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 <linux/delay.h>
  36 #include "cifsfs.h"
  37 #include "cifspdu.h"
  38 #define DECLARE_GLOBALS_HERE
  39 #include "cifsglob.h"
  40 #include "cifsproto.h"
  41 #include "cifs_debug.h"
  42 #include "cifs_fs_sb.h"
  43 #include <linux/mm.h>
  44 #define CIFS_MAGIC_NUMBER 0xFF534D42    /* the first four bytes of SMB PDUs */
  45
  46 #ifdef CONFIG_CIFS_QUOTA
  47 static struct quotactl_ops cifs_quotactl_ops;
  48 #endif
  49
  50 int cifsFYI = 0;
  51 int cifsERROR = 1;
  52 int traceSMB = 0;
  53 unsigned int oplockEnabled = 1;
  54 unsigned int experimEnabled = 0;
  55 unsigned int linuxExtEnabled = 1;
  56 unsigned int lookupCacheEnabled = 1;
  57 unsigned int multiuser_mount = 0;
  58 unsigned int extended_security = 0;
  59 unsigned int ntlmv2_support = 0;
  60 unsigned int sign_CIFS_PDUs = 1;
  61 extern struct task_struct * oplockThread; /* remove sparse warning */
  62 struct task_struct * oplockThread = NULL;
  63 extern struct task_struct * dnotifyThread; /* remove sparse warning */
  64 struct task_struct * dnotifyThread = NULL;
  65 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
  66 module_param(CIFSMaxBufSize, int, 0);
  67 MODULE_PARM_DESC(CIFSMaxBufSize,"Network buffer size (not including header). 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: 1 to 64");
  71 unsigned int cifs_min_small = 30;
  72 module_param(cifs_min_small, int, 0);
  73 MODULE_PARM_DESC(cifs_min_small,"Small network buffers in pool. Default: 30 Range: 2 to 256");
  74 unsigned int cifs_max_pending = CIFS_MAX_REQ;
  75 module_param(cifs_max_pending, int, 0);
  76 MODULE_PARM_DESC(cifs_max_pending,"Simultaneous requests to server. Default: 50 Range: 2 to 256");
  77
  78 static DECLARE_COMPLETION(cifs_oplock_exited);
  79 static DECLARE_COMPLETION(cifs_dnotify_exited);
  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 extern kmem_cache_t *cifs_oplock_cachep;
  86
  87 static int
  88 cifs_read_super(struct super_block *sb, void *data,
  89                 const char *devname, int silent)
  90 {
  91         struct inode *inode;
  92         struct cifs_sb_info *cifs_sb;
  93         int rc = 0;
  94
  95         sb->s_flags |= MS_NODIRATIME; /* and probably even noatime */
  96         sb->s_fs_info = kmalloc(sizeof(struct cifs_sb_info),GFP_KERNEL);
  97         cifs_sb = CIFS_SB(sb);
  98         if(cifs_sb == NULL)
  99                 return -ENOMEM;
 100         else
 101                 memset(cifs_sb,0,sizeof(struct cifs_sb_info));
 102
 103
 104         rc = cifs_mount(sb, cifs_sb, data, devname);
 105
 106         if (rc) {
 107                 if (!silent)
 108                         cERROR(1,
 109                                ("cifs_mount failed w/return code = %d", rc));
 110                 goto out_mount_failed;
 111         }
 112
 113         sb->s_magic = CIFS_MAGIC_NUMBER;
 114         sb->s_op = &cifs_super_ops;
 115 /*      if(cifs_sb->tcon->ses->server->maxBuf > MAX_CIFS_HDR_SIZE + 512)
 116             sb->s_blocksize = cifs_sb->tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE; */
 117 #ifdef CONFIG_CIFS_QUOTA
 118         sb->s_qcop = &cifs_quotactl_ops;
 119 #endif
 120         sb->s_blocksize = CIFS_MAX_MSGSIZE;
 121         sb->s_blocksize_bits = 14;      /* default 2**14 = CIFS_MAX_MSGSIZE */
 122         inode = iget(sb, ROOT_I);
 123
 124         if (!inode) {
 125                 rc = -ENOMEM;
 126                 goto out_no_root;
 127         }
 128
 129         sb->s_root = d_alloc_root(inode);
 130
 131         if (!sb->s_root) {
 132                 rc = -ENOMEM;
 133                 goto out_no_root;
 134         }
 135
 136         return 0;
 137
 138 out_no_root:
 139         cERROR(1, ("cifs_read_super: get root inode failed"));
 140         if (inode)
 141                 iput(inode);
 142
 143 out_mount_failed:
 144         if(cifs_sb) {
 145                 if(cifs_sb->local_nls)
 146                         unload_nls(cifs_sb->local_nls);
 147                 kfree(cifs_sb);
 148         }
 149         return rc;
 150 }
 151
 152 static void
 153 cifs_put_super(struct super_block *sb)
 154 {
 155         int rc = 0;
 156         struct cifs_sb_info *cifs_sb;
 157
 158         cFYI(1, ("In cifs_put_super"));
 159         cifs_sb = CIFS_SB(sb);
 160         if(cifs_sb == NULL) {
 161                 cFYI(1,("Empty cifs superblock info passed to unmount"));
 162                 return;
 163         }
 164         rc = cifs_umount(sb, cifs_sb);
 165         if (rc) {
 166                 cERROR(1, ("cifs_umount failed with return code %d", rc));
 167         }
 168         unload_nls(cifs_sb->local_nls);
 169         kfree(cifs_sb);
 170         return;
 171 }
 172
 173 static int
 174 cifs_statfs(struct super_block *sb, struct kstatfs *buf)
 175 {
 176         int xid;
 177         int rc = -EOPNOTSUPP;
 178         struct cifs_sb_info *cifs_sb;
 179         struct cifsTconInfo *pTcon;
 180
 181         xid = GetXid();
 182
 183         cifs_sb = CIFS_SB(sb);
 184         pTcon = cifs_sb->tcon;
 185
 186         buf->f_type = CIFS_MAGIC_NUMBER;
 187
 188         /* instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO */
 189         buf->f_namelen = PATH_MAX; /* PATH_MAX may be too long - it would
 190                                       presumably be total path, but note
 191                                       that some servers (includinng Samba 3)
 192                                       have a shorter maximum path */
 193         buf->f_files = 0;       /* undefined */
 194         buf->f_ffree = 0;       /* unlimited */
 195
 196 #ifdef CONFIG_CIFS_EXPERIMENTAL
 197 /* BB we could add a second check for a QFS Unix capability bit */
 198 /* BB FIXME check CIFS_POSIX_EXTENSIONS Unix cap first FIXME BB */
 199     if ((pTcon->ses->capabilities & CAP_UNIX) && (CIFS_POSIX_EXTENSIONS &
 200                         le64_to_cpu(pTcon->fsUnixInfo.Capability)))
 201             rc = CIFSSMBQFSPosixInfo(xid, pTcon, buf);
 202
 203     /* Only need to call the old QFSInfo if failed
 204     on newer one */
 205     if(rc)
 206 #endif /* CIFS_EXPERIMENTAL */
 207         rc = CIFSSMBQFSInfo(xid, pTcon, buf);
 208
 209         /* Old Windows servers do not support level 103, retry with level
 210            one if old server failed the previous call */
 211         if(rc)
 212                 rc = SMBOldQFSInfo(xid, pTcon, buf);
 213         /*
 214            int f_type;
 215            __fsid_t f_fsid;
 216            int f_namelen;  */
 217         /* BB get from info in tcon struct at mount time call to QFSAttrInfo */
 218         FreeXid(xid);
 219         return 0;               /* always return success? what if volume is no
 220                                    longer available? */
 221 }
 222
 223 static int cifs_permission(struct inode * inode, int mask, struct nameidata *nd)
 224 {
 225         struct cifs_sb_info *cifs_sb;
 226
 227         cifs_sb = CIFS_SB(inode->i_sb);
 228
 229         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
 230                 return 0;
 231         } else /* file mode might have been restricted at mount time
 232                 on the client (above and beyond ACL on servers) for
 233                 servers which do not support setting and viewing mode bits,
 234                 so allowing client to check permissions is useful */
 235                 return generic_permission(inode, mask, NULL);
 236 }
 237
 238 static kmem_cache_t *cifs_inode_cachep;
 239 static kmem_cache_t *cifs_req_cachep;
 240 static kmem_cache_t *cifs_mid_cachep;
 241 kmem_cache_t *cifs_oplock_cachep;
 242 static kmem_cache_t *cifs_sm_req_cachep;
 243 mempool_t *cifs_sm_req_poolp;
 244 mempool_t *cifs_req_poolp;
 245 mempool_t *cifs_mid_poolp;
 246
 247 static struct inode *
 248 cifs_alloc_inode(struct super_block *sb)
 249 {
 250         struct cifsInodeInfo *cifs_inode;
 251         cifs_inode = kmem_cache_alloc(cifs_inode_cachep, SLAB_KERNEL);
 252         if (!cifs_inode)
 253                 return NULL;
 254         cifs_inode->cifsAttrs = 0x20;   /* default */
 255         atomic_set(&cifs_inode->inUse, 0);
 256         cifs_inode->time = 0;
 257         /* Until the file is open and we have gotten oplock
 258         info back from the server, can not assume caching of
 259         file data or metadata */
 260         cifs_inode->clientCanCacheRead = FALSE;
 261         cifs_inode->clientCanCacheAll = FALSE;
 262         cifs_inode->vfs_inode.i_blksize = CIFS_MAX_MSGSIZE;
 263         cifs_inode->vfs_inode.i_blkbits = 14;  /* 2**14 = CIFS_MAX_MSGSIZE */
 264         cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;
 265         INIT_LIST_HEAD(&cifs_inode->openFileList);
 266         return &cifs_inode->vfs_inode;
 267 }
 268
 269 static void
 270 cifs_destroy_inode(struct inode *inode)
 271 {
 272         kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
 273 }
 274
 275 /*
 276  * cifs_show_options() is for displaying mount options in /proc/mounts.
 277  * Not all settable options are displayed but most of the important
 278  * ones are.
 279  */
 280 static int
 281 cifs_show_options(struct seq_file *s, struct vfsmount *m)
 282 {
 283         struct cifs_sb_info *cifs_sb;
 284
 285         cifs_sb = CIFS_SB(m->mnt_sb);
 286
 287         if (cifs_sb) {
 288                 if (cifs_sb->tcon) {
 289                         seq_printf(s, ",unc=%s", cifs_sb->tcon->treeName);
 290                         if (cifs_sb->tcon->ses) {
 291                                 if (cifs_sb->tcon->ses->userName)
 292                                         seq_printf(s, ",username=%s",
 293                                            cifs_sb->tcon->ses->userName);
 294                                 if(cifs_sb->tcon->ses->domainName)
 295                                         seq_printf(s, ",domain=%s",
 296                                            cifs_sb->tcon->ses->domainName);
 297                         }
 298                 }
 299                 seq_printf(s, ",rsize=%d",cifs_sb->rsize);
 300                 seq_printf(s, ",wsize=%d",cifs_sb->wsize);
 301         }
 302         return 0;
 303 }
 304
 305 #ifdef CONFIG_CIFS_QUOTA
 306 int cifs_xquota_set(struct super_block * sb, int quota_type, qid_t qid,
 307                 struct fs_disk_quota * pdquota)
 308 {
 309         int xid;
 310         int rc = 0;
 311         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 312         struct cifsTconInfo *pTcon;
 313
 314         if(cifs_sb)
 315                 pTcon = cifs_sb->tcon;
 316         else
 317                 return -EIO;
 318
 319
 320         xid = GetXid();
 321         if(pTcon) {
 322                 cFYI(1,("set type: 0x%x id: %d",quota_type,qid));
 323         } else {
 324                 return -EIO;
 325         }
 326
 327         FreeXid(xid);
 328         return rc;
 329 }
 330
 331 int cifs_xquota_get(struct super_block * sb, int quota_type, qid_t qid,
 332                 struct fs_disk_quota * pdquota)
 333 {
 334         int xid;
 335         int rc = 0;
 336         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 337         struct cifsTconInfo *pTcon;
 338
 339         if(cifs_sb)
 340                 pTcon = cifs_sb->tcon;
 341         else
 342                 return -EIO;
 343
 344         xid = GetXid();
 345         if(pTcon) {
 346                 cFYI(1,("set type: 0x%x id: %d",quota_type,qid));
 347         } else {
 348                 rc = -EIO;
 349         }
 350
 351         FreeXid(xid);
 352         return rc;
 353 }
 354
 355 int cifs_xstate_set(struct super_block * sb, unsigned int flags, int operation)
 356 {
 357         int xid;
 358         int rc = 0;
 359         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 360         struct cifsTconInfo *pTcon;
 361
 362         if(cifs_sb)
 363                 pTcon = cifs_sb->tcon;
 364         else
 365                 return -EIO;
 366
 367         xid = GetXid();
 368         if(pTcon) {
 369                 cFYI(1,("flags: 0x%x operation: 0x%x",flags,operation));
 370         } else {
 371                 rc = -EIO;
 372         }
 373
 374         FreeXid(xid);
 375         return rc;
 376 }
 377
 378 int cifs_xstate_get(struct super_block * sb, struct fs_quota_stat *qstats)
 379 {
 380         int xid;
 381         int rc = 0;
 382         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 383         struct cifsTconInfo *pTcon;
 384
 385         if(cifs_sb) {
 386                 pTcon = cifs_sb->tcon;
 387         } else {
 388                 return -EIO;
 389         }
 390         xid = GetXid();
 391         if(pTcon) {
 392                 cFYI(1,("pqstats %p",qstats));
 393         } else {
 394                 rc = -EIO;
 395         }
 396
 397         FreeXid(xid);
 398         return rc;
 399 }
 400
 401 static struct quotactl_ops cifs_quotactl_ops = {
 402         .set_xquota     = cifs_xquota_set,
 403         .get_xquota     = cifs_xquota_set,
 404         .set_xstate     = cifs_xstate_set,
 405         .get_xstate     = cifs_xstate_get,
 406 };
 407 #endif
 408
 409 #ifdef CONFIG_CIFS_EXPERIMENTAL
 410 static void cifs_umount_begin(struct super_block * sblock)
 411 {
 412         struct cifs_sb_info *cifs_sb;
 413         struct cifsTconInfo * tcon;
 414
 415         cifs_sb = CIFS_SB(sblock);
 416         if(cifs_sb == NULL)
 417                 return;
 418
 419         tcon = cifs_sb->tcon;
 420         if(tcon == NULL)
 421                 return;
 422         down(&tcon->tconSem);
 423         if (atomic_read(&tcon->useCount) == 1)
 424                 tcon->tidStatus = CifsExiting;
 425         up(&tcon->tconSem);
 426
 427         /* cancel_brl_requests(tcon); */
 428         /* cancel_notify_requests(tcon); */
 429         if(tcon->ses && tcon->ses->server)
 430         {
 431                 cFYI(1,("wake up tasks now - umount begin not complete"));
 432                 wake_up_all(&tcon->ses->server->request_q);
 433                 wake_up_all(&tcon->ses->server->response_q);
 434                 msleep(1); /* yield */
 435                 /* we have to kick the requests once more */
 436                 wake_up_all(&tcon->ses->server->response_q);
 437                 msleep(1);
 438         }
 439 /* BB FIXME - finish add checks for tidStatus BB */
 440
 441         return;
 442 }
 443 #endif
 444
 445 static int cifs_remount(struct super_block *sb, int *flags, char *data)
 446 {
 447         *flags |= MS_NODIRATIME;
 448         return 0;
 449 }
 450
 451 struct super_operations cifs_super_ops = {
 452         .read_inode = cifs_read_inode,
 453         .put_super = cifs_put_super,
 454         .statfs = cifs_statfs,
 455         .alloc_inode = cifs_alloc_inode,
 456         .destroy_inode = cifs_destroy_inode,
 457 /*      .drop_inode         = generic_delete_inode,
 458         .delete_inode   = cifs_delete_inode,  *//* Do not need the above two functions
 459    unless later we add lazy close of inodes or unless the kernel forgets to call
 460    us with the same number of releases (closes) as opens */
 461         .show_options = cifs_show_options,
 462 #ifdef CONFIG_CIFS_EXPERIMENTAL
 463         .umount_begin   = cifs_umount_begin,
 464 #endif
 465         .remount_fs = cifs_remount,
 466 };
 467
 468 static struct super_block *
 469 cifs_get_sb(struct file_system_type *fs_type,
 470             int flags, const char *dev_name, void *data)
 471 {
 472         int rc;
 473         struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);
 474
 475         cFYI(1, ("Devname: %s flags: %d ", dev_name, flags));
 476
 477         if (IS_ERR(sb))
 478                 return sb;
 479
 480         sb->s_flags = flags;
 481
 482         rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
 483         if (rc) {
 484                 up_write(&sb->s_umount);
 485                 deactivate_super(sb);
 486                 return ERR_PTR(rc);
 487         }
 488         sb->s_flags |= MS_ACTIVE;
 489         return sb;
 490 }
 491
 492 static ssize_t cifs_file_writev(struct file *file, const struct iovec *iov,
 493                                 unsigned long nr_segs, loff_t *ppos)
 494 {
 495         struct inode *inode = file->f_dentry->d_inode;
 496         ssize_t written;
 497
 498         written = generic_file_writev(file, iov, nr_segs, ppos);
 499         if (!CIFS_I(inode)->clientCanCacheAll)
 500                 filemap_fdatawrite(inode->i_mapping);
 501         return written;
 502 }
 503
 504 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const char __user *buf,
 505                                    size_t count, loff_t pos)
 506 {
 507         struct inode *inode = iocb->ki_filp->f_dentry->d_inode;
 508         ssize_t written;
 509
 510         written = generic_file_aio_write(iocb, buf, count, pos);
 511         if (!CIFS_I(inode)->clientCanCacheAll)
 512                 filemap_fdatawrite(inode->i_mapping);
 513         return written;
 514 }
 515
 516 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
 517 {
 518         /* origin == SEEK_END => we must revalidate the cached file length */
 519         if (origin == 2) {
 520                 int retval = cifs_revalidate(file->f_dentry);
 521                 if (retval < 0)
 522                         return (loff_t)retval;
 523         }
 524         return remote_llseek(file, offset, origin);
 525 }
 526
 527 static struct file_system_type cifs_fs_type = {
 528         .owner = THIS_MODULE,
 529         .name = "cifs",
 530         .get_sb = cifs_get_sb,
 531         .kill_sb = kill_anon_super,
 532         /*  .fs_flags */
 533 };
 534 struct inode_operations cifs_dir_inode_ops = {
 535         .create = cifs_create,
 536         .lookup = cifs_lookup,
 537         .getattr = cifs_getattr,
 538         .unlink = cifs_unlink,
 539         .link = cifs_hardlink,
 540         .mkdir = cifs_mkdir,
 541         .rmdir = cifs_rmdir,
 542         .rename = cifs_rename,
 543         .permission = cifs_permission,
 544 /*      revalidate:cifs_revalidate,   */
 545         .setattr = cifs_setattr,
 546         .symlink = cifs_symlink,
 547         .mknod   = cifs_mknod,
 548 #ifdef CONFIG_CIFS_XATTR
 549         .setxattr = cifs_setxattr,
 550         .getxattr = cifs_getxattr,
 551         .listxattr = cifs_listxattr,
 552         .removexattr = cifs_removexattr,
 553 #endif
 554 };
 555
 556 struct inode_operations cifs_file_inode_ops = {
 557 /*      revalidate:cifs_revalidate, */
 558         .setattr = cifs_setattr,
 559         .getattr = cifs_getattr, /* do we need this anymore? */
 560         .rename = cifs_rename,
 561         .permission = cifs_permission,
 562 #ifdef CONFIG_CIFS_XATTR
 563         .setxattr = cifs_setxattr,
 564         .getxattr = cifs_getxattr,
 565         .listxattr = cifs_listxattr,
 566         .removexattr = cifs_removexattr,
 567 #endif
 568 };
 569
 570 struct inode_operations cifs_symlink_inode_ops = {
 571         .readlink = generic_readlink,
 572         .follow_link = cifs_follow_link,
 573         .put_link = cifs_put_link,
 574         .permission = cifs_permission,
 575         /* BB add the following two eventually */
 576         /* revalidate: cifs_revalidate,
 577            setattr:    cifs_notify_change, *//* BB do we need notify change */
 578 #ifdef CONFIG_CIFS_XATTR
 579         .setxattr = cifs_setxattr,
 580         .getxattr = cifs_getxattr,
 581         .listxattr = cifs_listxattr,
 582         .removexattr = cifs_removexattr,
 583 #endif
 584 };
 585
 586 const struct file_operations cifs_file_ops = {
 587         .read = do_sync_read,
 588         .write = do_sync_write,
 589         .readv = generic_file_readv,
 590         .writev = cifs_file_writev,
 591         .aio_read = generic_file_aio_read,
 592         .aio_write = cifs_file_aio_write,
 593         .open = cifs_open,
 594         .release = cifs_close,
 595         .lock = cifs_lock,
 596         .fsync = cifs_fsync,
 597         .flush = cifs_flush,
 598         .mmap  = cifs_file_mmap,
 599         .sendfile = generic_file_sendfile,
 600         .llseek = cifs_llseek,
 601 #ifdef CONFIG_CIFS_POSIX
 602         .ioctl  = cifs_ioctl,
 603 #endif /* CONFIG_CIFS_POSIX */
 604
 605 #ifdef CONFIG_CIFS_EXPERIMENTAL
 606         .dir_notify = cifs_dir_notify,
 607 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 608 };
 609
 610 const struct file_operations cifs_file_direct_ops = {
 611         /* no mmap, no aio, no readv -
 612            BB reevaluate whether they can be done with directio, no cache */
 613         .read = cifs_user_read,
 614         .write = cifs_user_write,
 615         .open = cifs_open,
 616         .release = cifs_close,
 617         .lock = cifs_lock,
 618         .fsync = cifs_fsync,
 619         .flush = cifs_flush,
 620         .sendfile = generic_file_sendfile, /* BB removeme BB */
 621 #ifdef CONFIG_CIFS_POSIX
 622         .ioctl  = cifs_ioctl,
 623 #endif /* CONFIG_CIFS_POSIX */
 624         .llseek = cifs_llseek,
 625 #ifdef CONFIG_CIFS_EXPERIMENTAL
 626         .dir_notify = cifs_dir_notify,
 627 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 628 };
 629 const struct file_operations cifs_file_nobrl_ops = {
 630         .read = do_sync_read,
 631         .write = do_sync_write,
 632         .readv = generic_file_readv,
 633         .writev = cifs_file_writev,
 634         .aio_read = generic_file_aio_read,
 635         .aio_write = cifs_file_aio_write,
 636         .open = cifs_open,
 637         .release = cifs_close,
 638         .fsync = cifs_fsync,
 639         .flush = cifs_flush,
 640         .mmap  = cifs_file_mmap,
 641         .sendfile = generic_file_sendfile,
 642         .llseek = cifs_llseek,
 643 #ifdef CONFIG_CIFS_POSIX
 644         .ioctl  = cifs_ioctl,
 645 #endif /* CONFIG_CIFS_POSIX */
 646
 647 #ifdef CONFIG_CIFS_EXPERIMENTAL
 648         .dir_notify = cifs_dir_notify,
 649 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 650 };
 651
 652 const struct file_operations cifs_file_direct_nobrl_ops = {
 653         /* no mmap, no aio, no readv -
 654            BB reevaluate whether they can be done with directio, no cache */
 655         .read = cifs_user_read,
 656         .write = cifs_user_write,
 657         .open = cifs_open,
 658         .release = cifs_close,
 659         .fsync = cifs_fsync,
 660         .flush = cifs_flush,
 661         .sendfile = generic_file_sendfile, /* BB removeme BB */
 662 #ifdef CONFIG_CIFS_POSIX
 663         .ioctl  = cifs_ioctl,
 664 #endif /* CONFIG_CIFS_POSIX */
 665         .llseek = cifs_llseek,
 666 #ifdef CONFIG_CIFS_EXPERIMENTAL
 667         .dir_notify = cifs_dir_notify,
 668 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 669 };
 670
 671 const struct file_operations cifs_dir_ops = {
 672         .readdir = cifs_readdir,
 673         .release = cifs_closedir,
 674         .read    = generic_read_dir,
 675 #ifdef CONFIG_CIFS_EXPERIMENTAL
 676         .dir_notify = cifs_dir_notify,
 677 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 678         .ioctl  = cifs_ioctl,
 679 };
 680
 681 static void
 682 cifs_init_once(void *inode, kmem_cache_t * cachep, unsigned long flags)
 683 {
 684         struct cifsInodeInfo *cifsi = inode;
 685
 686         if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
 687             SLAB_CTOR_CONSTRUCTOR) {
 688                 inode_init_once(&cifsi->vfs_inode);
 689                 INIT_LIST_HEAD(&cifsi->lockList);
 690         }
 691 }
 692
 693 static int
 694 cifs_init_inodecache(void)
 695 {
 696         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
 697                                               sizeof (struct cifsInodeInfo),
 698                                               0, (SLAB_RECLAIM_ACCOUNT|
 699                                                 SLAB_MEM_SPREAD),
 700                                               cifs_init_once, NULL);
 701         if (cifs_inode_cachep == NULL)
 702                 return -ENOMEM;
 703
 704         return 0;
 705 }
 706
 707 static void
 708 cifs_destroy_inodecache(void)
 709 {
 710         if (kmem_cache_destroy(cifs_inode_cachep))
 711                 printk(KERN_WARNING "cifs_inode_cache: error freeing\n");
 712 }
 713
 714 static int
 715 cifs_init_request_bufs(void)
 716 {
 717         if(CIFSMaxBufSize < 8192) {
 718         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
 719         Unicode path name has to fit in any SMB/CIFS path based frames */
 720                 CIFSMaxBufSize = 8192;
 721         } else if (CIFSMaxBufSize > 1024*127) {
 722                 CIFSMaxBufSize = 1024 * 127;
 723         } else {
 724                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
 725         }
 726 /*      cERROR(1,("CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize)); */
 727         cifs_req_cachep = kmem_cache_create("cifs_request",
 728                                             CIFSMaxBufSize +
 729                                             MAX_CIFS_HDR_SIZE, 0,
 730                                             SLAB_HWCACHE_ALIGN, NULL, NULL);
 731         if (cifs_req_cachep == NULL)
 732                 return -ENOMEM;
 733
 734         if(cifs_min_rcv < 1)
 735                 cifs_min_rcv = 1;
 736         else if (cifs_min_rcv > 64) {
 737                 cifs_min_rcv = 64;
 738                 cERROR(1,("cifs_min_rcv set to maximum (64)"));
 739         }
 740
 741         cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
 742                                                   cifs_req_cachep);
 743
 744         if(cifs_req_poolp == NULL) {
 745                 kmem_cache_destroy(cifs_req_cachep);
 746                 return -ENOMEM;
 747         }
 748         /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
 749         almost all handle based requests (but not write response, nor is it
 750         sufficient for path based requests).  A smaller size would have
 751         been more efficient (compacting multiple slab items on one 4k page)
 752         for the case in which debug was on, but this larger size allows
 753         more SMBs to use small buffer alloc and is still much more
 754         efficient to alloc 1 per page off the slab compared to 17K (5page)
 755         alloc of large cifs buffers even when page debugging is on */
 756         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
 757                         MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
 758                         NULL, NULL);
 759         if (cifs_sm_req_cachep == NULL) {
 760                 mempool_destroy(cifs_req_poolp);
 761                 kmem_cache_destroy(cifs_req_cachep);
 762                 return -ENOMEM;
 763         }
 764
 765         if(cifs_min_small < 2)
 766                 cifs_min_small = 2;
 767         else if (cifs_min_small > 256) {
 768                 cifs_min_small = 256;
 769                 cFYI(1,("cifs_min_small set to maximum (256)"));
 770         }
 771
 772         cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
 773                                                      cifs_sm_req_cachep);
 774
 775         if(cifs_sm_req_poolp == NULL) {
 776                 mempool_destroy(cifs_req_poolp);
 777                 kmem_cache_destroy(cifs_req_cachep);
 778                 kmem_cache_destroy(cifs_sm_req_cachep);
 779                 return -ENOMEM;
 780         }
 781
 782         return 0;
 783 }
 784
 785 static void
 786 cifs_destroy_request_bufs(void)
 787 {
 788         mempool_destroy(cifs_req_poolp);
 789         if (kmem_cache_destroy(cifs_req_cachep))
 790                 printk(KERN_WARNING
 791                        "cifs_destroy_request_cache: error not all structures were freed\n");
 792         mempool_destroy(cifs_sm_req_poolp);
 793         if (kmem_cache_destroy(cifs_sm_req_cachep))
 794                 printk(KERN_WARNING
 795                       "cifs_destroy_request_cache: cifs_small_rq free error\n");
 796 }
 797
 798 static int
 799 cifs_init_mids(void)
 800 {
 801         cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
 802                                 sizeof (struct mid_q_entry), 0,
 803                                 SLAB_HWCACHE_ALIGN, NULL, NULL);
 804         if (cifs_mid_cachep == NULL)
 805                 return -ENOMEM;
 806
 807         /* 3 is a reasonable minimum number of simultaneous operations */
 808         cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
 809         if(cifs_mid_poolp == NULL) {
 810                 kmem_cache_destroy(cifs_mid_cachep);
 811                 return -ENOMEM;
 812         }
 813
 814         cifs_oplock_cachep = kmem_cache_create("cifs_oplock_structs",
 815                                 sizeof (struct oplock_q_entry), 0,
 816                                 SLAB_HWCACHE_ALIGN, NULL, NULL);
 817         if (cifs_oplock_cachep == NULL) {
 818                 kmem_cache_destroy(cifs_mid_cachep);
 819                 mempool_destroy(cifs_mid_poolp);
 820                 return -ENOMEM;
 821         }
 822
 823         return 0;
 824 }
 825
 826 static void
 827 cifs_destroy_mids(void)
 828 {
 829         mempool_destroy(cifs_mid_poolp);
 830         if (kmem_cache_destroy(cifs_mid_cachep))
 831                 printk(KERN_WARNING
 832                        "cifs_destroy_mids: error not all structures were freed\n");
 833
 834         if (kmem_cache_destroy(cifs_oplock_cachep))
 835                 printk(KERN_WARNING
 836                        "error not all oplock structures were freed\n");
 837 }
 838
 839 static int cifs_oplock_thread(void * dummyarg)
 840 {
 841         struct oplock_q_entry * oplock_item;
 842         struct cifsTconInfo *pTcon;
 843         struct inode * inode;
 844         __u16  netfid;
 845         int rc;
 846
 847         daemonize("cifsoplockd");
 848         allow_signal(SIGTERM);
 849
 850         oplockThread = current;
 851         do {
 852                 if (try_to_freeze())
 853                         continue;
 854
 855                 spin_lock(&GlobalMid_Lock);
 856                 if(list_empty(&GlobalOplock_Q)) {
 857                         spin_unlock(&GlobalMid_Lock);
 858                         set_current_state(TASK_INTERRUPTIBLE);
 859                         schedule_timeout(39*HZ);
 860                 } else {
 861                         oplock_item = list_entry(GlobalOplock_Q.next,
 862                                 struct oplock_q_entry, qhead);
 863                         if(oplock_item) {
 864                                 cFYI(1,("found oplock item to write out"));
 865                                 pTcon = oplock_item->tcon;
 866                                 inode = oplock_item->pinode;
 867                                 netfid = oplock_item->netfid;
 868                                 spin_unlock(&GlobalMid_Lock);
 869                                 DeleteOplockQEntry(oplock_item);
 870                                 /* can not grab inode sem here since it would
 871                                 deadlock when oplock received on delete
 872                                 since vfs_unlink holds the i_mutex across
 873                                 the call */
 874                                 /* mutex_lock(&inode->i_mutex);*/
 875                                 if (S_ISREG(inode->i_mode)) {
 876                                         rc = filemap_fdatawrite(inode->i_mapping);
 877                                         if(CIFS_I(inode)->clientCanCacheRead == 0) {
 878                                                 filemap_fdatawait(inode->i_mapping);
 879                                                 invalidate_remote_inode(inode);
 880                                         }
 881                                 } else
 882                                         rc = 0;
 883                                 /* mutex_unlock(&inode->i_mutex);*/
 884                                 if (rc)
 885                                         CIFS_I(inode)->write_behind_rc = rc;
 886                                 cFYI(1,("Oplock flush inode %p rc %d",inode,rc));
 887
 888                                 /* releasing a stale oplock after recent reconnection
 889                                 of smb session using a now incorrect file
 890                                 handle is not a data integrity issue but do
 891                                 not bother sending an oplock release if session
 892                                 to server still is disconnected since oplock
 893                                 already released by the server in that case */
 894                                 if(pTcon->tidStatus != CifsNeedReconnect) {
 895                                     rc = CIFSSMBLock(0, pTcon, netfid,
 896                                             0 /* len */ , 0 /* offset */, 0,
 897                                             0, LOCKING_ANDX_OPLOCK_RELEASE,
 898                                             0 /* wait flag */);
 899                                         cFYI(1,("Oplock release rc = %d ",rc));
 900                                 }
 901                         } else
 902                                 spin_unlock(&GlobalMid_Lock);
 903                         set_current_state(TASK_INTERRUPTIBLE);
 904                         schedule_timeout(1);  /* yield in case q were corrupt */
 905                 }
 906         } while(!signal_pending(current));
 907         oplockThread = NULL;
 908         complete_and_exit (&cifs_oplock_exited, 0);
 909 }
 910
 911 static int cifs_dnotify_thread(void * dummyarg)
 912 {
 913         struct list_head *tmp;
 914         struct cifsSesInfo *ses;
 915
 916         daemonize("cifsdnotifyd");
 917         allow_signal(SIGTERM);
 918
 919         dnotifyThread = current;
 920         do {
 921                 if(try_to_freeze())
 922                         continue;
 923                 set_current_state(TASK_INTERRUPTIBLE);
 924                 schedule_timeout(15*HZ);
 925                 read_lock(&GlobalSMBSeslock);
 926                 /* check if any stuck requests that need
 927                    to be woken up and wakeq so the
 928                    thread can wake up and error out */
 929                 list_for_each(tmp, &GlobalSMBSessionList) {
 930                         ses = list_entry(tmp, struct cifsSesInfo,
 931                                 cifsSessionList);
 932                         if(ses && ses->server &&
 933                              atomic_read(&ses->server->inFlight))
 934                                 wake_up_all(&ses->server->response_q);
 935                 }
 936                 read_unlock(&GlobalSMBSeslock);
 937         } while(!signal_pending(current));
 938         complete_and_exit (&cifs_dnotify_exited, 0);
 939 }
 940
 941 static int __init
 942 init_cifs(void)
 943 {
 944         int rc = 0;
 945 #ifdef CONFIG_PROC_FS
 946         cifs_proc_init();
 947 #endif
 948         INIT_LIST_HEAD(&GlobalServerList);      /* BB not implemented yet */
 949         INIT_LIST_HEAD(&GlobalSMBSessionList);
 950         INIT_LIST_HEAD(&GlobalTreeConnectionList);
 951         INIT_LIST_HEAD(&GlobalOplock_Q);
 952 #ifdef CONFIG_CIFS_EXPERIMENTAL
 953         INIT_LIST_HEAD(&GlobalDnotifyReqList);
 954         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
 955 #endif
 956 /*
 957  *  Initialize Global counters
 958  */
 959         atomic_set(&sesInfoAllocCount, 0);
 960         atomic_set(&tconInfoAllocCount, 0);
 961         atomic_set(&tcpSesAllocCount,0);
 962         atomic_set(&tcpSesReconnectCount, 0);
 963         atomic_set(&tconInfoReconnectCount, 0);
 964
 965         atomic_set(&bufAllocCount, 0);
 966         atomic_set(&smBufAllocCount, 0);
 967 #ifdef CONFIG_CIFS_STATS2
 968         atomic_set(&totBufAllocCount, 0);
 969         atomic_set(&totSmBufAllocCount, 0);
 970 #endif /* CONFIG_CIFS_STATS2 */
 971
 972         atomic_set(&midCount, 0);
 973         GlobalCurrentXid = 0;
 974         GlobalTotalActiveXid = 0;
 975         GlobalMaxActiveXid = 0;
 976         rwlock_init(&GlobalSMBSeslock);
 977         spin_lock_init(&GlobalMid_Lock);
 978
 979         if(cifs_max_pending < 2) {
 980                 cifs_max_pending = 2;
 981                 cFYI(1,("cifs_max_pending set to min of 2"));
 982         } else if(cifs_max_pending > 256) {
 983                 cifs_max_pending = 256;
 984                 cFYI(1,("cifs_max_pending set to max of 256"));
 985         }
 986
 987         rc = cifs_init_inodecache();
 988         if (!rc) {
 989                 rc = cifs_init_mids();
 990                 if (!rc) {
 991                         rc = cifs_init_request_bufs();
 992                         if (!rc) {
 993                                 rc = register_filesystem(&cifs_fs_type);
 994                                 if (!rc) {
 995                                         rc = (int)kernel_thread(cifs_oplock_thread, NULL,
 996                                                 CLONE_FS | CLONE_FILES | CLONE_VM);
 997                                         if(rc > 0) {
 998                                                 rc = (int)kernel_thread(cifs_dnotify_thread, NULL,
 999                                                         CLONE_FS | CLONE_FILES | CLONE_VM);
1000                                                 if(rc > 0)
1001                                                         return 0;
1002                                                 else
1003                                                         cERROR(1,("error %d create dnotify thread", rc));
1004                                         } else {
1005                                                 cERROR(1,("error %d create oplock thread",rc));
1006                                         }
1007                                 }
1008                                 cifs_destroy_request_bufs();
1009                         }
1010                         cifs_destroy_mids();
1011                 }
1012                 cifs_destroy_inodecache();
1013         }
1014 #ifdef CONFIG_PROC_FS
1015         cifs_proc_clean();
1016 #endif
1017         return rc;
1018 }
1019
1020 static void __exit
1021 exit_cifs(void)
1022 {
1023         cFYI(0, ("In unregister ie exit_cifs"));
1024 #ifdef CONFIG_PROC_FS
1025         cifs_proc_clean();
1026 #endif
1027         unregister_filesystem(&cifs_fs_type);
1028         cifs_destroy_inodecache();
1029         cifs_destroy_mids();
1030         cifs_destroy_request_bufs();
1031         if(oplockThread) {
1032                 send_sig(SIGTERM, oplockThread, 1);
1033                 wait_for_completion(&cifs_oplock_exited);
1034         }
1035         if(dnotifyThread) {
1036                 send_sig(SIGTERM, dnotifyThread, 1);
1037                 wait_for_completion(&cifs_dnotify_exited);
1038         }
1039 }
1040
1041 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1042 MODULE_LICENSE("GPL");          /* combination of LGPL + GPL source behaves as GPL */
1043 MODULE_DESCRIPTION
1044     ("VFS to access servers complying with the SNIA CIFS Specification e.g. Samba and Windows");
1045 MODULE_VERSION(CIFS_VERSION);
1046 module_init(init_cifs)
1047 module_exit(exit_cifs)