc = (int)kernel_thread(cifs_dnotify_thread, NULL,
 938                                                         CLONE_FS | CLONE_FILES | CLONE_VM);
 939                                                 if(rc > 0)
 940                                                         return 0;
 941                                                 else
 942                                                         cERROR(1,("error %d create dnotify thread", rc));
 943                                         } else {
 944                                                 cERROR(1,("error %d create oplock thread",rc));
 945                                         }
 946                                 }
 947                                 cifs_destroy_request_bufs();
 948                         }
 949                         cifs_destroy_mids();
 950                 }
 951                 cifs_destroy_inodecache();
 952         }
 953 #ifdef CONFIG_PROC_FS
 954         cifs_proc_clean();
 955 #endif
 956         return rc;
 957 }
 958
 959 static void __exit
 960 exit_cifs(void)
 961 {
 962         cFYI(0, ("In unregister ie exit_cifs"));
 963 #ifdef CONFIG_PROC_FS
 964         cifs_proc_clean();
 965 #endif
 966         unregister_filesystem(&cifs_fs_type);
 967         cifs_destroy_inodecache();
 968         cifs_destroy_mids();
 969         cifs_destroy_request_bufs();
 970         if(oplockThread) {
 971                 send_sig(SIGTERM, oplockThread, 1);
 972                 wait_for_completion(&cifs_oplock_exited);
 973         }
 974         if(dnotifyThread) {
 975                 send_sig(SIGTERM, dnotifyThread, 1);
 976                 wait_for_completion(&cifs_dnotify_exited);
 977         }
 978 }
 979
 980 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
 981 MODULE_LICENSE("GPL");          /* combination of LGPL + GPL source behaves as GPL */
 982 MODULE_DESCRIPTION
 983     ("VFS to access servers complying with the SNIA CIFS Specification e.g. Samba and Windows");
 984 MODULE_VERSION(CIFS_VERSION);
 985 module_init(init_cifs)
 986 module_exit(exit_cifs)