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  * Object Devices Class Driver
   5  *
   6  *  Copyright (C) 2001-2003 Cluster File Systems, Inc.
   7  *
   8  *   This file is part of Lustre, http://www.lustre.org.
   9  *
  10  *   Lustre is free software; you can redistribute it and/or
  11  *   modify it under the terms of version 2 of the GNU General Public
  12  *   License as published by the Free Software Foundation.
  13  *
  14  *   Lustre 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 the
  17  *   GNU General Public License for more details.
  18  *
  19  *   You should have received a copy of the GNU General Public License
  20  *   along with Lustre; if not, write to the Free Software
  21  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  *
  23  * These are the only exported functions, they provide some generic
  24  * infrastructure for managing object devices
  25  */
  26
  27 #define DEBUG_SUBSYSTEM S_CLASS
  28 #define EXPORT_SYMTAB
  29 #ifdef __KERNEL__
  30 #include <linux/config.h> /* for CONFIG_PROC_FS */
  31 #include <linux/module.h>
  32 #include <linux/errno.h>
  33 #include <linux/kernel.h>
  34 #include <linux/major.h>
  35 #include <linux/sched.h>
  36 #include <linux/lp.h>
  37 #include <linux/slab.h>
  38 #include <linux/ioport.h>
  39 #include <linux/fcntl.h>
  40 #include <linux/delay.h>
  41 #include <linux/skbuff.h>
  42 #include <linux/proc_fs.h>
  43 #include <linux/fs.h>
  44 #include <linux/poll.h>
  45 #include <linux/init.h>
  46 #include <linux/list.h>
  47 #include <linux/highmem.h>
  48 #include <asm/io.h>
  49 #include <asm/ioctls.h>
  50 #include <asm/system.h>
  51 #include <asm/poll.h>
  52 #include <asm/uaccess.h>
  53 #include <linux/miscdevice.h>
  54 #include <linux/smp_lock.h>
  55 #else
  56
  57 # include <liblustre.h>
  58
  59 #endif
  60
  61 #include <linux/obd_support.h>
  62 #include <linux/obd_class.h>
  63 #include <linux/lustre_debug.h>
  64 #include <linux/lprocfs_status.h>
  65 #include <portals/lib-types.h> /* for PTL_MD_MAX_IOV */
  66 #include <linux/lustre_build_version.h>
  67
  68 struct semaphore obd_conf_sem;   /* serialize configuration commands */
  69 struct obd_device obd_dev[MAX_OBD_DEVICES];
  70 struct list_head obd_types;
  71 atomic_t obd_memory;
  72 int obd_memmax;
  73
  74 /* Root for /proc/lustre */
  75 struct proc_dir_entry *proc_lustre_root = NULL;
  76
  77 /* The following are visible and mutable through /proc/sys/lustre/. */
  78 unsigned long obd_fail_loc;
  79 unsigned long obd_timeout = 100;
  80 unsigned long obd_bulk_timeout = 1;
  81 char obd_lustre_upcall[128] = "/usr/lib/lustre/lustre_upcall";
  82 unsigned long obd_sync_filter; /* = 0, don't sync by default */
  83
  84 #ifdef __KERNEL__
  85 /*  opening /dev/obd */
  86 static int obd_class_open(struct inode * inode, struct file * file)
  87 {
  88         struct obd_class_user_state *ocus;
  89         ENTRY;
  90
  91         OBD_ALLOC(ocus, sizeof(*ocus));
  92         if (ocus == NULL)
  93                 return (-ENOMEM);
  94
  95         INIT_LIST_HEAD(&ocus->ocus_conns);
  96         file->private_data = ocus;
  97
  98         PORTAL_MODULE_USE;
  99         RETURN(0);
 100 }
 101
 102 /*  closing /dev/obd */
 103 static int obd_class_release(struct inode * inode, struct file * file)
 104 {
 105         struct obd_class_user_state *ocus = file->private_data;
 106         struct obd_class_user_conn  *c;
 107         ENTRY;
 108
 109         while (!list_empty (&ocus->ocus_conns)) {
 110                 c = list_entry (ocus->ocus_conns.next,
 111                                 struct obd_class_user_conn, ocuc_chain);
 112                 list_del (&c->ocuc_chain);
 113
 114                 CDEBUG (D_IOCTL, "Auto-disconnect %p\n", &c->ocuc_conn);
 115
 116                 down (&obd_conf_sem);
 117                 obd_disconnect (&c->ocuc_conn, 0);
 118                 up (&obd_conf_sem);
 119
 120                 OBD_FREE (c, sizeof (*c));
 121         }
 122
 123         OBD_FREE (ocus, sizeof (*ocus));
 124
 125         PORTAL_MODULE_UNUSE;
 126         RETURN(0);
 127 }
 128 #endif
 129
 130 static int
 131 obd_class_add_user_conn (struct obd_class_user_state *ocus,
 132                          struct lustre_handle *conn)
 133 {
 134         struct obd_class_user_conn *c;
 135
 136         /* NB holding obd_conf_sem */
 137
 138         OBD_ALLOC (c, sizeof (*c));
 139         if (ocus == NULL)
 140                 return (-ENOMEM);
 141
 142         c->ocuc_conn = *conn;
 143         list_add (&c->ocuc_chain, &ocus->ocus_conns);
 144         return (0);
 145 }
 146
 147 static void
 148 obd_class_remove_user_conn (struct obd_class_user_state *ocus,
 149                             struct lustre_handle *conn)
 150 {
 151         struct list_head *e;
 152         struct obd_class_user_conn *c;
 153
 154         /* NB holding obd_conf_sem or last reference */
 155
 156         list_for_each (e, &ocus->ocus_conns) {
 157                 c = list_entry (e, struct obd_class_user_conn, ocuc_chain);
 158                 if (conn->cookie == c->ocuc_conn.cookie) {
 159                         list_del (&c->ocuc_chain);
 160                         OBD_FREE (c, sizeof (*c));
 161                         return;
 162                 }
 163         }
 164 }
 165
 166 static inline void obd_data2conn(struct lustre_handle *conn,
 167                                  struct obd_ioctl_data *data)
 168 {
 169         memset(conn, 0, sizeof *conn);
 170         conn->cookie = data->ioc_cookie;
 171 }
 172
 173 static inline void obd_conn2data(struct obd_ioctl_data *data,
 174                                  struct lustre_handle *conn)
 175 {
 176         data->ioc_cookie = conn->cookie;
 177 }
 178
 179 static void dump_exports(struct obd_device *obd)
 180 {
 181         struct list_head *tmp, *n;
 182
 183         list_for_each_safe(tmp, n, &obd->obd_exports) {
 184                 struct obd_export *exp = list_entry(tmp, struct obd_export,
 185                                                     exp_obd_chain);
 186                 CDEBUG(D_ERROR, "%s: %p %s %d %d %p\n",
 187                        obd->obd_name, exp, exp->exp_client_uuid.uuid,
 188                        atomic_read(&exp->exp_refcount),
 189                        exp->exp_failed, exp->exp_outstanding_reply );
 190         }
 191 }
 192
 193 int class_handle_ioctl(struct obd_class_user_state *ocus, unsigned int cmd,
 194                        unsigned long arg)
 195 {
 196         char *buf = NULL;
 197         struct obd_ioctl_data *data;
 198         struct portals_debug_ioctl_data *debug_data;
 199         struct obd_device *obd = ocus->ocus_current_obd;
 200         struct lustre_handle conn;
 201         int err = 0, len = 0, serialised = 0;
 202         ENTRY;
 203
 204         if ((cmd & 0xffffff00) == ((int)'T') << 8) /* ignore all tty ioctls */
 205                 RETURN(err = -ENOTTY);
 206
 207         /* only for debugging */
 208         if (cmd == PTL_IOC_DEBUG_MASK) {
 209                 debug_data = (struct portals_debug_ioctl_data*)arg;
 210                 portal_subsystem_debug = debug_data->subs;
 211                 portal_debug = debug_data->debug;
 212                 return 0;
 213         }
 214
 215         switch (cmd) {
 216         case OBD_IOC_BRW_WRITE:
 217         case OBD_IOC_BRW_READ:
 218         case OBD_IOC_GETATTR:
 219         case ECHO_IOC_ENQUEUE:
 220         case ECHO_IOC_CANCEL:
 221                 break;
 222         default:
 223                 down(&obd_conf_sem);
 224                 serialised = 1;
 225                 break;
 226         }
 227
 228         CDEBUG(D_IOCTL, "cmd = %x, obd = %p\n", cmd, obd);
 229         if (!obd && cmd != OBD_IOC_DEVICE &&
 230             cmd != OBD_IOC_LIST && cmd != OBD_GET_VERSION &&
 231             cmd != OBD_IOC_NAME2DEV && cmd != OBD_IOC_UUID2DEV &&
 232             cmd != OBD_IOC_NEWDEV && cmd != OBD_IOC_ADD_UUID &&
 233             cmd != OBD_IOC_DEL_UUID && cmd != OBD_IOC_CLOSE_UUID) {
 234                 CERROR("OBD ioctl: No device\n");
 235                 GOTO(out, err = -EINVAL);
 236         }
 237         if (obd_ioctl_getdata(&buf, &len, (void *)arg)) {
 238                 CERROR("OBD ioctl: data error\n");
 239                 GOTO(out, err = -EINVAL);
 240         }
 241         data = (struct obd_ioctl_data *)buf;
 242
 243         switch (cmd) {
 244         case OBD_IOC_DEVICE: {
 245                 CDEBUG(D_IOCTL, "\n");
 246                 if (data->ioc_dev >= MAX_OBD_DEVICES || data->ioc_dev < 0) {
 247                         CERROR("OBD ioctl: DEVICE insufficient devices\n");
 248                         GOTO(out, err = -EINVAL);
 249                 }
 250                 CDEBUG(D_IOCTL, "device %d\n", data->ioc_dev);
 251
 252                 ocus->ocus_current_obd = &obd_dev[data->ioc_dev];
 253                 GOTO(out, err = 0);
 254         }
 255
 256         case OBD_IOC_LIST: {
 257                 int i;
 258                 char *buf2 = data->ioc_bulk;
 259                 int remains = data->ioc_inllen1;
 260
 261                 if (!data->ioc_inlbuf1) {
 262                         CERROR("No buffer passed!\n");
 263                         GOTO(out, err = -EINVAL);
 264                 }
 265
 266
 267                 for (i = 0 ; i < MAX_OBD_DEVICES ; i++) {
 268                         int l;
 269                         char *status;
 270                         struct obd_device *obd = &obd_dev[i];
 271
 272                         if (!obd->obd_type)
 273                                 continue;
 274                         if (obd->obd_stopping)
 275                                 status = "ST";
 276                         else if (obd->obd_set_up)
 277                                 status = "UP";
 278                         else if (obd->obd_attached)
 279                                 status = "AT";
 280                         else
 281                                 status = "-";
 282                         l = snprintf(buf2, remains, "%2d %s %s %s %s %d\n",
 283                                      i, status, obd->obd_type->typ_name,
 284                                      obd->obd_name, obd->obd_uuid.uuid,
 285                                      obd->obd_type->typ_refcnt);
 286                         buf2 +=l;
 287                         remains -=l;
 288                         if (remains <= 0) {
 289                                 CERROR("not enough space for device listing\n");
 290                                 break;
 291                         }
 292                 }
 293
 294                 err = copy_to_user((void *)arg, data, len);
 295                 if (err)
 296                         err = -EFAULT;
 297                 GOTO(out, err);
 298         }
 299
 300         case OBD_GET_VERSION:
 301                 if (!data->ioc_inlbuf1) {
 302                         CERROR("No buffer passed in ioctl\n");
 303                         GOTO(out, err = -EINVAL);
 304                 }
 305
 306                 if (strlen(BUILD_VERSION) + 1 > data->ioc_inllen1) {
 307                         CERROR("ioctl buffer too small to hold version\n");
 308                         GOTO(out, err = -EINVAL);
 309                 }
 310
 311                 memcpy(data->ioc_bulk, BUILD_VERSION,
 312                        strlen(BUILD_VERSION) + 1);
 313
 314                 err = copy_to_user((void *)arg, data, len);
 315                 if (err)
 316                         err = -EFAULT;
 317                 GOTO(out, err);
 318
 319         case OBD_IOC_NAME2DEV: {
 320                 /* Resolve a device name.  This does not change the
 321                  * currently selected device.
 322                  */
 323                 int dev;
 324
 325                 if (!data->ioc_inllen1 || !data->ioc_inlbuf1 ) {
 326                         CERROR("No name passed,!\n");
 327                         GOTO(out, err = -EINVAL);
 328                 }
 329                 if (data->ioc_inlbuf1[data->ioc_inllen1 - 1] != 0) {
 330                         CERROR("Name not nul terminated!\n");
 331                         GOTO(out, err = -EINVAL);
 332                 }
 333
 334                 CDEBUG(D_IOCTL, "device name %s\n", data->ioc_inlbuf1);
 335                 dev = class_name2dev(data->ioc_inlbuf1);
 336                 data->ioc_dev = dev;
 337                 if (dev == -1) {
 338                         CDEBUG(D_IOCTL, "No device for name %s!\n",
 339                                data->ioc_inlbuf1);
 340                         GOTO(out, err = -EINVAL);
 341                 }
 342
 343                 CDEBUG(D_IOCTL, "device name %s, dev %d\n", data->ioc_inlbuf1,
 344                        dev);
 345                 err = copy_to_user((void *)arg, data, sizeof(*data));
 346                 if (err)
 347                         err = -EFAULT;
 348                 GOTO(out, err);
 349         }
 350
 351         case OBD_IOC_UUID2DEV: {
 352                 /* Resolve a device uuid.  This does not change the
 353                  * currently selected device.
 354                  */
 355                 int dev;
 356                 struct obd_uuid uuid;
 357
 358                 if (!data->ioc_inllen1 || !data->ioc_inlbuf1) {
 359                         CERROR("No UUID passed!\n");
 360                         GOTO(out, err = -EINVAL);
 361                 }
 362                 if (data->ioc_inlbuf1[data->ioc_inllen1 - 1] != 0) {
 363                         CERROR("UUID not NUL terminated!\n");
 364                         GOTO(out, err = -EINVAL);
 365                 }
 366
 367                 CDEBUG(D_IOCTL, "device name %s\n", data->ioc_inlbuf1);
 368                 obd_str2uuid(&uuid, data->ioc_inlbuf1);
 369                 dev = class_uuid2dev(&uuid);
 370                 data->ioc_dev = dev;
 371                 if (dev == -1) {
 372                         CDEBUG(D_IOCTL, "No device for UUID %s!\n",
 373                                data->ioc_inlbuf1);
 374                         GOTO(out, err = -EINVAL);
 375                 }
 376
 377                 CDEBUG(D_IOCTL, "device name %s, dev %d\n", data->ioc_inlbuf1,
 378                        dev);
 379                 err = copy_to_user((void *)arg, data, sizeof(*data));
 380                 if (err)
 381                         err = -EFAULT;
 382                 GOTO(out, err);
 383         }
 384
 385
 386
 387         case OBD_IOC_NEWDEV: {
 388                 int dev = -1;
 389                 int i;
 390
 391                 ocus->ocus_current_obd = NULL;
 392                 for (i = 0 ; i < MAX_OBD_DEVICES ; i++) {
 393                         struct obd_device *obd = &obd_dev[i];
 394                         if (!obd->obd_type) {
 395                                 ocus->ocus_current_obd = obd;
 396                                 dev = i;
 397                                 break;
 398                         }
 399                 }
 400
 401
 402                 data->ioc_dev = dev;
 403                 if (dev == -1)
 404                         GOTO(out, err = -EINVAL);
 405
 406                 err = copy_to_user((void *)arg, data, sizeof(*data));
 407                 if (err)
 408                         err = -EFAULT;
 409                 GOTO(out, err);
 410         }
 411
 412         case OBD_IOC_ATTACH: {
 413                 struct obd_type *type;
 414                 int minor, len;
 415
 416                 /* have we attached a type to this device */
 417                 if (obd->obd_attached|| obd->obd_type) {
 418                         CERROR("OBD: Device %d already typed as %s.\n",
 419                                obd->obd_minor, MKSTR(obd->obd_type->typ_name));
 420                         GOTO(out, err = -EBUSY);
 421                 }
 422
 423                 if (!data->ioc_inllen1 || !data->ioc_inlbuf1) {
 424                         CERROR("No type passed!\n");
 425                         GOTO(out, err = -EINVAL);
 426                 }
 427                 if (data->ioc_inlbuf1[data->ioc_inllen1 - 1] != 0) {
 428                         CERROR("Type not nul terminated!\n");
 429                         GOTO(out, err = -EINVAL);
 430                 }
 431                 if (!data->ioc_inllen2 || !data->ioc_inlbuf2) {
 432                         CERROR("No name passed!\n");
 433                         GOTO(out, err = -EINVAL);
 434                 }
 435                 if (data->ioc_inlbuf2[data->ioc_inllen2 - 1] != 0) {
 436                         CERROR("Name not nul terminated!\n");
 437                         GOTO(out, err = -EINVAL);
 438                 }
 439                 if (!data->ioc_inllen3 || !data->ioc_inlbuf3) {
 440                         CERROR("No UUID passed!\n");
 441                         GOTO(out, err = -EINVAL);
 442                 }
 443                 if (data->ioc_inlbuf3[data->ioc_inllen3 - 1] != 0) {
 444                         CERROR("UUID not nul terminated!\n");
 445                         GOTO(out, err = -EINVAL);
 446                 }
 447
 448                 CDEBUG(D_IOCTL, "attach type %s name: %s uuid: %s\n",
 449                        MKSTR(data->ioc_inlbuf1),
 450                        MKSTR(data->ioc_inlbuf2), MKSTR(data->ioc_inlbuf3));
 451
 452                 /* find the type */
 453                 type = class_get_type(data->ioc_inlbuf1);
 454                 if (!type) {
 455                         CERROR("OBD: unknown type dev %d\n", obd->obd_minor);
 456                         GOTO(out, err = -EINVAL);
 457                 }
 458
 459                 minor = obd->obd_minor;
 460                 memset(obd, 0, sizeof(*obd));
 461                 obd->obd_minor = minor;
 462                 obd->obd_type = type;
 463                 INIT_LIST_HEAD(&obd->obd_exports);
 464                 INIT_LIST_HEAD(&obd->obd_imports);
 465                 spin_lock_init(&obd->obd_dev_lock);
 466                 init_waitqueue_head(&obd->obd_refcount_waitq);
 467
 468                 /* XXX belong ins setup not attach  */
 469                 /* recovery data */
 470                 spin_lock_init(&obd->obd_processing_task_lock);
 471                 init_waitqueue_head(&obd->obd_next_transno_waitq);
 472                 INIT_LIST_HEAD(&obd->obd_recovery_queue);
 473                 INIT_LIST_HEAD(&obd->obd_delayed_reply_queue);
 474
 475                 init_waitqueue_head(&obd->obd_commit_waitq);
 476
 477                 len = strlen(data->ioc_inlbuf2) + 1;
 478                 OBD_ALLOC(obd->obd_name, len);
 479                 if (!obd->obd_name) {
 480                         class_put_type(obd->obd_type);
 481                         obd->obd_type = NULL;
 482                         GOTO(out, err = -ENOMEM);
 483                 }
 484                 memcpy(obd->obd_name, data->ioc_inlbuf2, len);
 485
 486                 len = strlen(data->ioc_inlbuf3);
 487                 if (len >= sizeof(obd->obd_uuid)) {
 488                         CERROR("uuid must be < "LPSZ" bytes long\n",
 489                                sizeof(obd->obd_uuid));
 490                         if (obd->obd_name)
 491                                 OBD_FREE(obd->obd_name,
 492                                          strlen(obd->obd_name) + 1);
 493                         class_put_type(obd->obd_type);
 494                         obd->obd_type = NULL;
 495                         GOTO(out, err = -EINVAL);
 496                 }
 497                 memcpy(obd->obd_uuid.uuid, data->ioc_inlbuf3, len);
 498
 499                 /* do the attach */
 500                 if (OBP(obd, attach))
 501                         err = OBP(obd,attach)(obd, sizeof(*data), data);
 502                 if (err) {
 503                         if(data->ioc_inlbuf2)
 504                                 OBD_FREE(obd->obd_name,
 505                                          strlen(obd->obd_name) + 1);
 506                         class_put_type(obd->obd_type);
 507                         obd->obd_type = NULL;
 508                 } else {
 509                         obd->obd_attached = 1;
 510
 511                         type->typ_refcnt++;
 512                         CDEBUG(D_IOCTL, "OBD: dev %d attached type %s\n",
 513                                obd->obd_minor, data->ioc_inlbuf1);
 514                 }
 515
 516                 GOTO(out, err);
 517         }
 518
 519         case OBD_IOC_DETACH: {
 520                 ENTRY;
 521                 if (obd->obd_set_up) {
 522                         CERROR("OBD device %d still set up\n", obd->obd_minor);
 523                         GOTO(out, err = -EBUSY);
 524                 }
 525                 if (!obd->obd_attached) {
 526                         CERROR("OBD device %d not attached\n", obd->obd_minor);
 527                         GOTO(out, err = -ENODEV);
 528                 }
 529                 if (OBP(obd, detach))
 530                         err = OBP(obd,detach)(obd);
 531
 532                 if (obd->obd_name) {
 533                         OBD_FREE(obd->obd_name, strlen(obd->obd_name)+1);
 534                         obd->obd_name = NULL;
 535                 }
 536
 537                 obd->obd_attached = 0;
 538                 obd->obd_type->typ_refcnt--;
 539                 class_put_type(obd->obd_type);
 540                 obd->obd_type = NULL;
 541                 GOTO(out, err = 0);
 542         }
 543
 544         case OBD_IOC_SETUP: {
 545                 /* have we attached a type to this device? */
 546                 if (!obd->obd_attached) {
 547                         CERROR("Device %d not attached\n", obd->obd_minor);
 548                         GOTO(out, err = -ENODEV);
 549                 }
 550
 551                 /* has this been done already? */
 552                 if (obd->obd_set_up) {
 553                         CERROR("Device %d already setup (type %s)\n",
 554                                obd->obd_minor, obd->obd_type->typ_name);
 555                         GOTO(out, err = -EBUSY);
 556                 }
 557
 558                 atomic_set(&obd->obd_refcount, 0);
 559
 560                 if ( OBT(obd) && OBP(obd, setup) )
 561                         err = obd_setup(obd, sizeof(*data), data);
 562
 563                 if (!err) {
 564                         obd->obd_type->typ_refcnt++;
 565                         obd->obd_set_up = 1;
 566                         atomic_inc(&obd->obd_refcount);
 567                 }
 568
 569                 GOTO(out, err);
 570         }
 571         case OBD_IOC_CLEANUP: {
 572                 int force = 0, failover = 0;
 573                 char * flag;
 574
 575                 if (!obd->obd_set_up) {
 576                         CERROR("Device %d not setup\n", obd->obd_minor);
 577                         GOTO(out, err = -ENODEV);
 578                 }
 579
 580                 if (data->ioc_inlbuf1) {
 581                         for (flag = data->ioc_inlbuf1; *flag != 0; flag++)
 582                                 switch (*flag) {
 583                                 case 'F':
 584                                         force = 1;
 585                                         break;
 586                                 case 'A':
 587                                         failover = 1;
 588                                         break;
 589                                 default:
 590                                         CERROR("unrecognised flag '%c'\n",
 591                                                *flag);
 592                                 }
 593                 }
 594
 595                 if (atomic_read(&obd->obd_refcount) == 1 || force) {
 596                         /* this will stop new connections, and need to
 597                            do it before class_disconnect_exports() */
 598                         obd->obd_stopping = 1;
 599                 }
 600
 601                 if (atomic_read(&obd->obd_refcount) > 1) {
 602                         struct l_wait_info lwi = LWI_TIMEOUT_INTR(60 * HZ, NULL,
 603                                                                   NULL, NULL);
 604                         int rc;
 605
 606                         if (!force) {
 607                                 CERROR("OBD device %d (%p) has refcount %d\n",
 608                                        obd->obd_minor, obd,
 609                                        atomic_read(&obd->obd_refcount));
 610                                 dump_exports(obd);
 611                                 GOTO(out, err = -EBUSY);
 612                         }
 613                         class_disconnect_exports(obd, failover);
 614                         CDEBUG(D_IOCTL,
 615                                "%s: waiting for obd refs to go away: %d\n",
 616                                obd->obd_name, atomic_read(&obd->obd_refcount));
 617
 618                         rc = l_wait_event(obd->obd_refcount_waitq,
 619                                      atomic_read(&obd->obd_refcount) < 2, &lwi);
 620                         if (rc == 0) {
 621                                 LASSERT(atomic_read(&obd->obd_refcount) == 1);
 622                         } else {
 623                                 CERROR("wait cancelled cleaning anyway. "
 624                                        "refcount: %d\n",
 625                                        atomic_read(&obd->obd_refcount));
 626                                 dump_exports(obd);
 627                         }
 628                         CDEBUG(D_IOCTL, "%s: awake, now finishing cleanup\n",
 629                                obd->obd_name);
 630                 }
 631
 632                 if (OBT(obd) && OBP(obd, cleanup))
 633                         err = obd_cleanup(obd, force, failover);
 634
 635                 if (!err) {
 636                         obd->obd_set_up = obd->obd_stopping = 0;
 637                         obd->obd_type->typ_refcnt--;
 638                         atomic_dec(&obd->obd_refcount);
 639                         /* XXX this should be an LASSERT */
 640                         if (atomic_read(&obd->obd_refcount) > 0)
 641                                 CERROR("%s still has refcount %d after "
 642                                        "cleanup.\n", obd->obd_name,
 643                                        atomic_read(&obd->obd_refcount));
 644                 }
 645
 646                 GOTO(out, err);
 647         }
 648
 649         case OBD_IOC_CONNECT: {
 650                 struct obd_uuid cluuid = { "OBD_CLASS_UUID" };
 651                 obd_data2conn(&conn, data);
 652
 653                 err = obd_connect(&conn, obd, &cluuid);
 654
 655                 CDEBUG(D_IOCTL, "assigned export "LPX64"\n", conn.cookie);
 656                 obd_conn2data(data, &conn);
 657                 if (err)
 658                         GOTO(out, err);
 659
 660                 err = obd_class_add_user_conn (ocus, &conn);
 661                 if (err != 0) {
 662                         obd_disconnect (&conn, 0);
 663                         GOTO (out, err);
 664                 }
 665
 666                 err = copy_to_user((void *)arg, data, sizeof(*data));
 667                 if (err != 0) {
 668                         obd_class_remove_user_conn (ocus, &conn);
 669                         obd_disconnect (&conn, 0);
 670                         GOTO (out, err = -EFAULT);
 671                 }
 672                 GOTO(out, err);
 673         }
 674
 675         case OBD_IOC_DISCONNECT: {
 676                 obd_data2conn(&conn, data);
 677                 obd_class_remove_user_conn (ocus, &conn);
 678                 err = obd_disconnect(&conn, 0);
 679                 GOTO(out, err);
 680         }
 681
 682         case OBD_IOC_NO_TRANSNO: {
 683                 if (!obd->obd_attached) {
 684                         CERROR("Device %d not attached\n", obd->obd_minor);
 685                         GOTO(out, err = -ENODEV);
 686                 }
 687                 CDEBUG(D_IOCTL,
 688                        "disabling committed-transno notifications on %d\n",
 689                        obd->obd_minor);
 690                 obd->obd_no_transno = 1;
 691                 GOTO(out, err = 0);
 692         }
 693
 694         case OBD_IOC_CLOSE_UUID: {
 695                 struct lustre_peer peer;
 696                 CDEBUG(D_IOCTL, "closing all connections to uuid %s\n",
 697                        data->ioc_inlbuf1);
 698                 lustre_uuid_to_peer(data->ioc_inlbuf1, &peer);
 699                 GOTO(out, err = 0);
 700         }
 701         case OBD_IOC_ADD_UUID: {
 702                 CDEBUG(D_IOCTL, "adding mapping from uuid %s to nid "LPX64
 703                        ", nal %d\n", data->ioc_inlbuf1, data->ioc_nid,
 704                        data->ioc_nal);
 705
 706                 err = class_add_uuid(data->ioc_inlbuf1, data->ioc_nid,
 707                                      data->ioc_nal);
 708                 GOTO(out, err);
 709         }
 710         case OBD_IOC_DEL_UUID: {
 711                 CDEBUG(D_IOCTL, "removing mappings for uuid %s\n",
 712                        data->ioc_inlbuf1 == NULL ? "<all uuids>" :
 713                        data->ioc_inlbuf1);
 714
 715                 err = class_del_uuid(data->ioc_inlbuf1);
 716                 GOTO(out, err);
 717         }
 718         default: {
 719                 // obd_data2conn(&conn, data);
 720                 struct obd_class_user_conn *oconn = list_entry(ocus->ocus_conns.next, struct obd_class_user_conn, ocuc_chain);
 721                 err = obd_iocontrol(cmd, &oconn->ocuc_conn, len, data, NULL);
 722                 if (err)
 723                         GOTO(out, err);
 724
 725                 err = copy_to_user((void *)arg, data, len);
 726                 if (err)
 727                         err = -EFAULT;
 728                 GOTO(out, err);
 729         }
 730         }
 731
 732  out:
 733         if (buf)
 734                 obd_ioctl_freedata(buf, len);
 735         if (serialised)
 736                 up(&obd_conf_sem);
 737         RETURN(err);
 738 } /* class_handle_ioctl */
 739
 740
 741
 742 #define OBD_MINOR 241
 743 #ifdef __KERNEL__
 744 /* to control /dev/obd */
 745 static int obd_class_ioctl(struct inode *inode, struct file *filp,
 746                            unsigned int cmd, unsigned long arg)
 747 {
 748         return class_handle_ioctl(filp->private_data, cmd, arg);
 749 }
 750
 751 /* declare character device */
 752 static struct file_operations obd_psdev_fops = {
 753         ioctl:   obd_class_ioctl,       /* ioctl */
 754         open:    obd_class_open,        /* open */
 755         release: obd_class_release,     /* release */
 756 };
 757
 758 /* modules setup */
 759 static struct miscdevice obd_psdev = {
 760         OBD_MINOR,
 761         "obd_psdev",
 762         &obd_psdev_fops
 763 };
 764 #else
 765 void *obd_psdev = NULL;
 766 #endif
 767
 768 EXPORT_SYMBOL(obd_dev);
 769 EXPORT_SYMBOL(obdo_cachep);
 770 EXPORT_SYMBOL(obd_memory);
 771 EXPORT_SYMBOL(obd_memmax);
 772 EXPORT_SYMBOL(obd_fail_loc);
 773 EXPORT_SYMBOL(obd_timeout);
 774 EXPORT_SYMBOL(obd_lustre_upcall);
 775 EXPORT_SYMBOL(obd_sync_filter);
 776 EXPORT_SYMBOL(ptlrpc_put_connection_superhack);
 777 EXPORT_SYMBOL(ptlrpc_abort_inflight_superhack);
 778 EXPORT_SYMBOL(proc_lustre_root);
 779
 780 EXPORT_SYMBOL(lctl_fake_uuid);
 781
 782 EXPORT_SYMBOL(class_register_type);
 783 EXPORT_SYMBOL(class_unregister_type);
 784 EXPORT_SYMBOL(class_get_type);
 785 EXPORT_SYMBOL(class_put_type);
 786 EXPORT_SYMBOL(class_name2dev);
 787 EXPORT_SYMBOL(class_uuid2dev);
 788 EXPORT_SYMBOL(class_uuid2obd);
 789 EXPORT_SYMBOL(class_export_get);
 790 EXPORT_SYMBOL(class_export_put);
 791 EXPORT_SYMBOL(class_new_export);
 792 EXPORT_SYMBOL(class_unlink_export);
 793 EXPORT_SYMBOL(class_import_get);
 794 EXPORT_SYMBOL(class_import_put);
 795 EXPORT_SYMBOL(class_new_import);
 796 EXPORT_SYMBOL(class_destroy_import);
 797 EXPORT_SYMBOL(class_connect);
 798 EXPORT_SYMBOL(class_conn2export);
 799 EXPORT_SYMBOL(class_conn2obd);
 800 EXPORT_SYMBOL(class_conn2cliimp);
 801 EXPORT_SYMBOL(class_conn2ldlmimp);
 802 EXPORT_SYMBOL(class_disconnect);
 803 EXPORT_SYMBOL(class_disconnect_exports);
 804 EXPORT_SYMBOL(lustre_uuid_to_peer);
 805
 806 /* uuid.c */
 807 EXPORT_SYMBOL(class_uuid_unparse);
 808 EXPORT_SYMBOL(client_tgtuuid2obd);
 809
 810 EXPORT_SYMBOL(class_handle_hash);
 811 EXPORT_SYMBOL(class_handle_unhash);
 812 EXPORT_SYMBOL(class_handle2object);
 813
 814 #ifdef __KERNEL__
 815 static int __init init_obdclass(void)
 816 #else
 817 int init_obdclass(void)
 818 #endif
 819 {
 820         struct obd_device *obd;
 821         int err;
 822         int i;
 823
 824         printk(KERN_INFO "OBD class driver Build Version: " BUILD_VERSION
 825                       ", info@clusterfs.com\n");
 826
 827         class_init_uuidlist();
 828         class_handle_init();
 829
 830         sema_init(&obd_conf_sem, 1);
 831         INIT_LIST_HEAD(&obd_types);
 832
 833         if ((err = misc_register(&obd_psdev))) {
 834                 CERROR("cannot register %d err %d\n", OBD_MINOR, err);
 835                 return err;
 836         }
 837
 838         /* This struct is already zerod for us (static global) */
 839         for (i = 0, obd = obd_dev; i < MAX_OBD_DEVICES; i++, obd++)
 840                 obd->obd_minor = i;
 841
 842         err = obd_init_caches();
 843         if (err)
 844                 return err;
 845
 846 #ifdef __KERNEL__
 847         obd_sysctl_init();
 848 #endif
 849
 850 #ifdef LPROCFS
 851         proc_lustre_root = proc_mkdir("lustre", proc_root_fs);
 852         if (!proc_lustre_root)
 853                 printk(KERN_ERR "error registering /proc/fs/lustre\n");
 854 #else
 855         proc_lustre_root = NULL;
 856 #endif
 857         return 0;
 858 }
 859
 860 #ifdef __KERNEL__
 861 static void __exit cleanup_obdclass(void)
 862 #else
 863 static void cleanup_obdclass(void)
 864 #endif
 865 {
 866         int i;
 867         ENTRY;
 868
 869         misc_deregister(&obd_psdev);
 870         for (i = 0; i < MAX_OBD_DEVICES; i++) {
 871                 struct obd_device *obd = &obd_dev[i];
 872                 if (obd->obd_type && obd->obd_set_up &&
 873                     OBT(obd) && OBP(obd, detach)) {
 874                         /* XXX should this call generic detach otherwise? */
 875                         OBP(obd, detach)(obd);
 876                 }
 877         }
 878
 879         obd_cleanup_caches();
 880 #ifdef __KERNEL__
 881         obd_sysctl_clean();
 882 #endif
 883         if (proc_lustre_root) {
 884                 lprocfs_remove(proc_lustre_root);
 885                 proc_lustre_root = NULL;
 886         }
 887
 888         class_handle_cleanup();
 889         class_exit_uuidlist();
 890
 891         CERROR("obd mem max: %d leaked: %d\n", obd_memmax,
 892                atomic_read(&obd_memory));
 893         EXIT;
 894 }
 895
 896 /* Check that we're building against the appropriate version of the Lustre
 897  * kernel patch */
 898 #ifdef __KERNEL__
 899 #include <linux/lustre_version.h>
 900 #define LUSTRE_MIN_VERSION 18
 901 #define LUSTRE_MAX_VERSION 19
 902 #if (LUSTRE_KERNEL_VERSION < LUSTRE_MIN_VERSION)
 903 # error Cannot continue: Your Lustre kernel patch is older than the sources
 904 #elif (LUSTRE_KERNEL_VERSION > LUSTRE_MAX_VERSION)
 905 # error Cannot continue: Your Lustre sources are older than the kernel patch
 906 #endif
 907  #else
 908 # warning "Lib Lustre - no versioning information"
 909 #endif
 910
 911 #ifdef __KERNEL__
 912 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 913 MODULE_DESCRIPTION("Lustre Class Driver Build Version: " BUILD_VERSION);
 914 MODULE_LICENSE("GPL");
 915
 916 module_init(init_obdclass);
 917 module_exit(cleanup_obdclass);
 918 #endif