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 <linux/kthread.h>
  37 #include <linux/freezer.h>
  38 #include "cifsfs.h"
  39 #include "cifspdu.h"
  40 #define DECLARE_GLOBALS_HERE
  41 #include "cifsglob.h"
  42 #include "cifsproto.h"
  43 #include "cifs_debug.h"
  44 #include "cifs_fs_sb.h"
  45 #include <linux/mm.h>
  46 #define CIFS_MAGIC_NUMBER 0xFF534D42    /* the first four bytes of SMB PDUs */
  47
  48 #ifdef CONFIG_CIFS_QUOTA
  49 static struct quotactl_ops cifs_quotactl_ops;
  50 #endif
  51
  52 int cifsFYI = 0;
  53 int cifsERROR = 1;
  54 int traceSMB = 0;
  55 unsigned int oplockEnabled = 1;
  56 unsigned int experimEnabled = 0;
  57 unsigned int linuxExtEnabled = 1;
  58 unsigned int lookupCacheEnabled = 1;
  59 unsigned int multiuser_mount = 0;
  60 unsigned int extended_security = CIFSSEC_DEF;
  61 /* unsigned int ntlmv2_support = 0; */
  62 unsigned int sign_CIFS_PDUs = 1;
  63 extern struct task_struct * oplockThread; /* remove sparse warning */
  64 struct task_struct * oplockThread = NULL;
  65 extern struct task_struct * dnotifyThread; /* remove sparse warning */
  66 struct task_struct * dnotifyThread = NULL;
  67 static struct super_operations cifs_super_ops;
  68 unsigned int CIFSMaxBufSize = CIFS_MAX_MSGSIZE;
  69 module_param(CIFSMaxBufSize, int, 0);
  70 MODULE_PARM_DESC(CIFSMaxBufSize,"Network buffer size (not including header). Default: 16384 Range: 8192 to 130048");
  71 unsigned int cifs_min_rcv = CIFS_MIN_RCV_POOL;
  72 module_param(cifs_min_rcv, int, 0);
  73 MODULE_PARM_DESC(cifs_min_rcv,"Network buffers in pool. Default: 4 Range: 1 to 64");
  74 unsigned int cifs_min_small = 30;
  75 module_param(cifs_min_small, int, 0);
  76 MODULE_PARM_DESC(cifs_min_small,"Small network buffers in pool. Default: 30 Range: 2 to 256");
  77 unsigned int cifs_max_pending = CIFS_MAX_REQ;
  78 module_param(cifs_max_pending, int, 0);
  79 MODULE_PARM_DESC(cifs_max_pending,"Simultaneous requests to server. Default: 50 Range: 2 to 256");
  80
  81 extern mempool_t *cifs_sm_req_poolp;
  82 extern mempool_t *cifs_req_poolp;
  83 extern mempool_t *cifs_mid_poolp;
  84
  85 extern struct kmem_cache *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 = kzalloc(sizeof(struct cifs_sb_info),GFP_KERNEL);
  97         cifs_sb = CIFS_SB(sb);
  98         if(cifs_sb == NULL)
  99                 return -ENOMEM;
 100
 101         rc = cifs_mount(sb, cifs_sb, data, devname);
 102
 103         if (rc) {
 104                 if (!silent)
 105                         cERROR(1,
 106                                ("cifs_mount failed w/return code = %d", rc));
 107                 goto out_mount_failed;
 108         }
 109
 110         sb->s_magic = CIFS_MAGIC_NUMBER;
 111         sb->s_op = &cifs_super_ops;
 112 /*      if(cifs_sb->tcon->ses->server->maxBuf > MAX_CIFS_HDR_SIZE + 512)
 113             sb->s_blocksize = cifs_sb->tcon->ses->server->maxBuf - MAX_CIFS_HDR_SIZE; */
 114 #ifdef CONFIG_CIFS_QUOTA
 115         sb->s_qcop = &cifs_quotactl_ops;
 116 #endif
 117         sb->s_blocksize = CIFS_MAX_MSGSIZE;
 118         sb->s_blocksize_bits = 14;      /* default 2**14 = CIFS_MAX_MSGSIZE */
 119         inode = iget(sb, ROOT_I);
 120
 121         if (!inode) {
 122                 rc = -ENOMEM;
 123                 goto out_no_root;
 124         }
 125
 126         sb->s_root = d_alloc_root(inode);
 127
 128         if (!sb->s_root) {
 129                 rc = -ENOMEM;
 130                 goto out_no_root;
 131         }
 132
 133         return 0;
 134
 135 out_no_root:
 136         cERROR(1, ("cifs_read_super: get root inode failed"));
 137         if (inode)
 138                 iput(inode);
 139
 140 out_mount_failed:
 141         if(cifs_sb) {
 142                 if(cifs_sb->local_nls)
 143                         unload_nls(cifs_sb->local_nls);
 144                 kfree(cifs_sb);
 145         }
 146         return rc;
 147 }
 148
 149 static void
 150 cifs_put_super(struct super_block *sb)
 151 {
 152         int rc = 0;
 153         struct cifs_sb_info *cifs_sb;
 154
 155         cFYI(1, ("In cifs_put_super"));
 156         cifs_sb = CIFS_SB(sb);
 157         if(cifs_sb == NULL) {
 158                 cFYI(1,("Empty cifs superblock info passed to unmount"));
 159                 return;
 160         }
 161         rc = cifs_umount(sb, cifs_sb);
 162         if (rc) {
 163                 cERROR(1, ("cifs_umount failed with return code %d", rc));
 164         }
 165         unload_nls(cifs_sb->local_nls);
 166         kfree(cifs_sb);
 167         return;
 168 }
 169
 170 static int
 171 cifs_statfs(struct dentry *dentry, struct kstatfs *buf)
 172 {
 173         struct super_block *sb = dentry->d_sb;
 174         int xid;
 175         int rc = -EOPNOTSUPP;
 176         struct cifs_sb_info *cifs_sb;
 177         struct cifsTconInfo *pTcon;
 178
 179         xid = GetXid();
 180
 181         cifs_sb = CIFS_SB(sb);
 182         pTcon = cifs_sb->tcon;
 183
 184         buf->f_type = CIFS_MAGIC_NUMBER;
 185
 186         /* instead could get the real value via SMB_QUERY_FS_ATTRIBUTE_INFO */
 187         buf->f_namelen = PATH_MAX; /* PATH_MAX may be too long - it would
 188                                       presumably be total path, but note
 189                                       that some servers (includinng Samba 3)
 190                                       have a shorter maximum path */
 191         buf->f_files = 0;       /* undefined */
 192         buf->f_ffree = 0;       /* unlimited */
 193
 194 /* BB we could add a second check for a QFS Unix capability bit */
 195 /* BB FIXME check CIFS_POSIX_EXTENSIONS Unix cap first FIXME BB */
 196     if ((pTcon->ses->capabilities & CAP_UNIX) && (CIFS_POSIX_EXTENSIONS &
 197                         le64_to_cpu(pTcon->fsUnixInfo.Capability)))
 198             rc = CIFSSMBQFSPosixInfo(xid, pTcon, buf);
 199
 200     /* Only need to call the old QFSInfo if failed
 201     on newer one */
 202     if(rc)
 203         if(pTcon->ses->capabilities & CAP_NT_SMBS)
 204                 rc = CIFSSMBQFSInfo(xid, pTcon, buf); /* not supported by OS2 */
 205
 206         /* Some old Windows servers also do not support level 103, retry with
 207            older level one if old server failed the previous call or we
 208            bypassed it because we detected that this was an older LANMAN sess */
 209         if(rc)
 210                 rc = SMBOldQFSInfo(xid, pTcon, buf);
 211         /*
 212            int f_type;
 213            __fsid_t f_fsid;
 214            int f_namelen;  */
 215         /* BB get from info in tcon struct at mount time call to QFSAttrInfo */
 216         FreeXid(xid);
 217         return 0;               /* always return success? what if volume is no
 218                                    longer available? */
 219 }
 220
 221 static int cifs_permission(struct inode * inode, int mask, struct nameidata *nd)
 222 {
 223         struct cifs_sb_info *cifs_sb;
 224
 225         cifs_sb = CIFS_SB(inode->i_sb);
 226
 227         if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_PERM) {
 228                 return 0;
 229         } else /* file mode might have been restricted at mount time
 230                 on the client (above and beyond ACL on servers) for
 231                 servers which do not support setting and viewing mode bits,
 232                 so allowing client to check permissions is useful */
 233                 return generic_permission(inode, mask, NULL);
 234 }
 235
 236 static struct kmem_cache *cifs_inode_cachep;
 237 static struct kmem_cache *cifs_req_cachep;
 238 static struct kmem_cache *cifs_mid_cachep;
 239 struct kmem_cache *cifs_oplock_cachep;
 240 static struct kmem_cache *cifs_sm_req_cachep;
 241 mempool_t *cifs_sm_req_poolp;
 242 mempool_t *cifs_req_poolp;
 243 mempool_t *cifs_mid_poolp;
 244
 245 static struct inode *
 246 cifs_alloc_inode(struct super_block *sb)
 247 {
 248         struct cifsInodeInfo *cifs_inode;
 249         cifs_inode = kmem_cache_alloc(cifs_inode_cachep, GFP_KERNEL);
 250         if (!cifs_inode)
 251                 return NULL;
 252         cifs_inode->cifsAttrs = 0x20;   /* default */
 253         atomic_set(&cifs_inode->inUse, 0);
 254         cifs_inode->time = 0;
 255         /* Until the file is open and we have gotten oplock
 256         info back from the server, can not assume caching of
 257         file data or metadata */
 258         cifs_inode->clientCanCacheRead = FALSE;
 259         cifs_inode->clientCanCacheAll = FALSE;
 260         cifs_inode->vfs_inode.i_blkbits = 14;  /* 2**14 = CIFS_MAX_MSGSIZE */
 261         cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;
 262         INIT_LIST_HEAD(&cifs_inode->openFileList);
 263         return &cifs_inode->vfs_inode;
 264 }
 265
 266 static void
 267 cifs_destroy_inode(struct inode *inode)
 268 {
 269         kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
 270 }
 271
 272 /*
 273  * cifs_show_options() is for displaying mount options in /proc/mounts.
 274  * Not all settable options are displayed but most of the important
 275  * ones are.
 276  */
 277 static int
 278 cifs_show_options(struct seq_file *s, struct vfsmount *m)
 279 {
 280         struct cifs_sb_info *cifs_sb;
 281
 282         cifs_sb = CIFS_SB(m->mnt_sb);
 283
 284         if (cifs_sb) {
 285                 if (cifs_sb->tcon) {
 286                         seq_printf(s, ",unc=%s", cifs_sb->tcon->treeName);
 287                         if (cifs_sb->tcon->ses) {
 288                                 if (cifs_sb->tcon->ses->userName)
 289                                         seq_printf(s, ",username=%s",
 290                                            cifs_sb->tcon->ses->userName);
 291                                 if(cifs_sb->tcon->ses->domainName)
 292                                         seq_printf(s, ",domain=%s",
 293                                            cifs_sb->tcon->ses->domainName);
 294                         }
 295                 }
 296                 seq_printf(s, ",rsize=%d",cifs_sb->rsize);
 297                 seq_printf(s, ",wsize=%d",cifs_sb->wsize);
 298         }
 299         return 0;
 300 }
 301
 302 #ifdef CONFIG_CIFS_QUOTA
 303 int cifs_xquota_set(struct super_block * sb, int quota_type, qid_t qid,
 304                 struct fs_disk_quota * pdquota)
 305 {
 306         int xid;
 307         int rc = 0;
 308         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 309         struct cifsTconInfo *pTcon;
 310
 311         if(cifs_sb)
 312                 pTcon = cifs_sb->tcon;
 313         else
 314                 return -EIO;
 315
 316
 317         xid = GetXid();
 318         if(pTcon) {
 319                 cFYI(1,("set type: 0x%x id: %d",quota_type,qid));
 320         } else {
 321                 return -EIO;
 322         }
 323
 324         FreeXid(xid);
 325         return rc;
 326 }
 327
 328 int cifs_xquota_get(struct super_block * sb, int quota_type, qid_t qid,
 329                 struct fs_disk_quota * pdquota)
 330 {
 331         int xid;
 332         int rc = 0;
 333         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 334         struct cifsTconInfo *pTcon;
 335
 336         if(cifs_sb)
 337                 pTcon = cifs_sb->tcon;
 338         else
 339                 return -EIO;
 340
 341         xid = GetXid();
 342         if(pTcon) {
 343                 cFYI(1,("set type: 0x%x id: %d",quota_type,qid));
 344         } else {
 345                 rc = -EIO;
 346         }
 347
 348         FreeXid(xid);
 349         return rc;
 350 }
 351
 352 int cifs_xstate_set(struct super_block * sb, unsigned int flags, int operation)
 353 {
 354         int xid;
 355         int rc = 0;
 356         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 357         struct cifsTconInfo *pTcon;
 358
 359         if(cifs_sb)
 360                 pTcon = cifs_sb->tcon;
 361         else
 362                 return -EIO;
 363
 364         xid = GetXid();
 365         if(pTcon) {
 366                 cFYI(1,("flags: 0x%x operation: 0x%x",flags,operation));
 367         } else {
 368                 rc = -EIO;
 369         }
 370
 371         FreeXid(xid);
 372         return rc;
 373 }
 374
 375 int cifs_xstate_get(struct super_block * sb, struct fs_quota_stat *qstats)
 376 {
 377         int xid;
 378         int rc = 0;
 379         struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
 380         struct cifsTconInfo *pTcon;
 381
 382         if(cifs_sb) {
 383                 pTcon = cifs_sb->tcon;
 384         } else {
 385                 return -EIO;
 386         }
 387         xid = GetXid();
 388         if(pTcon) {
 389                 cFYI(1,("pqstats %p",qstats));
 390         } else {
 391                 rc = -EIO;
 392         }
 393
 394         FreeXid(xid);
 395         return rc;
 396 }
 397
 398 static struct quotactl_ops cifs_quotactl_ops = {
 399         .set_xquota     = cifs_xquota_set,
 400         .get_xquota     = cifs_xquota_set,
 401         .set_xstate     = cifs_xstate_set,
 402         .get_xstate     = cifs_xstate_get,
 403 };
 404 #endif
 405
 406 static void cifs_umount_begin(struct vfsmount * vfsmnt, int flags)
 407 {
 408         struct cifs_sb_info *cifs_sb;
 409         struct cifsTconInfo * tcon;
 410
 411         if (!(flags & MNT_FORCE))
 412                 return;
 413         cifs_sb = CIFS_SB(vfsmnt->mnt_sb);
 414         if(cifs_sb == NULL)
 415                 return;
 416
 417         tcon = cifs_sb->tcon;
 418         if(tcon == NULL)
 419                 return;
 420         down(&tcon->tconSem);
 421         if (atomic_read(&tcon->useCount) == 1)
 422                 tcon->tidStatus = CifsExiting;
 423         up(&tcon->tconSem);
 424
 425         /* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
 426         /* cancel_notify_requests(tcon); */
 427         if(tcon->ses && tcon->ses->server)
 428         {
 429                 cFYI(1,("wake up tasks now - umount begin not complete"));
 430                 wake_up_all(&tcon->ses->server->request_q);
 431                 wake_up_all(&tcon->ses->server->response_q);
 432                 msleep(1); /* yield */
 433                 /* we have to kick the requests once more */
 434                 wake_up_all(&tcon->ses->server->response_q);
 435                 msleep(1);
 436         }
 437 /* BB FIXME - finish add checks for tidStatus BB */
 438
 439         return;
 440 }
 441
 442 #ifdef CONFIG_CIFS_STATS2
 443 static int cifs_show_stats(struct seq_file *s, struct vfsmount *mnt)
 444 {
 445         /* BB FIXME */
 446         return 0;
 447 }
 448 #endif
 449
 450 static int cifs_remount(struct super_block *sb, int *flags, char *data)
 451 {
 452         *flags |= MS_NODIRATIME;
 453         return 0;
 454 }
 455
 456 static struct super_operations cifs_super_ops = {
 457         .read_inode = cifs_read_inode,
 458         .put_super = cifs_put_super,
 459         .statfs = cifs_statfs,
 460         .alloc_inode = cifs_alloc_inode,
 461         .destroy_inode = cifs_destroy_inode,
 462 /*      .drop_inode         = generic_delete_inode,
 463         .delete_inode   = cifs_delete_inode,  *//* Do not need the above two functions
 464    unless later we add lazy close of inodes or unless the kernel forgets to call
 465    us with the same number of releases (closes) as opens */
 466         .show_options = cifs_show_options,
 467         .umount_begin   = cifs_umount_begin,
 468         .remount_fs = cifs_remount,
 469 #ifdef CONFIG_CIFS_STATS2
 470         .show_stats = cifs_show_stats,
 471 #endif
 472 };
 473
 474 static int
 475 cifs_get_sb(struct file_system_type *fs_type,
 476             int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 477 {
 478         int rc;
 479         struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);
 480
 481         cFYI(1, ("Devname: %s flags: %d ", dev_name, flags));
 482
 483         if (IS_ERR(sb))
 484                 return PTR_ERR(sb);
 485
 486         sb->s_flags = flags;
 487
 488         rc = cifs_read_super(sb, data, dev_name, flags & MS_SILENT ? 1 : 0);
 489         if (rc) {
 490                 up_write(&sb->s_umount);
 491                 deactivate_super(sb);
 492                 return rc;
 493         }
 494         sb->s_flags |= MS_ACTIVE;
 495         return simple_set_mnt(mnt, sb);
 496 }
 497
 498 static ssize_t cifs_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 499                                    unsigned long nr_segs, loff_t pos)
 500 {
 501         struct inode *inode = iocb->ki_filp->f_dentry->d_inode;
 502         ssize_t written;
 503
 504         written = generic_file_aio_write(iocb, iov, nr_segs, pos);
 505         if (!CIFS_I(inode)->clientCanCacheAll)
 506                 filemap_fdatawrite(inode->i_mapping);
 507         return written;
 508 }
 509
 510 static loff_t cifs_llseek(struct file *file, loff_t offset, int origin)
 511 {
 512         /* origin == SEEK_END => we must revalidate the cached file length */
 513         if (origin == SEEK_END) {
 514                 int retval = cifs_revalidate(file->f_dentry);
 515                 if (retval < 0)
 516                         return (loff_t)retval;
 517         }
 518         return remote_llseek(file, offset, origin);
 519 }
 520
 521 static struct file_system_type cifs_fs_type = {
 522         .owner = THIS_MODULE,
 523         .name = "cifs",
 524         .get_sb = cifs_get_sb,
 525         .kill_sb = kill_anon_super,
 526         /*  .fs_flags */
 527 };
 528 struct inode_operations cifs_dir_inode_ops = {
 529         .create = cifs_create,
 530         .lookup = cifs_lookup,
 531         .getattr = cifs_getattr,
 532         .unlink = cifs_unlink,
 533         .link = cifs_hardlink,
 534         .mkdir = cifs_mkdir,
 535         .rmdir = cifs_rmdir,
 536         .rename = cifs_rename,
 537         .permission = cifs_permission,
 538 /*      revalidate:cifs_revalidate,   */
 539         .setattr = cifs_setattr,
 540         .symlink = cifs_symlink,
 541         .mknod   = cifs_mknod,
 542 #ifdef CONFIG_CIFS_XATTR
 543         .setxattr = cifs_setxattr,
 544         .getxattr = cifs_getxattr,
 545         .listxattr = cifs_listxattr,
 546         .removexattr = cifs_removexattr,
 547 #endif
 548 };
 549
 550 struct inode_operations cifs_file_inode_ops = {
 551 /*      revalidate:cifs_revalidate, */
 552         .setattr = cifs_setattr,
 553         .getattr = cifs_getattr, /* do we need this anymore? */
 554         .rename = cifs_rename,
 555         .permission = cifs_permission,
 556 #ifdef CONFIG_CIFS_XATTR
 557         .setxattr = cifs_setxattr,
 558         .getxattr = cifs_getxattr,
 559         .listxattr = cifs_listxattr,
 560         .removexattr = cifs_removexattr,
 561 #endif
 562 };
 563
 564 struct inode_operations cifs_symlink_inode_ops = {
 565         .readlink = generic_readlink,
 566         .follow_link = cifs_follow_link,
 567         .put_link = cifs_put_link,
 568         .permission = cifs_permission,
 569         /* BB add the following two eventually */
 570         /* revalidate: cifs_revalidate,
 571            setattr:    cifs_notify_change, *//* BB do we need notify change */
 572 #ifdef CONFIG_CIFS_XATTR
 573         .setxattr = cifs_setxattr,
 574         .getxattr = cifs_getxattr,
 575         .listxattr = cifs_listxattr,
 576         .removexattr = cifs_removexattr,
 577 #endif
 578 };
 579
 580 const struct file_operations cifs_file_ops = {
 581         .read = do_sync_read,
 582         .write = do_sync_write,
 583         .aio_read = generic_file_aio_read,
 584         .aio_write = cifs_file_aio_write,
 585         .open = cifs_open,
 586         .release = cifs_close,
 587         .lock = cifs_lock,
 588         .fsync = cifs_fsync,
 589         .flush = cifs_flush,
 590         .mmap  = cifs_file_mmap,
 591         .sendfile = generic_file_sendfile,
 592         .llseek = cifs_llseek,
 593 #ifdef CONFIG_CIFS_POSIX
 594         .ioctl  = cifs_ioctl,
 595 #endif /* CONFIG_CIFS_POSIX */
 596
 597 #ifdef CONFIG_CIFS_EXPERIMENTAL
 598         .dir_notify = cifs_dir_notify,
 599 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 600 };
 601
 602 const struct file_operations cifs_file_direct_ops = {
 603         /* no mmap, no aio, no readv -
 604            BB reevaluate whether they can be done with directio, no cache */
 605         .read = cifs_user_read,
 606         .write = cifs_user_write,
 607         .open = cifs_open,
 608         .release = cifs_close,
 609         .lock = cifs_lock,
 610         .fsync = cifs_fsync,
 611         .flush = cifs_flush,
 612         .sendfile = generic_file_sendfile, /* BB removeme BB */
 613 #ifdef CONFIG_CIFS_POSIX
 614         .ioctl  = cifs_ioctl,
 615 #endif /* CONFIG_CIFS_POSIX */
 616         .llseek = cifs_llseek,
 617 #ifdef CONFIG_CIFS_EXPERIMENTAL
 618         .dir_notify = cifs_dir_notify,
 619 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 620 };
 621 const struct file_operations cifs_file_nobrl_ops = {
 622         .read = do_sync_read,
 623         .write = do_sync_write,
 624         .aio_read = generic_file_aio_read,
 625         .aio_write = cifs_file_aio_write,
 626         .open = cifs_open,
 627         .release = cifs_close,
 628         .fsync = cifs_fsync,
 629         .flush = cifs_flush,
 630         .mmap  = cifs_file_mmap,
 631         .sendfile = generic_file_sendfile,
 632         .llseek = cifs_llseek,
 633 #ifdef CONFIG_CIFS_POSIX
 634         .ioctl  = cifs_ioctl,
 635 #endif /* CONFIG_CIFS_POSIX */
 636
 637 #ifdef CONFIG_CIFS_EXPERIMENTAL
 638         .dir_notify = cifs_dir_notify,
 639 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 640 };
 641
 642 const struct file_operations cifs_file_direct_nobrl_ops = {
 643         /* no mmap, no aio, no readv -
 644            BB reevaluate whether they can be done with directio, no cache */
 645         .read = cifs_user_read,
 646         .write = cifs_user_write,
 647         .open = cifs_open,
 648         .release = cifs_close,
 649         .fsync = cifs_fsync,
 650         .flush = cifs_flush,
 651         .sendfile = generic_file_sendfile, /* BB removeme BB */
 652 #ifdef CONFIG_CIFS_POSIX
 653         .ioctl  = cifs_ioctl,
 654 #endif /* CONFIG_CIFS_POSIX */
 655         .llseek = cifs_llseek,
 656 #ifdef CONFIG_CIFS_EXPERIMENTAL
 657         .dir_notify = cifs_dir_notify,
 658 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 659 };
 660
 661 const struct file_operations cifs_dir_ops = {
 662         .readdir = cifs_readdir,
 663         .release = cifs_closedir,
 664         .read    = generic_read_dir,
 665 #ifdef CONFIG_CIFS_EXPERIMENTAL
 666         .dir_notify = cifs_dir_notify,
 667 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 668         .ioctl  = cifs_ioctl,
 669 };
 670
 671 static void
 672 cifs_init_once(void *inode, struct kmem_cache * cachep, unsigned long flags)
 673 {
 674         struct cifsInodeInfo *cifsi = inode;
 675
 676         if ((flags & (SLAB_CTOR_VERIFY | SLAB_CTOR_CONSTRUCTOR)) ==
 677             SLAB_CTOR_CONSTRUCTOR) {
 678                 inode_init_once(&cifsi->vfs_inode);
 679                 INIT_LIST_HEAD(&cifsi->lockList);
 680         }
 681 }
 682
 683 static int
 684 cifs_init_inodecache(void)
 685 {
 686         cifs_inode_cachep = kmem_cache_create("cifs_inode_cache",
 687                                               sizeof (struct cifsInodeInfo),
 688                                               0, (SLAB_RECLAIM_ACCOUNT|
 689                                                 SLAB_MEM_SPREAD),
 690                                               cifs_init_once, NULL);
 691         if (cifs_inode_cachep == NULL)
 692                 return -ENOMEM;
 693
 694         return 0;
 695 }
 696
 697 static void
 698 cifs_destroy_inodecache(void)
 699 {
 700         kmem_cache_destroy(cifs_inode_cachep);
 701 }
 702
 703 static int
 704 cifs_init_request_bufs(void)
 705 {
 706         if(CIFSMaxBufSize < 8192) {
 707         /* Buffer size can not be smaller than 2 * PATH_MAX since maximum
 708         Unicode path name has to fit in any SMB/CIFS path based frames */
 709                 CIFSMaxBufSize = 8192;
 710         } else if (CIFSMaxBufSize > 1024*127) {
 711                 CIFSMaxBufSize = 1024 * 127;
 712         } else {
 713                 CIFSMaxBufSize &= 0x1FE00; /* Round size to even 512 byte mult*/
 714         }
 715 /*      cERROR(1,("CIFSMaxBufSize %d 0x%x",CIFSMaxBufSize,CIFSMaxBufSize)); */
 716         cifs_req_cachep = kmem_cache_create("cifs_request",
 717                                             CIFSMaxBufSize +
 718                                             MAX_CIFS_HDR_SIZE, 0,
 719                                             SLAB_HWCACHE_ALIGN, NULL, NULL);
 720         if (cifs_req_cachep == NULL)
 721                 return -ENOMEM;
 722
 723         if(cifs_min_rcv < 1)
 724                 cifs_min_rcv = 1;
 725         else if (cifs_min_rcv > 64) {
 726                 cifs_min_rcv = 64;
 727                 cERROR(1,("cifs_min_rcv set to maximum (64)"));
 728         }
 729
 730         cifs_req_poolp = mempool_create_slab_pool(cifs_min_rcv,
 731                                                   cifs_req_cachep);
 732
 733         if(cifs_req_poolp == NULL) {
 734                 kmem_cache_destroy(cifs_req_cachep);
 735                 return -ENOMEM;
 736         }
 737         /* MAX_CIFS_SMALL_BUFFER_SIZE bytes is enough for most SMB responses and
 738         almost all handle based requests (but not write response, nor is it
 739         sufficient for path based requests).  A smaller size would have
 740         been more efficient (compacting multiple slab items on one 4k page)
 741         for the case in which debug was on, but this larger size allows
 742         more SMBs to use small buffer alloc and is still much more
 743         efficient to alloc 1 per page off the slab compared to 17K (5page)
 744         alloc of large cifs buffers even when page debugging is on */
 745         cifs_sm_req_cachep = kmem_cache_create("cifs_small_rq",
 746                         MAX_CIFS_SMALL_BUFFER_SIZE, 0, SLAB_HWCACHE_ALIGN,
 747                         NULL, NULL);
 748         if (cifs_sm_req_cachep == NULL) {
 749                 mempool_destroy(cifs_req_poolp);
 750                 kmem_cache_destroy(cifs_req_cachep);
 751                 return -ENOMEM;
 752         }
 753
 754         if(cifs_min_small < 2)
 755                 cifs_min_small = 2;
 756         else if (cifs_min_small > 256) {
 757                 cifs_min_small = 256;
 758                 cFYI(1,("cifs_min_small set to maximum (256)"));
 759         }
 760
 761         cifs_sm_req_poolp = mempool_create_slab_pool(cifs_min_small,
 762                                                      cifs_sm_req_cachep);
 763
 764         if(cifs_sm_req_poolp == NULL) {
 765                 mempool_destroy(cifs_req_poolp);
 766                 kmem_cache_destroy(cifs_req_cachep);
 767                 kmem_cache_destroy(cifs_sm_req_cachep);
 768                 return -ENOMEM;
 769         }
 770
 771         return 0;
 772 }
 773
 774 static void
 775 cifs_destroy_request_bufs(void)
 776 {
 777         mempool_destroy(cifs_req_poolp);
 778         kmem_cache_destroy(cifs_req_cachep);
 779         mempool_destroy(cifs_sm_req_poolp);
 780         kmem_cache_destroy(cifs_sm_req_cachep);
 781 }
 782
 783 static int
 784 cifs_init_mids(void)
 785 {
 786         cifs_mid_cachep = kmem_cache_create("cifs_mpx_ids",
 787                                 sizeof (struct mid_q_entry), 0,
 788                                 SLAB_HWCACHE_ALIGN, NULL, NULL);
 789         if (cifs_mid_cachep == NULL)
 790                 return -ENOMEM;
 791
 792         /* 3 is a reasonable minimum number of simultaneous operations */
 793         cifs_mid_poolp = mempool_create_slab_pool(3, cifs_mid_cachep);
 794         if(cifs_mid_poolp == NULL) {
 795                 kmem_cache_destroy(cifs_mid_cachep);
 796                 return -ENOMEM;
 797         }
 798
 799         cifs_oplock_cachep = kmem_cache_create("cifs_oplock_structs",
 800                                 sizeof (struct oplock_q_entry), 0,
 801                                 SLAB_HWCACHE_ALIGN, NULL, NULL);
 802         if (cifs_oplock_cachep == NULL) {
 803                 kmem_cache_destroy(cifs_mid_cachep);
 804                 mempool_destroy(cifs_mid_poolp);
 805                 return -ENOMEM;
 806         }
 807
 808         return 0;
 809 }
 810
 811 static void
 812 cifs_destroy_mids(void)
 813 {
 814         mempool_destroy(cifs_mid_poolp);
 815         kmem_cache_destroy(cifs_mid_cachep);
 816         kmem_cache_destroy(cifs_oplock_cachep);
 817 }
 818
 819 static int cifs_oplock_thread(void * dummyarg)
 820 {
 821         struct oplock_q_entry * oplock_item;
 822         struct cifsTconInfo *pTcon;
 823         struct inode * inode;
 824         __u16  netfid;
 825         int rc;
 826
 827         do {
 828                 if (try_to_freeze())
 829                         continue;
 830
 831                 spin_lock(&GlobalMid_Lock);
 832                 if(list_empty(&GlobalOplock_Q)) {
 833                         spin_unlock(&GlobalMid_Lock);
 834                         set_current_state(TASK_INTERRUPTIBLE);
 835                         schedule_timeout(39*HZ);
 836                 } else {
 837                         oplock_item = list_entry(GlobalOplock_Q.next,
 838                                 struct oplock_q_entry, qhead);
 839                         if(oplock_item) {
 840                                 cFYI(1,("found oplock item to write out"));
 841                                 pTcon = oplock_item->tcon;
 842                                 inode = oplock_item->pinode;
 843                                 netfid = oplock_item->netfid;
 844                                 spin_unlock(&GlobalMid_Lock);
 845                                 DeleteOplockQEntry(oplock_item);
 846                                 /* can not grab inode sem here since it would
 847                                 deadlock when oplock received on delete
 848                                 since vfs_unlink holds the i_mutex across
 849                                 the call */
 850                                 /* mutex_lock(&inode->i_mutex);*/
 851                                 if (S_ISREG(inode->i_mode)) {
 852                                         rc = filemap_fdatawrite(inode->i_mapping);
 853                                         if(CIFS_I(inode)->clientCanCacheRead == 0) {
 854                                                 filemap_fdatawait(inode->i_mapping);
 855                                                 invalidate_remote_inode(inode);
 856                                         }
 857                                 } else
 858                                         rc = 0;
 859                                 /* mutex_unlock(&inode->i_mutex);*/
 860                                 if (rc)
 861                                         CIFS_I(inode)->write_behind_rc = rc;
 862                                 cFYI(1,("Oplock flush inode %p rc %d",inode,rc));
 863
 864                                 /* releasing a stale oplock after recent reconnection
 865                                 of smb session using a now incorrect file
 866                                 handle is not a data integrity issue but do
 867                                 not bother sending an oplock release if session
 868                                 to server still is disconnected since oplock
 869                                 already released by the server in that case */
 870                                 if(pTcon->tidStatus != CifsNeedReconnect) {
 871                                     rc = CIFSSMBLock(0, pTcon, netfid,
 872                                             0 /* len */ , 0 /* offset */, 0,
 873                                             0, LOCKING_ANDX_OPLOCK_RELEASE,
 874                                             0 /* wait flag */);
 875                                         cFYI(1,("Oplock release rc = %d ",rc));
 876                                 }
 877                         } else
 878                                 spin_unlock(&GlobalMid_Lock);
 879                         set_current_state(TASK_INTERRUPTIBLE);
 880                         schedule_timeout(1);  /* yield in case q were corrupt */
 881                 }
 882         } while (!kthread_should_stop());
 883
 884         return 0;
 885 }
 886
 887 static int cifs_dnotify_thread(void * dummyarg)
 888 {
 889         struct list_head *tmp;
 890         struct cifsSesInfo *ses;
 891
 892         do {
 893                 if (try_to_freeze())
 894                         continue;
 895                 set_current_state(TASK_INTERRUPTIBLE);
 896                 schedule_timeout(15*HZ);
 897                 read_lock(&GlobalSMBSeslock);
 898                 /* check if any stuck requests that need
 899                    to be woken up and wakeq so the
 900                    thread can wake up and error out */
 901                 list_for_each(tmp, &GlobalSMBSessionList) {
 902                         ses = list_entry(tmp, struct cifsSesInfo,
 903                                 cifsSessionList);
 904                         if(ses && ses->server &&
 905                              atomic_read(&ses->server->inFlight))
 906                                 wake_up_all(&ses->server->response_q);
 907                 }
 908                 read_unlock(&GlobalSMBSeslock);
 909         } while (!kthread_should_stop());
 910
 911         return 0;
 912 }
 913
 914 static int __init
 915 init_cifs(void)
 916 {
 917         int rc = 0;
 918 #ifdef CONFIG_PROC_FS
 919         cifs_proc_init();
 920 #endif
 921 /*      INIT_LIST_HEAD(&GlobalServerList);*/    /* BB not implemented yet */
 922         INIT_LIST_HEAD(&GlobalSMBSessionList);
 923         INIT_LIST_HEAD(&GlobalTreeConnectionList);
 924         INIT_LIST_HEAD(&GlobalOplock_Q);
 925 #ifdef CONFIG_CIFS_EXPERIMENTAL
 926         INIT_LIST_HEAD(&GlobalDnotifyReqList);
 927         INIT_LIST_HEAD(&GlobalDnotifyRsp_Q);
 928 #endif
 929 /*
 930  *  Initialize Global counters
 931  */
 932         atomic_set(&sesInfoAllocCount, 0);
 933         atomic_set(&tconInfoAllocCount, 0);
 934         atomic_set(&tcpSesAllocCount,0);
 935         atomic_set(&tcpSesReconnectCount, 0);
 936         atomic_set(&tconInfoReconnectCount, 0);
 937
 938         atomic_set(&bufAllocCount, 0);
 939         atomic_set(&smBufAllocCount, 0);
 940 #ifdef CONFIG_CIFS_STATS2
 941         atomic_set(&totBufAllocCount, 0);
 942         atomic_set(&totSmBufAllocCount, 0);
 943 #endif /* CONFIG_CIFS_STATS2 */
 944
 945         atomic_set(&midCount, 0);
 946         GlobalCurrentXid = 0;
 947         GlobalTotalActiveXid = 0;
 948         GlobalMaxActiveXid = 0;
 949         memset(Local_System_Name, 0, 15);
 950         rwlock_init(&GlobalSMBSeslock);
 951         spin_lock_init(&GlobalMid_Lock);
 952
 953         if(cifs_max_pending < 2) {
 954                 cifs_max_pending = 2;
 955                 cFYI(1,("cifs_max_pending set to min of 2"));
 956         } else if(cifs_max_pending > 256) {
 957                 cifs_max_pending = 256;
 958                 cFYI(1,("cifs_max_pending set to max of 256"));
 959         }
 960
 961         rc = cifs_init_inodecache();
 962         if (rc)
 963                 goto out_clean_proc;
 964
 965         rc = cifs_init_mids();
 966         if (rc)
 967                 goto out_destroy_inodecache;
 968
 969         rc = cifs_init_request_bufs();
 970         if (rc)
 971                 goto out_destroy_mids;
 972
 973         rc = register_filesystem(&cifs_fs_type);
 974         if (rc)
 975                 goto out_destroy_request_bufs;
 976
 977         oplockThread = kthread_run(cifs_oplock_thread, NULL, "cifsoplockd");
 978         if (IS_ERR(oplockThread)) {
 979                 rc = PTR_ERR(oplockThread);
 980                 cERROR(1,("error %d create oplock thread", rc));
 981                 goto out_unregister_filesystem;
 982         }
 983
 984         dnotifyThread = kthread_run(cifs_dnotify_thread, NULL, "cifsdnotifyd");
 985         if (IS_ERR(dnotifyThread)) {
 986                 rc = PTR_ERR(dnotifyThread);
 987                 cERROR(1,("error %d create dnotify thread", rc));
 988                 goto out_stop_oplock_thread;
 989         }
 990
 991         return 0;
 992
 993  out_stop_oplock_thread:
 994         kthread_stop(oplockThread);
 995  out_unregister_filesystem:
 996         unregister_filesystem(&cifs_fs_type);
 997  out_destroy_request_bufs:
 998         cifs_destroy_request_bufs();
 999  out_destroy_mids:
1000         cifs_destroy_mids();
1001  out_destroy_inodecache:
1002         cifs_destroy_inodecache();
1003  out_clean_proc:
1004 #ifdef CONFIG_PROC_FS
1005         cifs_proc_clean();
1006 #endif
1007         return rc;
1008 }
1009
1010 static void __exit
1011 exit_cifs(void)
1012 {
1013         cFYI(0, ("In unregister ie exit_cifs"));
1014 #ifdef CONFIG_PROC_FS
1015         cifs_proc_clean();
1016 #endif
1017         unregister_filesystem(&cifs_fs_type);
1018         cifs_destroy_inodecache();
1019         cifs_destroy_mids();
1020         cifs_destroy_request_bufs();
1021         kthread_stop(oplockThread);
1022         kthread_stop(dnotifyThread);
1023 }
1024
1025 MODULE_AUTHOR("Steve French <sfrench@us.ibm.com>");
1026 MODULE_LICENSE("GPL");          /* combination of LGPL + GPL source behaves as GPL */
1027 MODULE_DESCRIPTION
1028     ("VFS to access servers complying with the SNIA CIFS Specification e.g. Samba and Windows");
1029 MODULE_VERSION(CIFS_VERSION);
1030 module_init(init_cifs)
1031 module_exit(exit_cifs)