lustre/obdclass/class_obd.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * Copyright (C) 2001, 2002 Cluster File Systems, Inc.
   5  *
   6  * This code is issued under the GNU General Public License.
   7  * See the file COPYING in this distribution
   8  *
   9  * These are the only exported functions, they provide some generic
  10  * infrastructure for managing object devices
  11  *
  12  * Object Devices Class Driver
  13  */
  14
  15 #define EXPORT_SYMTAB
  16 #include <linux/config.h> /* for CONFIG_PROC_FS */
  17 #include <linux/module.h>
  18 #include <linux/errno.h>
  19 #include <linux/kernel.h>
  20 #include <linux/major.h>
  21 #include <linux/sched.h>
  22 #include <linux/lp.h>
  23 #include <linux/slab.h>
  24 #include <linux/ioport.h>
  25 #include <linux/fcntl.h>
  26 #include <linux/delay.h>
  27 #include <linux/skbuff.h>
  28 #include <linux/proc_fs.h>
  29 #include <linux/fs.h>
  30 #include <linux/poll.h>
  31 #include <linux/init.h>
  32 #include <linux/list.h>
  33 #include <linux/highmem.h>
  34 #include <asm/io.h>
  35 #include <asm/ioctls.h>
  36 #include <asm/system.h>
  37 #include <asm/poll.h>
  38 #include <asm/uaccess.h>
  39 #include <linux/miscdevice.h>
  40
  41 #define DEBUG_SUBSYSTEM S_CLASS
  42
  43 #include <linux/obd_support.h>
  44 #include <linux/obd_class.h>
  45 #include <linux/lustre_debug.h>
  46 #include <linux/smp_lock.h>
  47 #include <linux/lprocfs_status.h>
  48 #include <portals/lib-types.h> /* for PTL_MD_MAX_IOV */
  49
  50 struct semaphore obd_conf_sem;   /* serialize configuration commands */
  51 struct obd_device obd_dev[MAX_OBD_DEVICES];
  52 struct list_head obd_types;
  53 unsigned long obd_memory;
  54
  55 /* The following are visible and mutable through /proc/sys/lustre/. */
  56 unsigned long obd_fail_loc;
  57 unsigned long obd_timeout = 100;
  58 char obd_recovery_upcall[128] = "/usr/lib/lustre/ha_assist";
  59
  60 extern struct obd_type *class_nm_to_type(char *nm);
  61
  62 /*  opening /dev/obd */
  63 static int obd_class_open(struct inode * inode, struct file * file)
  64 {
  65         ENTRY;
  66
  67         file->private_data = NULL;
  68         CDEBUG(D_IOCTL, "MOD_INC_USE for open: count = %d\n",
  69                atomic_read(&(THIS_MODULE)->uc.usecount));
  70         MOD_INC_USE_COUNT;
  71         RETURN(0);
  72 }
  73
  74 /*  closing /dev/obd */
  75 static int obd_class_release(struct inode * inode, struct file * file)
  76 {
  77         ENTRY;
  78
  79         // XXX drop lsm, connections here
  80         if (file->private_data)
  81                 file->private_data = NULL;
  82
  83         CDEBUG(D_IOCTL, "MOD_DEC_USE for close: count = %d\n",
  84                atomic_read(&(THIS_MODULE)->uc.usecount) - 1);
  85         MOD_DEC_USE_COUNT;
  86         RETURN(0);
  87 }
  88
  89 static inline void obd_data2conn(struct lustre_handle *conn,
  90                                  struct obd_ioctl_data *data)
  91 {
  92         conn->addr = data->ioc_addr;
  93         conn->cookie = data->ioc_cookie;
  94 }
  95
  96 static inline void obd_conn2data(struct obd_ioctl_data *data,
  97                                  struct lustre_handle *conn)
  98 {
  99         data->ioc_addr = conn->addr;
 100         data->ioc_cookie = conn->cookie;
 101 }
 102
 103 static void forcibly_detach_exports(struct obd_device *obd)
 104 {
 105         int rc;
 106         struct list_head *tmp, *n;
 107         struct lustre_handle fake_conn;
 108
 109         CDEBUG(D_IOCTL, "OBD device %d (%p) has exports, "
 110                "disconnecting them", obd->obd_minor, obd);
 111         list_for_each_safe(tmp, n, &obd->obd_exports) {
 112                 struct obd_export *exp = list_entry(tmp, struct obd_export,
 113                                                     exp_obd_chain);
 114                 fake_conn.addr = (__u64)(unsigned long)exp;
 115                 fake_conn.cookie = exp->exp_cookie;
 116                 rc = obd_disconnect(&fake_conn);
 117                 if (rc) {
 118                         CDEBUG(D_IOCTL, "disconnecting export %p failed: %d\n",
 119                                exp, rc);
 120                 } else {
 121                         CDEBUG(D_IOCTL, "export %p disconnected\n", exp);
 122                 }
 123         }
 124 }
 125
 126 /* to control /dev/obd */
 127 static int obd_class_ioctl (struct inode * inode, struct file * filp,
 128                             unsigned int cmd, unsigned long arg)
 129 {
 130         char *buf = NULL;
 131         struct obd_ioctl_data *data;
 132         struct obd_device *obd = filp->private_data;
 133         struct lustre_handle conn;
 134         int err = 0, len = 0;
 135         ENTRY;
 136
 137         down(&obd_conf_sem);
 138
 139         if (!obd && cmd != OBD_IOC_DEVICE && cmd != TCGETS &&
 140             cmd != OBD_IOC_LIST &&
 141             cmd != OBD_IOC_NAME2DEV && cmd != OBD_IOC_NEWDEV) {
 142                 CERROR("OBD ioctl: No device\n");
 143                 GOTO(out, err = -EINVAL);
 144         }
 145         if (obd_ioctl_getdata(&buf, &len, (void *)arg)) {
 146                 CERROR("OBD ioctl: data error\n");
 147                 GOTO(out, err = -EINVAL);
 148         }
 149         data = (struct obd_ioctl_data *)buf;
 150
 151         switch (cmd) {
 152         case TCGETS:
 153                 GOTO(out, err=-EINVAL);
 154         case OBD_IOC_DEVICE: {
 155                 CDEBUG(D_IOCTL, "\n");
 156                 if (data->ioc_dev >= MAX_OBD_DEVICES || data->ioc_dev < 0) {
 157                         CERROR("OBD ioctl: DEVICE insufficient devices\n");
 158                         GOTO(out, err=-EINVAL);
 159                 }
 160                 CDEBUG(D_IOCTL, "device %d\n", data->ioc_dev);
 161
 162                 filp->private_data = &obd_dev[data->ioc_dev];
 163                 GOTO(out, err=0);
 164         }
 165
 166         case OBD_IOC_LIST: {
 167                 int i;
 168                 char *buf2 = data->ioc_bulk;
 169                 int remains = data->ioc_inllen1;
 170
 171                 if (!data->ioc_inlbuf1) {
 172                         CERROR("No buffer passed!\n");
 173                         GOTO(out, err=-EINVAL);
 174                 }
 175
 176
 177                 for (i = 0 ; i < MAX_OBD_DEVICES ; i++) {
 178                         int l;
 179                         char *status;
 180                         struct obd_device *obd = &obd_dev[i];
 181                         if (!obd->obd_type)
 182                                 continue;
 183                         if (obd->obd_flags & OBD_SET_UP)
 184                                 status = "UP";
 185                         else if (obd->obd_flags & OBD_ATTACHED)
 186                                 status = "AT";
 187                         else
 188                                 status = "-";
 189                         l = snprintf(buf2, remains, "%2d %s %s %s %s %d\n",
 190                                      i, status, obd->obd_type->typ_name,
 191                                      obd->obd_name, obd->obd_uuid, obd->obd_type->typ_refcnt);
 192                         buf2 +=l;
 193                         remains -=l;
 194                         if (remains <= 0) {
 195                                 CERROR("not enough space for device listing\n");
 196                                 break;
 197                         }
 198                 }
 199
 200                 err = copy_to_user((void *)arg, data, len);
 201                 if (err)
 202                         err = -EFAULT;
 203                 GOTO(out, err);
 204         }
 205
 206
 207         case OBD_IOC_NAME2DEV: {
 208                 /* Resolve a device name.  This does not change the
 209                  * currently selected device.
 210                  */
 211                 int dev;
 212
 213                 if (!data->ioc_inllen1 || !data->ioc_inlbuf1 ) {
 214                         CERROR("No name passed,!\n");
 215                         GOTO(out, err=-EINVAL);
 216                 }
 217                 if (data->ioc_inlbuf1[data->ioc_inllen1-1] !=0) {
 218                         CERROR("Name not nul terminated!\n");
 219                         GOTO(out, err=-EINVAL);
 220                 }
 221
 222                 CDEBUG(D_IOCTL, "device name %s\n", data->ioc_inlbuf1);
 223                 dev = class_name2dev(data->ioc_inlbuf1);
 224                 data->ioc_dev = dev;
 225                 if (dev == -1) {
 226                         CDEBUG(D_IOCTL, "No device for name %s!\n",
 227                                data->ioc_inlbuf1);
 228                         GOTO(out, err=-EINVAL);
 229                 }
 230
 231                 CDEBUG(D_IOCTL, "device name %s, dev %d\n", data->ioc_inlbuf1,
 232                        dev);
 233                 err = copy_to_user((void *)arg, data, sizeof(*data));
 234                 if (err)
 235                         err = -EFAULT;
 236                 GOTO(out, err);
 237         }
 238
 239         case OBD_IOC_UUID2DEV: {
 240                 /* Resolve a device uuid.  This does not change the
 241                  * currently selected device.
 242                  */
 243                 int dev;
 244
 245                 if (!data->ioc_inllen1 || !data->ioc_inlbuf1) {
 246                         CERROR("No UUID passed!\n");
 247                         GOTO(out, err=-EINVAL);
 248                 }
 249                 if (data->ioc_inlbuf1[data->ioc_inllen1-1] !=0) {
 250                         CERROR("Name not nul terminated!\n");
 251                         GOTO(out, err=-EINVAL);
 252                 }
 253
 254                 CDEBUG(D_IOCTL, "device name %s\n", data->ioc_inlbuf1);
 255                 dev = class_uuid2dev(data->ioc_inlbuf1);
 256                 data->ioc_dev = dev;
 257                 if (dev == -1) {
 258                         CDEBUG(D_IOCTL, "No device for name %s!\n",
 259                                data->ioc_inlbuf1);
 260                         GOTO(out, err=-EINVAL);
 261                 }
 262
 263                 CDEBUG(D_IOCTL, "device name %s, dev %d\n", data->ioc_inlbuf1,
 264                        dev);
 265                 err = copy_to_user((void *)arg, data, sizeof(*data));
 266                 if (err)
 267                         err = -EFAULT;
 268                 GOTO(out, err);
 269         }
 270
 271         case OBD_IOC_NEWDEV: {
 272                 int dev = -1;
 273                 int i;
 274
 275                 filp->private_data = NULL;
 276                 for (i = 0 ; i < MAX_OBD_DEVICES ; i++) {
 277                         struct obd_device *obd = &obd_dev[i];
 278                         if (!obd->obd_type) {
 279                                 filp->private_data = obd;
 280                                 dev = i;
 281                                 break;
 282                         }
 283                 }
 284
 285
 286                 data->ioc_dev = dev;
 287                 if (dev == -1)
 288                         GOTO(out, err=-EINVAL);
 289
 290                 err = copy_to_user((void *)arg, data, sizeof(*data));
 291                 if (err)
 292                         err = -EFAULT;
 293                 GOTO(out, err);
 294         }
 295
 296         case OBD_IOC_ATTACH: {
 297                 struct obd_type *type;
 298                 int minor;
 299
 300                 /* have we attached a type to this device */
 301                 if (obd->obd_flags & OBD_ATTACHED || obd->obd_type) {
 302                         CERROR("OBD: Device %d already typed as %s.\n",
 303                                obd->obd_minor, MKSTR(obd->obd_type->typ_name));
 304                         GOTO(out, err=-EBUSY);
 305                 }
 306
 307                 if (!data->ioc_inllen1 || !data->ioc_inlbuf1) {
 308                         CERROR("No type passed!\n");
 309                         GOTO(out, err=-EINVAL);
 310                 }
 311                 if (data->ioc_inlbuf1[data->ioc_inllen1-1] !=0) {
 312                         CERROR("Type not nul terminated!\n");
 313                         GOTO(out, err=-EINVAL);
 314                 }
 315
 316                 CDEBUG(D_IOCTL, "attach type %s name: %s uuid: %s\n",
 317                        MKSTR(data->ioc_inlbuf1),
 318                        MKSTR(data->ioc_inlbuf2), MKSTR(data->ioc_inlbuf3));
 319
 320                 /* find the type */
 321                 type = class_nm_to_type(data->ioc_inlbuf1);
 322                 if (!type) {
 323                         CERROR("OBD: unknown type dev %d\n", obd->obd_minor);
 324                         GOTO(out, err=-EINVAL);
 325                 }
 326
 327                 minor = obd->obd_minor;
 328                 memset(obd, 0, sizeof(*obd));
 329                 obd->obd_minor = minor;
 330                 obd->obd_type = type;
 331                 INIT_LIST_HEAD(&obd->obd_exports);
 332                 INIT_LIST_HEAD(&obd->obd_imports);
 333                 spin_lock_init(&obd->obd_dev_lock);
 334
 335                         if (data->ioc_inlbuf2) {
 336                                 int len = strlen(data->ioc_inlbuf2) + 1;
 337                                 OBD_ALLOC(obd->obd_name, len);
 338                                 if (!obd->obd_name) {
 339                                         CERROR("no memory\n");
 340                                         LBUG();
 341                                 }
 342                                 memcpy(obd->obd_name, data->ioc_inlbuf2, len);
 343                         } else {
 344                                 CERROR("WARNING: unnamed obd device\n");
 345                         }
 346                         if (data->ioc_inlbuf3) {
 347                                 int len = strlen(data->ioc_inlbuf3);
 348                                 if (len >= sizeof(obd->obd_uuid)) {
 349                                         CERROR("uuid must be < %d bytes long\n",
 350                                                sizeof(obd->obd_uuid));
 351                                         if (obd->obd_name)
 352                                                 OBD_FREE(obd->obd_name,
 353                                                          strlen(obd->obd_name) + 1);
 354                                         GOTO(out, err=-EINVAL);
 355                                 }
 356                                 memcpy(obd->obd_uuid, data->ioc_inlbuf3, len);
 357                         }
 358                 /* do the attach */
 359                 if (OBP(obd, attach))
 360                         err = OBP(obd,attach)(obd, sizeof(*data), data);
 361                 if (err) {
 362                         if(data->ioc_inlbuf2)
 363                                 OBD_FREE(obd->obd_name, strlen(obd->obd_name)+1);
 364                         obd->obd_type = NULL;
 365                 } else {
 366                         obd->obd_flags |= OBD_ATTACHED;
 367
 368                         type->typ_refcnt++;
 369                         CDEBUG(D_IOCTL, "OBD: dev %d attached type %s\n",
 370                                obd->obd_minor, data->ioc_inlbuf1);
 371
 372                         CDEBUG(D_IOCTL, "MOD_INC_USE for attach: count = %d\n",
 373                                atomic_read(&(THIS_MODULE)->uc.usecount));
 374                         MOD_INC_USE_COUNT;
 375                 }
 376
 377                 GOTO(out, err);
 378         }
 379
 380         case OBD_IOC_DETACH: {
 381                 ENTRY;
 382                 if (obd->obd_flags & OBD_SET_UP) {
 383                         CERROR("OBD device %d still set up\n", obd->obd_minor);
 384                         GOTO(out, err=-EBUSY);
 385                 }
 386                 if (!(obd->obd_flags & OBD_ATTACHED) ) {
 387                         CERROR("OBD device %d not attached\n", obd->obd_minor);
 388                         GOTO(out, err=-ENODEV);
 389                 }
 390                 if (!list_empty(&obd->obd_exports)) {
 391                         if (!data->ioc_inlbuf1 || data->ioc_inlbuf1[0] != 'F') {
 392                                 CERROR("OBD device %d (%p) has exports\n",
 393                                        obd->obd_minor, obd);
 394                                 GOTO(out, err=-EBUSY);
 395                         }
 396                         forcibly_detach_exports(obd);
 397                 }
 398                    if (OBP(obd, detach))
 399                         err=OBP(obd,detach)(obd);
 400
 401                 if (obd->obd_name) {
 402                         OBD_FREE(obd->obd_name, strlen(obd->obd_name)+1);
 403                         obd->obd_name = NULL;
 404                 }
 405
 406                 obd->obd_flags &= ~OBD_ATTACHED;
 407                 obd->obd_type->typ_refcnt--;
 408                 obd->obd_type = NULL;
 409                 CDEBUG(D_IOCTL, "MOD_DEC_USE for detach: count = %d\n",
 410                        atomic_read(&(THIS_MODULE)->uc.usecount) - 1);
 411                 MOD_DEC_USE_COUNT;
 412                 GOTO(out, err = 0);
 413         }
 414
 415         case OBD_IOC_SETUP: {
 416                 /* have we attached a type to this device? */
 417                 if (!(obd->obd_flags & OBD_ATTACHED)) {
 418                         CERROR("Device %d not attached\n", obd->obd_minor);
 419                         GOTO(out, err=-ENODEV);
 420                 }
 421
 422                 /* has this been done already? */
 423                 if ( obd->obd_flags & OBD_SET_UP ) {
 424                         CERROR("Device %d already setup (type %s)\n",
 425                                obd->obd_minor, obd->obd_type->typ_name);
 426                         GOTO(out, err=-EBUSY);
 427                 }
 428
 429                 if ( OBT(obd) && OBP(obd, setup) )
 430                         err = obd_setup(obd, sizeof(*data), data);
 431
 432                 if (!err) {
 433                         obd->obd_type->typ_refcnt++;
 434                         obd->obd_flags |= OBD_SET_UP;
 435                 }
 436
 437                 GOTO(out, err);
 438         }
 439         case OBD_IOC_CLEANUP: {
 440                 /* have we attached a type to this device? */
 441                 if (!(obd->obd_flags & OBD_ATTACHED)) {
 442                         CERROR("Device %d not attached\n", obd->obd_minor);
 443                         GOTO(out, err=-ENODEV);
 444                 }
 445
 446                 if ( OBT(obd) && OBP(obd, cleanup) )
 447                         err = obd_cleanup(obd);
 448
 449                 if (!err) {
 450                         obd->obd_flags &= ~OBD_SET_UP;
 451                         obd->obd_type->typ_refcnt--;
 452                 }
 453                 GOTO(out, err);
 454         }
 455
 456         case OBD_IOC_CONNECT: {
 457                 char * cluuid = "OBD_CLASS_UUID";
 458                 obd_data2conn(&conn, data);
 459
 460                 err = obd_connect(&conn, obd, cluuid, NULL, NULL);
 461
 462                 CDEBUG(D_IOCTL, "assigned export "LPX64"\n", conn.addr);
 463                 obd_conn2data(data, &conn);
 464                 if (err)
 465                         GOTO(out, err);
 466
 467                 err = copy_to_user((void *)arg, data, sizeof(*data));
 468                 if (err)
 469                         err = -EFAULT;
 470                 // XXX save connection data into file handle
 471                 GOTO(out, err);
 472         }
 473
 474         case OBD_IOC_DISCONNECT: {
 475                 obd_data2conn(&conn, data);
 476                 err = obd_disconnect(&conn);
 477                 GOTO(out, err);
 478         }
 479
 480         case OBD_IOC_DEC_USE_COUNT: {
 481                 CDEBUG(D_IOCTL, "MOD_DEC_USE for force dec: count = %d\n",
 482                        atomic_read(&(THIS_MODULE)->uc.usecount) - 1);
 483                 MOD_DEC_USE_COUNT;
 484                 GOTO(out, err=0);
 485         }
 486
 487         default:
 488                 obd_data2conn(&conn, data);
 489
 490                 err = obd_iocontrol(cmd, &conn, len, data, NULL);
 491                 if (err)
 492                         GOTO(out, err);
 493
 494                 err = copy_to_user((void *)arg, data, len);
 495                 if (err)
 496                         err = -EFAULT;
 497                 GOTO(out, err);
 498         }
 499
 500  out:
 501         if (buf)
 502                 OBD_FREE(buf, len);
 503         up(&obd_conf_sem);
 504         RETURN(err);
 505 } /* obd_class_ioctl */
 506
 507
 508
 509 /* declare character device */
 510 static struct file_operations obd_psdev_fops = {
 511         ioctl: obd_class_ioctl,      /* ioctl */
 512         open: obd_class_open,        /* open */
 513         release: obd_class_release,  /* release */
 514 };
 515
 516 /* modules setup */
 517 #define OBD_MINOR 241
 518 static struct miscdevice obd_psdev = {
 519         OBD_MINOR,
 520         "obd_psdev",
 521         &obd_psdev_fops
 522 };
 523
 524 void (*class_signal_connection_failure)(struct ptlrpc_connection *);
 525
 526 #ifdef CONFIG_HIGHMEM
 527 /* Allow at most 3/4 of the kmap mappings to be consumed by vector I/O
 528  * requests.  This avoids deadlocks on servers which have a lot of clients
 529  * doing vector I/O.  We don't need to do this for non-vector I/O requests
 530  * because singleton requests will just block on the kmap itself and never
 531  * deadlock waiting for additional kmaps to complete.
 532  *
 533  * If we are a "server" task, we can have at most a single reservation
 534  * in excess of the maximum.  This avoids a deadlock when multiple client
 535  * threads are on the same machine as the server threads, and the clients
 536  * have consumed all of the available mappings.  As long as a single server
 537  * thread is can make progress, we are guaranteed to avoid deadlock.
 538  */
 539 #define OBD_KMAP_MAX (LAST_PKMAP * 3 / 4)
 540 static atomic_t obd_kmap_count = ATOMIC_INIT(OBD_KMAP_MAX);
 541 static DECLARE_WAIT_QUEUE_HEAD(obd_kmap_waitq);
 542
 543 void obd_kmap_get(int count, int server)
 544 {
 545         //CERROR("getting %d kmap counts (%d/%d)\n", count,
 546         //       atomic_read(&obd_kmap_count), OBD_KMAP_MAX);
 547         if (count == 1)
 548                 atomic_dec(&obd_kmap_count);
 549         else while (atomic_add_negative(-count, &obd_kmap_count)) {
 550                 static long next_show = 0;
 551                 static int skipped = 0;
 552
 553                 if (server && atomic_read(&obd_kmap_count) >= -PTL_MD_MAX_IOV)
 554                         break;
 555
 556                 CDEBUG(D_OTHER, "negative kmap reserved count: %d\n",
 557                        atomic_read(&obd_kmap_count));
 558                 atomic_add(count, &obd_kmap_count);
 559
 560                 if (time_after(jiffies, next_show)) {
 561                         CERROR("blocking %s (and %d others) for kmaps\n",
 562                                current->comm, skipped);
 563                         next_show = jiffies + 5*HZ;
 564                         skipped = 0;
 565                 } else
 566                         skipped++;
 567                 wait_event(obd_kmap_waitq,
 568                            atomic_read(&obd_kmap_count) >= count);
 569         }
 570 }
 571
 572 void obd_kmap_put(int count)
 573 {
 574         atomic_add(count, &obd_kmap_count);
 575         /* Wake up sleepers.  Sadly, this wakes up all of the tasks at once.
 576          * We could have something smarter here like:
 577         while (atomic_read(&obd_kmap_count) > 0)
 578                 wake_up_nr(obd_kmap_waitq, 1);
 579         although we would need to set somewhere (probably obd_class_init):
 580         obd_kmap_waitq.flags |= WQ_FLAG_EXCLUSIVE;
 581         For now the wait_event() condition will handle this OK I believe.
 582          */
 583         if (atomic_read(&obd_kmap_count) > 0)
 584                 wake_up(&obd_kmap_waitq);
 585 }
 586
 587 EXPORT_SYMBOL(obd_kmap_get);
 588 EXPORT_SYMBOL(obd_kmap_put);
 589 #endif
 590
 591 EXPORT_SYMBOL(obd_dev);
 592 EXPORT_SYMBOL(obdo_cachep);
 593 EXPORT_SYMBOL(obd_memory);
 594 EXPORT_SYMBOL(obd_fail_loc);
 595 EXPORT_SYMBOL(obd_timeout);
 596 EXPORT_SYMBOL(obd_recovery_upcall);
 597 EXPORT_SYMBOL(ptlrpc_put_connection_superhack);
 598
 599 EXPORT_SYMBOL(class_register_type);
 600 EXPORT_SYMBOL(class_unregister_type);
 601 EXPORT_SYMBOL(class_name2dev);
 602 EXPORT_SYMBOL(class_uuid2dev);
 603 EXPORT_SYMBOL(class_uuid2obd);
 604 EXPORT_SYMBOL(class_new_export);
 605 EXPORT_SYMBOL(class_destroy_export);
 606 EXPORT_SYMBOL(class_connect);
 607 EXPORT_SYMBOL(class_conn2export);
 608 EXPORT_SYMBOL(class_conn2obd);
 609 EXPORT_SYMBOL(class_conn2cliimp);
 610 EXPORT_SYMBOL(class_conn2ldlmimp);
 611 EXPORT_SYMBOL(class_disconnect);
 612 EXPORT_SYMBOL(class_disconnect_all);
 613 EXPORT_SYMBOL(class_uuid_unparse);
 614
 615 EXPORT_SYMBOL(class_signal_connection_failure);
 616 EXPORT_SYMBOL(class_nm_to_type);
 617
 618 static int __init init_obdclass(void)
 619 {
 620         struct obd_device *obd;
 621         int err;
 622         int i;
 623
 624         printk(KERN_INFO "OBD class driver  v0.9, info@clusterfs.com\n");
 625
 626         sema_init(&obd_conf_sem, 1);
 627         INIT_LIST_HEAD(&obd_types);
 628
 629         if ((err = misc_register(&obd_psdev))) {
 630                 CERROR("cannot register %d err %d\n", OBD_MINOR, err);
 631                 return err;
 632         }
 633
 634         /* This struct is already zerod for us (static global) */
 635         for (i = 0, obd = obd_dev; i < MAX_OBD_DEVICES; i++, obd++)
 636                 obd->obd_minor = i;
 637
 638         err = obd_init_caches();
 639
 640         if (err)
 641                 return err;
 642         obd_sysctl_init();
 643
 644         err = lprocfs_reg_main();
 645
 646         return 0;
 647 }
 648
 649 static void __exit cleanup_obdclass(void)
 650 {
 651         int i, err;
 652         ENTRY;
 653
 654         misc_deregister(&obd_psdev);
 655         for (i = 0; i < MAX_OBD_DEVICES; i++) {
 656                 struct obd_device *obd = &obd_dev[i];
 657                 if (obd->obd_type && (obd->obd_flags & OBD_SET_UP) &&
 658                     OBT(obd) && OBP(obd, detach)) {
 659                         /* XXX should this call generic detach otherwise? */
 660                         OBP(obd, detach)(obd);
 661                 }
 662         }
 663
 664         obd_cleanup_caches();
 665         obd_sysctl_clean();
 666
 667         err = lprocfs_dereg_main();
 668
 669         CERROR("obd memory leaked: %ld bytes\n", obd_memory);
 670         EXIT;
 671 }
 672
 673 /* Check that we're building against the appropriate version of the Lustre
 674  * kernel patch */
 675 #include <linux/lustre_version.h>
 676 #if (LUSTRE_KERNEL_VERSION != 2)
 677 # error Cannot continue: Your Lustre kernel patch is out of date
 678 #endif
 679
 680 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 681 MODULE_DESCRIPTION("Lustre Class Driver v1.0");
 682 MODULE_LICENSE("GPL");
 683
 684 module_init(init_obdclass);
 685 module_exit(cleanup_obdclass);