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 #include <linux/lustre_build_version.h>
  50
  51 struct semaphore obd_conf_sem;   /* serialize configuration commands */
  52 struct obd_device obd_dev[MAX_OBD_DEVICES];
  53 struct list_head obd_types;
  54 unsigned long obd_memory;
  55
  56 /* The following are visible and mutable through /proc/sys/lustre/. */
  57 unsigned long obd_fail_loc;
  58 unsigned long obd_timeout = 100;
  59 char obd_recovery_upcall[128] = "/usr/lib/lustre/ha_assist";
  60
  61 extern struct obd_type *class_nm_to_type(char *nm);
  62
  63 /*  opening /dev/obd */
  64 static int obd_class_open(struct inode * inode, struct file * file)
  65 {
  66         ENTRY;
  67
  68         file->private_data = NULL;
  69         CDEBUG(D_IOCTL, "MOD_INC_USE for open: count = %d\n",
  70                atomic_read(&(THIS_MODULE)->uc.usecount));
  71         MOD_INC_USE_COUNT;
  72         RETURN(0);
  73 }
  74
  75 /*  closing /dev/obd */
  76 static int obd_class_release(struct inode * inode, struct file * file)
  77 {
  78         ENTRY;
  79
  80         // XXX drop lsm, connections here
  81         if (file->private_data)
  82                 file->private_data = NULL;
  83
  84         CDEBUG(D_IOCTL, "MOD_DEC_USE for close: count = %d\n",
  85                atomic_read(&(THIS_MODULE)->uc.usecount) - 1);
  86         MOD_DEC_USE_COUNT;
  87         RETURN(0);
  88 }
  89
  90 static inline void obd_data2conn(struct lustre_handle *conn,
  91                                  struct obd_ioctl_data *data)
  92 {
  93         conn->addr = data->ioc_addr;
  94         conn->cookie = data->ioc_cookie;
  95 }
  96
  97 static inline void obd_conn2data(struct obd_ioctl_data *data,
  98                                  struct lustre_handle *conn)
  99 {
 100         data->ioc_addr = conn->addr;
 101         data->ioc_cookie = conn->cookie;
 102 }
 103
 104 static void forcibly_detach_exports(struct obd_device *obd)
 105 {
 106         int rc;
 107         struct list_head *tmp, *n;
 108         struct lustre_handle fake_conn;
 109
 110         CDEBUG(D_IOCTL, "OBD device %d (%p) has exports, "
 111                "disconnecting them", obd->obd_minor, obd);
 112         list_for_each_safe(tmp, n, &obd->obd_exports) {
 113                 struct obd_export *exp = list_entry(tmp, struct obd_export,
 114                                                     exp_obd_chain);
 115                 fake_conn.addr = (__u64)(unsigned long)exp;
 116                 fake_conn.cookie = exp->exp_cookie;
 117                 rc = obd_disconnect(&fake_conn);
 118                 if (rc) {
 119                         CDEBUG(D_IOCTL, "disconnecting export %p failed: %d\n",
 120                                exp, rc);
 121                 } else {
 122                         CDEBUG(D_IOCTL, "export %p disconnected\n", exp);
 123                 }
 124         }
 125 }
 126
 127 /* to control /dev/obd */
 128 static int obd_class_ioctl (struct inode * inode, struct file * filp,
 129                             unsigned int cmd, unsigned long arg)
 130 {
 131         char *buf = NULL;
 132         struct obd_ioctl_data *data;
 133         struct obd_device *obd = filp->private_data;
 134         struct lustre_handle conn;
 135         int err = 0, len = 0;
 136         ENTRY;
 137
 138         down(&obd_conf_sem);
 139
 140         if (!obd && cmd != OBD_IOC_DEVICE && cmd != TCGETS &&
 141             cmd != OBD_IOC_LIST && cmd != OBD_GET_VERSION &&
 142             cmd != OBD_IOC_NAME2DEV && cmd != OBD_IOC_NEWDEV) {
 143                 CERROR("OBD ioctl: No device\n");
 144                 GOTO(out, err = -EINVAL);
 145         }
 146         if (obd_ioctl_getdata(&buf, &len, (void *)arg)) {
 147                 CERROR("OBD ioctl: data error\n");
 148                 GOTO(out, err = -EINVAL);
 149         }
 150         data = (struct obd_ioctl_data *)buf;
 151
 152         switch (cmd) {
 153         case TCGETS:
 154                 GOTO(out, err=-EINVAL);
 155         case OBD_IOC_DEVICE: {
 156                 CDEBUG(D_IOCTL, "\n");
 157                 if (data->ioc_dev >= MAX_OBD_DEVICES || data->ioc_dev < 0) {
 158                         CERROR("OBD ioctl: DEVICE insufficient devices\n");
 159                         GOTO(out, err=-EINVAL);
 160                 }
 161                 CDEBUG(D_IOCTL, "device %d\n", data->ioc_dev);
 162
 163                 filp->private_data = &obd_dev[data->ioc_dev];
 164                 GOTO(out, err=0);
 165         }
 166
 167         case OBD_IOC_LIST: {
 168                 int i;
 169                 char *buf2 = data->ioc_bulk;
 170                 int remains = data->ioc_inllen1;
 171
 172                 if (!data->ioc_inlbuf1) {
 173                         CERROR("No buffer passed!\n");
 174                         GOTO(out, err=-EINVAL);
 175                 }
 176
 177
 178                 for (i = 0 ; i < MAX_OBD_DEVICES ; i++) {
 179                         int l;
 180                         char *status;
 181                         struct obd_device *obd = &obd_dev[i];
 182                         if (!obd->obd_type)
 183                                 continue;
 184                         if (obd->obd_flags & OBD_SET_UP)
 185                                 status = "UP";
 186                         else if (obd->obd_flags & OBD_ATTACHED)
 187                                 status = "AT";
 188                         else
 189                                 status = "-";
 190                         l = snprintf(buf2, remains, "%2d %s %s %s %s %d\n",
 191                                      i, status, obd->obd_type->typ_name,
 192                                      obd->obd_name, obd->obd_uuid, obd->obd_type->typ_refcnt);
 193                         buf2 +=l;
 194                         remains -=l;
 195                         if (remains <= 0) {
 196                                 CERROR("not enough space for device listing\n");
 197                                 break;
 198                         }
 199                 }
 200
 201                 err = copy_to_user((void *)arg, data, len);
 202                 if (err)
 203                         err = -EFAULT;
 204                 GOTO(out, err);
 205         }
 206
 207         case OBD_GET_VERSION:
 208                 if (!data->ioc_inlbuf1) {
 209                         CERROR("No buffer passed in ioctl\n");
 210                         GOTO(out, err = -EINVAL);
 211                 }
 212
 213                 if (strlen(BUILD_VERSION) + 1 > data->ioc_inllen1) {
 214                         CERROR("ioctl buffer too small to hold version\n");
 215                         GOTO(out, err = -EINVAL);
 216                 }
 217
 218                 memcpy(data->ioc_bulk, BUILD_VERSION,
 219                        strlen(BUILD_VERSION) + 1);
 220
 221                 err = copy_to_user((void *)arg, data, len);
 222                 if (err)
 223                         err = -EFAULT;
 224                 GOTO(out, err);
 225
 226         case OBD_IOC_NAME2DEV: {
 227                 /* Resolve a device name.  This does not change the
 228                  * currently selected device.
 229                  */
 230                 int dev;
 231
 232                 if (!data->ioc_inllen1 || !data->ioc_inlbuf1 ) {
 233                         CERROR("No name passed,!\n");
 234                         GOTO(out, err=-EINVAL);
 235                 }
 236                 if (data->ioc_inlbuf1[data->ioc_inllen1-1] !=0) {
 237                         CERROR("Name not nul terminated!\n");
 238                         GOTO(out, err=-EINVAL);
 239                 }
 240
 241                 CDEBUG(D_IOCTL, "device name %s\n", data->ioc_inlbuf1);
 242                 dev = class_name2dev(data->ioc_inlbuf1);
 243                 data->ioc_dev = dev;
 244                 if (dev == -1) {
 245                         CDEBUG(D_IOCTL, "No device for name %s!\n",
 246                                data->ioc_inlbuf1);
 247                         GOTO(out, err=-EINVAL);
 248                 }
 249
 250                 CDEBUG(D_IOCTL, "device name %s, dev %d\n", data->ioc_inlbuf1,
 251                        dev);
 252                 err = copy_to_user((void *)arg, data, sizeof(*data));
 253                 if (err)
 254                         err = -EFAULT;
 255                 GOTO(out, err);
 256         }
 257
 258         case OBD_IOC_UUID2DEV: {
 259                 /* Resolve a device uuid.  This does not change the
 260                  * currently selected device.
 261                  */
 262                 int dev;
 263
 264                 if (!data->ioc_inllen1 || !data->ioc_inlbuf1) {
 265                         CERROR("No UUID passed!\n");
 266                         GOTO(out, err=-EINVAL);
 267                 }
 268                 if (data->ioc_inlbuf1[data->ioc_inllen1-1] !=0) {
 269                         CERROR("Name not nul terminated!\n");
 270                         GOTO(out, err=-EINVAL);
 271                 }
 272
 273                 CDEBUG(D_IOCTL, "device name %s\n", data->ioc_inlbuf1);
 274                 dev = class_uuid2dev(data->ioc_inlbuf1);
 275                 data->ioc_dev = dev;
 276                 if (dev == -1) {
 277                         CDEBUG(D_IOCTL, "No device for name %s!\n",
 278                                data->ioc_inlbuf1);
 279                         GOTO(out, err=-EINVAL);
 280                 }
 281
 282                 CDEBUG(D_IOCTL, "device name %s, dev %d\n", data->ioc_inlbuf1,
 283                        dev);
 284                 err = copy_to_user((void *)arg, data, sizeof(*data));
 285                 if (err)
 286                         err = -EFAULT;
 287                 GOTO(out, err);
 288         }
 289
 290         case OBD_IOC_NEWDEV: {
 291                 int dev = -1;
 292                 int i;
 293
 294                 filp->private_data = NULL;
 295                 for (i = 0 ; i < MAX_OBD_DEVICES ; i++) {
 296                         struct obd_device *obd = &obd_dev[i];
 297                         if (!obd->obd_type) {
 298                                 filp->private_data = obd;
 299                                 dev = i;
 300                                 break;
 301                         }
 302                 }
 303
 304
 305                 data->ioc_dev = dev;
 306                 if (dev == -1)
 307                         GOTO(out, err=-EINVAL);
 308
 309                 err = copy_to_user((void *)arg, data, sizeof(*data));
 310                 if (err)
 311                         err = -EFAULT;
 312                 GOTO(out, err);
 313         }
 314
 315         case OBD_IOC_ATTACH: {
 316                 struct obd_type *type;
 317                 int minor;
 318
 319                 /* have we attached a type to this device */
 320                 if (obd->obd_flags & OBD_ATTACHED || obd->obd_type) {
 321                         CERROR("OBD: Device %d already typed as %s.\n",
 322                                obd->obd_minor, MKSTR(obd->obd_type->typ_name));
 323                         GOTO(out, err=-EBUSY);
 324                 }
 325
 326                 if (!data->ioc_inllen1 || !data->ioc_inlbuf1) {
 327                         CERROR("No type passed!\n");
 328                         GOTO(out, err=-EINVAL);
 329                 }
 330                 if (data->ioc_inlbuf1[data->ioc_inllen1-1] !=0) {
 331                         CERROR("Type not nul terminated!\n");
 332                         GOTO(out, err=-EINVAL);
 333                 }
 334
 335                 CDEBUG(D_IOCTL, "attach type %s name: %s uuid: %s\n",
 336                        MKSTR(data->ioc_inlbuf1),
 337                        MKSTR(data->ioc_inlbuf2), MKSTR(data->ioc_inlbuf3));
 338
 339                 /* find the type */
 340                 type = class_nm_to_type(data->ioc_inlbuf1);
 341                 if (!type) {
 342                         CERROR("OBD: unknown type dev %d\n", obd->obd_minor);
 343                         GOTO(out, err=-EINVAL);
 344                 }
 345
 346                 minor = obd->obd_minor;
 347                 memset(obd, 0, sizeof(*obd));
 348                 obd->obd_minor = minor;
 349                 obd->obd_type = type;
 350                 INIT_LIST_HEAD(&obd->obd_exports);
 351                 INIT_LIST_HEAD(&obd->obd_imports);
 352                 spin_lock_init(&obd->obd_dev_lock);
 353
 354                 if (data->ioc_inlbuf2) {
 355                         int len = strlen(data->ioc_inlbuf2) + 1;
 356                         OBD_ALLOC(obd->obd_name, len);
 357                         if (!obd->obd_name) {
 358                                 CERROR("no memory\n");
 359                                 LBUG();
 360                         }
 361                         memcpy(obd->obd_name, data->ioc_inlbuf2, len);
 362                 } else {
 363                         CERROR("WARNING: unnamed obd device\n");
 364                 }
 365                 if (data->ioc_inlbuf3) {
 366                         int len = strlen(data->ioc_inlbuf3);
 367                         if (len >= sizeof(obd->obd_uuid)) {
 368                                 CERROR("uuid must be < %d bytes long\n",
 369                                        sizeof(obd->obd_uuid));
 370                                 if (obd->obd_name)
 371                                         OBD_FREE(obd->obd_name,
 372                                                  strlen(obd->obd_name) + 1);
 373                                 GOTO(out, err=-EINVAL);
 374                         }
 375                         memcpy(obd->obd_uuid, data->ioc_inlbuf3, len);
 376                 }
 377                 /* do the attach */
 378                 if (OBP(obd, attach))
 379                         err = OBP(obd,attach)(obd, sizeof(*data), data);
 380                 if (err) {
 381                         if(data->ioc_inlbuf2)
 382                                 OBD_FREE(obd->obd_name, strlen(obd->obd_name)+1);
 383                         obd->obd_type = NULL;
 384                 } else {
 385                         obd->obd_flags |= OBD_ATTACHED;
 386
 387                         type->typ_refcnt++;
 388                         CDEBUG(D_IOCTL, "OBD: dev %d attached type %s\n",
 389                                obd->obd_minor, data->ioc_inlbuf1);
 390
 391                         CDEBUG(D_IOCTL, "MOD_INC_USE for attach: count = %d\n",
 392                                atomic_read(&(THIS_MODULE)->uc.usecount));
 393                         MOD_INC_USE_COUNT;
 394                 }
 395
 396                 GOTO(out, err);
 397         }
 398
 399         case OBD_IOC_DETACH: {
 400                 ENTRY;
 401                 if (obd->obd_flags & OBD_SET_UP) {
 402                         CERROR("OBD device %d still set up\n", obd->obd_minor);
 403                         GOTO(out, err=-EBUSY);
 404                 }
 405                 if (!(obd->obd_flags & OBD_ATTACHED) ) {
 406                         CERROR("OBD device %d not attached\n", obd->obd_minor);
 407                         GOTO(out, err=-ENODEV);
 408                 }
 409                 if (!list_empty(&obd->obd_exports)) {
 410                         if (!data->ioc_inlbuf1 || data->ioc_inlbuf1[0] != 'F') {
 411                                 CERROR("OBD device %d (%p) has exports\n",
 412                                        obd->obd_minor, obd);
 413                                 GOTO(out, err=-EBUSY);
 414                         }
 415                         forcibly_detach_exports(obd);
 416                 }
 417                    if (OBP(obd, detach))
 418                         err=OBP(obd,detach)(obd);
 419
 420                 if (obd->obd_name) {
 421                         OBD_FREE(obd->obd_name, strlen(obd->obd_name)+1);
 422                         obd->obd_name = NULL;
 423                 }
 424
 425                 obd->obd_flags &= ~OBD_ATTACHED;
 426                 obd->obd_type->typ_refcnt--;
 427                 obd->obd_type = NULL;
 428                 CDEBUG(D_IOCTL, "MOD_DEC_USE for detach: count = %d\n",
 429                        atomic_read(&(THIS_MODULE)->uc.usecount) - 1);
 430                 MOD_DEC_USE_COUNT;
 431                 GOTO(out, err = 0);
 432         }
 433
 434         case OBD_IOC_SETUP: {
 435                 /* have we attached a type to this device? */
 436                 if (!(obd->obd_flags & OBD_ATTACHED)) {
 437                         CERROR("Device %d not attached\n", obd->obd_minor);
 438                         GOTO(out, err=-ENODEV);
 439                 }
 440
 441                 /* has this been done already? */
 442                 if ( obd->obd_flags & OBD_SET_UP ) {
 443                         CERROR("Device %d already setup (type %s)\n",
 444                                obd->obd_minor, obd->obd_type->typ_name);
 445                         GOTO(out, err=-EBUSY);
 446                 }
 447
 448                 if ( OBT(obd) && OBP(obd, setup) )
 449                         err = obd_setup(obd, sizeof(*data), data);
 450
 451                 if (!err) {
 452                         obd->obd_type->typ_refcnt++;
 453                         obd->obd_flags |= OBD_SET_UP;
 454                 }
 455
 456                 GOTO(out, err);
 457         }
 458         case OBD_IOC_CLEANUP: {
 459                 /* have we attached a type to this device? */
 460                 if (!(obd->obd_flags & OBD_ATTACHED)) {
 461                         CERROR("Device %d not attached\n", obd->obd_minor);
 462                         GOTO(out, err=-ENODEV);
 463                 }
 464
 465                 if ( OBT(obd) && OBP(obd, cleanup) )
 466                         err = obd_cleanup(obd);
 467
 468                 if (!err) {
 469                         obd->obd_flags &= ~OBD_SET_UP;
 470                         obd->obd_type->typ_refcnt--;
 471                 }
 472                       GOTO(out, err);
 473         }
 474
 475         case OBD_IOC_CONNECT: {
 476                 char * cluuid = "OBD_CLASS_UUID";
 477                 obd_data2conn(&conn, data);
 478
 479                 err = obd_connect(&conn, obd, cluuid, NULL, NULL);
 480
 481                 CDEBUG(D_IOCTL, "assigned export "LPX64"\n", conn.addr);
 482                 obd_conn2data(data, &conn);
 483                 if (err)
 484                         GOTO(out, err);
 485
 486                 err = copy_to_user((void *)arg, data, sizeof(*data));
 487                 if (err)
 488                         err = -EFAULT;
 489                 // XXX save connection data into file handle
 490                 GOTO(out, err);
 491         }
 492
 493         case OBD_IOC_DISCONNECT: {
 494                 obd_data2conn(&conn, data);
 495                 err = obd_disconnect(&conn);
 496                 GOTO(out, err);
 497         }
 498
 499         case OBD_IOC_DEC_USE_COUNT: {
 500                 CDEBUG(D_IOCTL, "MOD_DEC_USE for force dec: count = %d\n",
 501                        atomic_read(&(THIS_MODULE)->uc.usecount) - 1);
 502                 MOD_DEC_USE_COUNT;
 503                 GOTO(out, err=0);
 504         }
 505
 506         default:
 507                 obd_data2conn(&conn, data);
 508
 509                 err = obd_iocontrol(cmd, &conn, len, data, NULL);
 510                 if (err)
 511                         GOTO(out, err);
 512
 513                 err = copy_to_user((void *)arg, data, len);
 514                 if (err)
 515                         err = -EFAULT;
 516                 GOTO(out, err);
 517         }
 518
 519  out:
 520         if (buf)
 521                 OBD_FREE(buf, len);
 522         up(&obd_conf_sem);
 523         RETURN(err);
 524 } /* obd_class_ioctl */
 525
 526
 527
 528 /* declare character device */
 529 static struct file_operations obd_psdev_fops = {
 530         ioctl: obd_class_ioctl,      /* ioctl */
 531         open: obd_class_open,        /* open */
 532         release: obd_class_release,  /* release */
 533 };
 534
 535 /* modules setup */
 536 #define OBD_MINOR 241
 537 static struct miscdevice obd_psdev = {
 538         OBD_MINOR,
 539         "obd_psdev",
 540         &obd_psdev_fops
 541 };
 542
 543 void (*class_signal_connection_failure)(struct ptlrpc_connection *);
 544
 545 #ifdef CONFIG_HIGHMEM
 546 /* Allow at most 3/4 of the kmap mappings to be consumed by vector I/O
 547  * requests.  This avoids deadlocks on servers which have a lot of clients
 548  * doing vector I/O.  We don't need to do this for non-vector I/O requests
 549  * because singleton requests will just block on the kmap itself and never
 550  * deadlock waiting for additional kmaps to complete.
 551  *
 552  * If we are a "server" task, we can have at most a single reservation
 553  * in excess of the maximum.  This avoids a deadlock when multiple client
 554  * threads are on the same machine as the server threads, and the clients
 555  * have consumed all of the available mappings.  As long as a single server
 556  * thread is can make progress, we are guaranteed to avoid deadlock.
 557  */
 558 #define OBD_KMAP_MAX (LAST_PKMAP * 3 / 4)
 559 static atomic_t obd_kmap_count = ATOMIC_INIT(OBD_KMAP_MAX);
 560 static DECLARE_WAIT_QUEUE_HEAD(obd_kmap_waitq);
 561
 562 void obd_kmap_get(int count, int server)
 563 {
 564         //CERROR("getting %d kmap counts (%d/%d)\n", count,
 565         //       atomic_read(&obd_kmap_count), OBD_KMAP_MAX);
 566         if (count == 1)
 567                 atomic_dec(&obd_kmap_count);
 568         else while (atomic_add_negative(-count, &obd_kmap_count)) {
 569                 static long next_show = 0;
 570                 static int skipped = 0;
 571
 572                 if (server && atomic_read(&obd_kmap_count) >= -PTL_MD_MAX_IOV)
 573                         break;
 574
 575                 CDEBUG(D_OTHER, "negative kmap reserved count: %d\n",
 576                        atomic_read(&obd_kmap_count));
 577                 atomic_add(count, &obd_kmap_count);
 578
 579                 if (time_after(jiffies, next_show)) {
 580                         CERROR("blocking %s (and %d others) for kmaps\n",
 581                                current->comm, skipped);
 582                         next_show = jiffies + 5*HZ;
 583                         skipped = 0;
 584                 } else
 585                         skipped++;
 586                 wait_event(obd_kmap_waitq,
 587                            atomic_read(&obd_kmap_count) >= count);
 588         }
 589 }
 590
 591 void obd_kmap_put(int count)
 592 {
 593         atomic_add(count, &obd_kmap_count);
 594         /* Wake up sleepers.  Sadly, this wakes up all of the tasks at once.
 595          * We could have something smarter here like:
 596         while (atomic_read(&obd_kmap_count) > 0)
 597                 wake_up_nr(obd_kmap_waitq, 1);
 598         although we would need to set somewhere (probably obd_class_init):
 599         obd_kmap_waitq.flags |= WQ_FLAG_EXCLUSIVE;
 600         For now the wait_event() condition will handle this OK I believe.
 601          */
 602         if (atomic_read(&obd_kmap_count) > 0)
 603                 wake_up(&obd_kmap_waitq);
 604 }
 605
 606 EXPORT_SYMBOL(obd_kmap_get);
 607 EXPORT_SYMBOL(obd_kmap_put);
 608 #endif
 609
 610 EXPORT_SYMBOL(obd_dev);
 611 EXPORT_SYMBOL(obdo_cachep);
 612 EXPORT_SYMBOL(obd_memory);
 613 EXPORT_SYMBOL(obd_fail_loc);
 614 EXPORT_SYMBOL(obd_timeout);
 615 EXPORT_SYMBOL(obd_recovery_upcall);
 616 EXPORT_SYMBOL(ptlrpc_put_connection_superhack);
 617
 618 EXPORT_SYMBOL(class_register_type);
 619 EXPORT_SYMBOL(class_unregister_type);
 620 EXPORT_SYMBOL(class_name2dev);
 621 EXPORT_SYMBOL(class_uuid2dev);
 622 EXPORT_SYMBOL(class_uuid2obd);
 623 EXPORT_SYMBOL(class_new_export);
 624 EXPORT_SYMBOL(class_destroy_export);
 625 EXPORT_SYMBOL(class_connect);
 626 EXPORT_SYMBOL(class_conn2export);
 627 EXPORT_SYMBOL(class_conn2obd);
 628 EXPORT_SYMBOL(class_conn2cliimp);
 629 EXPORT_SYMBOL(class_conn2ldlmimp);
 630 EXPORT_SYMBOL(class_disconnect);
 631 EXPORT_SYMBOL(class_disconnect_all);
 632 EXPORT_SYMBOL(class_uuid_unparse);
 633
 634 EXPORT_SYMBOL(class_signal_connection_failure);
 635 EXPORT_SYMBOL(class_nm_to_type);
 636
 637 static int __init init_obdclass(void)
 638 {
 639         struct obd_device *obd;
 640         int err;
 641         int i;
 642
 643         printk(KERN_INFO "OBD class driver Build Version: " BUILD_VERSION
 644                       ", info@clusterfs.com\n");
 645
 646         sema_init(&obd_conf_sem, 1);
 647         INIT_LIST_HEAD(&obd_types);
 648
 649         if ((err = misc_register(&obd_psdev))) {
 650                 CERROR("cannot register %d err %d\n", OBD_MINOR, err);
 651                 return err;
 652         }
 653
 654         /* This struct is already zerod for us (static global) */
 655         for (i = 0, obd = obd_dev; i < MAX_OBD_DEVICES; i++, obd++)
 656                 obd->obd_minor = i;
 657
 658         err = obd_init_caches();
 659
 660         if (err)
 661                 return err;
 662         obd_sysctl_init();
 663
 664         err = lprocfs_reg_main();
 665
 666         return 0;
 667 }
 668
 669 static void __exit cleanup_obdclass(void)
 670 {
 671         int i, err;
 672         ENTRY;
 673
 674         misc_deregister(&obd_psdev);
 675         for (i = 0; i < MAX_OBD_DEVICES; i++) {
 676                 struct obd_device *obd = &obd_dev[i];
 677                 if (obd->obd_type && (obd->obd_flags & OBD_SET_UP) &&
 678                     OBT(obd) && OBP(obd, detach)) {
 679                         /* XXX should this call generic detach otherwise? */
 680                         OBP(obd, detach)(obd);
 681                 }
 682         }
 683
 684         obd_cleanup_caches();
 685         obd_sysctl_clean();
 686
 687         err = lprocfs_dereg_main();
 688
 689         CERROR("obd memory leaked: %ld bytes\n", obd_memory);
 690         EXIT;
 691 }
 692
 693 /* Check that we're building against the appropriate version of the Lustre
 694  * kernel patch */
 695 #include <linux/lustre_version.h>
 696 #if (LUSTRE_KERNEL_VERSION != 3)
 697 # error Cannot continue: Your Lustre kernel patch is out of date
 698 #endif
 699
 700 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 701 MODULE_DESCRIPTION("Lustre Class Driver Build Version: " BUILD_VERSION);
 702 MODULE_LICENSE("GPL");
 703
 704 module_init(init_obdclass);
 705 module_exit(cleanup_obdclass);