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 #ifndef EXPORT_SYMTAB
  29 # define EXPORT_SYMTAB
  30 #endif
  31 #ifdef __KERNEL__
  32 #include <linux/config.h> /* for CONFIG_PROC_FS */
  33 #include <linux/module.h>
  34 #include <linux/errno.h>
  35 #include <linux/kernel.h>
  36 #include <linux/major.h>
  37 #include <linux/sched.h>
  38 #include <linux/lp.h>
  39 #include <linux/slab.h>
  40 #include <linux/ioport.h>
  41 #include <linux/fcntl.h>
  42 #include <linux/delay.h>
  43 #include <linux/skbuff.h>
  44 #include <linux/proc_fs.h>
  45 #include <linux/fs.h>
  46 #include <linux/poll.h>
  47 #include <linux/init.h>
  48 #include <linux/list.h>
  49 #include <linux/highmem.h>
  50 #include <asm/io.h>
  51 #include <asm/ioctls.h>
  52 #include <asm/system.h>
  53 #include <asm/poll.h>
  54 #include <asm/uaccess.h>
  55 #include <linux/miscdevice.h>
  56 #include <linux/smp_lock.h>
  57 #include <linux/seq_file.h>
  58 #else
  59 # include <liblustre.h>
  60 #endif
  61
  62 #include <linux/obd_support.h>
  63 #include <linux/obd_class.h>
  64 #include <linux/lustre_debug.h>
  65 #include <linux/lprocfs_status.h>
  66 #include <linux/lustre_build_version.h>
  67 #include <portals/list.h>
  68 #include "llog_internal.h"
  69
  70 struct semaphore obd_conf_sem;   /* serialize configuration commands */
  71 struct obd_device obd_dev[MAX_OBD_DEVICES];
  72 struct list_head obd_types;
  73 atomic_t obd_memory;
  74 int obd_memmax;
  75
  76 int proc_version;
  77
  78 /* The following are visible and mutable through /proc/sys/lustre/. */
  79 unsigned int obd_fail_loc;
  80 unsigned int obd_timeout = 100;
  81 char obd_lustre_upcall[128] = "/usr/lib/lustre/lustre_upcall";
  82 unsigned int 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 exp %p\n", c->ocuc_exp);
 115
 116                 down (&obd_conf_sem);
 117                 obd_disconnect (c->ocuc_exp, 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 obd_class_add_user_exp(struct obd_class_user_state *ocus,
 131                                   struct obd_export *exp)
 132 {
 133         struct obd_class_user_conn *c;
 134         ENTRY;
 135         /* NB holding obd_conf_sem */
 136
 137         OBD_ALLOC (c, sizeof (*c));
 138         if (c == NULL)
 139                 RETURN(-ENOMEM);
 140
 141         c->ocuc_exp = class_export_get(exp);
 142         list_add (&c->ocuc_chain, &ocus->ocus_conns);
 143         RETURN(0);
 144 }
 145
 146 static void obd_class_remove_user_exp(struct obd_class_user_state *ocus,
 147                                       struct obd_export *exp)
 148 {
 149         struct obd_class_user_conn *c;
 150         ENTRY;
 151
 152         /* NB holding obd_conf_sem or last reference */
 153
 154         list_for_each_entry(c, &ocus->ocus_conns, ocuc_chain) {
 155                 if (exp == c->ocuc_exp) {
 156                         list_del (&c->ocuc_chain);
 157                         OBD_FREE (c, sizeof (*c));
 158                         class_export_put(exp);
 159                         EXIT;
 160                         return;
 161                 }
 162         }
 163         EXIT;
 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 int class_resolve_dev_name(uint32_t len, char *name)
 180 {
 181         int rc;
 182         int dev;
 183
 184         if (!len || !name) {
 185                 CERROR("No name passed,!\n");
 186                 GOTO(out, rc = -EINVAL);
 187         }
 188         if (name[len - 1] != 0) {
 189                 CERROR("Name not nul terminated!\n");
 190                 GOTO(out, rc = -EINVAL);
 191         }
 192
 193         CDEBUG(D_IOCTL, "device name %s\n", name);
 194         dev = class_name2dev(name);
 195         if (dev == -1) {
 196                 CDEBUG(D_IOCTL, "No device for name %s!\n", name);
 197                 GOTO(out, rc = -EINVAL);
 198         }
 199
 200         CDEBUG(D_IOCTL, "device name %s, dev %d\n", name, dev);
 201         rc = dev;
 202
 203 out:
 204         RETURN(rc);
 205 }
 206
 207 int class_handle_ioctl(struct obd_class_user_state *ocus, unsigned int cmd,
 208                        unsigned long arg)
 209 {
 210         char *buf = NULL;
 211         struct obd_ioctl_data *data;
 212         struct portals_debug_ioctl_data *debug_data;
 213         struct obd_device *obd = ocus->ocus_current_obd;
 214         struct lustre_handle conn;
 215         int err = 0, len = 0, serialised = 0;
 216         ENTRY;
 217
 218         if (current->fsuid != 0)
 219                 RETURN(err = -EACCES);
 220
 221         if ((cmd & 0xffffff00) == ((int)'T') << 8) /* ignore all tty ioctls */
 222                 RETURN(err = -ENOTTY);
 223
 224         /* only for debugging */
 225         if (cmd == PTL_IOC_DEBUG_MASK) {
 226                 debug_data = (struct portals_debug_ioctl_data*)arg;
 227                 portal_subsystem_debug = debug_data->subs;
 228                 portal_debug = debug_data->debug;
 229                 return 0;
 230         }
 231
 232         switch (cmd) {
 233         case OBD_IOC_BRW_WRITE:
 234         case OBD_IOC_BRW_READ:
 235         case OBD_IOC_GETATTR:
 236         case ECHO_IOC_ENQUEUE:
 237         case ECHO_IOC_CANCEL:
 238         case OBD_IOC_CLIENT_RECOVER:
 239         case OBD_IOC_CATLOGLIST:
 240         case OBD_IOC_LLOG_INFO:
 241         case OBD_IOC_LLOG_PRINT:
 242         case OBD_IOC_LLOG_CANCEL:
 243         case OBD_IOC_LLOG_CHECK:
 244         case OBD_IOC_LLOG_REMOVE:
 245                 break;
 246         default:
 247                 down(&obd_conf_sem);
 248                 serialised = 1;
 249                 break;
 250         }
 251
 252         CDEBUG(D_IOCTL, "cmd = %x, obd = %p\n", cmd, obd);
 253         if (!obd && cmd != OBD_IOC_DEVICE &&
 254             cmd != OBD_IOC_LIST && cmd != OBD_GET_VERSION &&
 255             cmd != OBD_IOC_NAME2DEV && cmd != OBD_IOC_UUID2DEV &&
 256             cmd != OBD_IOC_PROCESS_CFG) {
 257                 CERROR("OBD ioctl: No device\n");
 258                 GOTO(out, err = -EINVAL);
 259         }
 260         if (obd_ioctl_getdata(&buf, &len, (void *)arg)) {
 261                 CERROR("OBD ioctl: data error\n");
 262                 GOTO(out, err = -EINVAL);
 263         }
 264         data = (struct obd_ioctl_data *)buf;
 265
 266         switch (cmd) {
 267         case OBD_IOC_DEVICE: {
 268                 CDEBUG(D_IOCTL, "\n");
 269                 if (data->ioc_dev >= MAX_OBD_DEVICES) {
 270                         CERROR("OBD ioctl: DEVICE invalid device %d\n",
 271                                data->ioc_dev);
 272                         ocus->ocus_current_obd = &obd_dev[data->ioc_dev];
 273                         GOTO(out, err = -EINVAL);
 274                 }
 275                 CDEBUG(D_IOCTL, "device %d\n", data->ioc_dev);
 276                 ocus->ocus_current_obd = &obd_dev[data->ioc_dev];
 277                 GOTO(out, err = 0);
 278         }
 279
 280         case OBD_IOC_PROCESS_CFG: {
 281                 char *buf;
 282                 struct lustre_cfg *lcfg;
 283
 284                 /* FIXME hack to liblustre dump, remove when switch
 285                    to zeroconf */
 286 #ifndef __KERNEL__
 287                 data->ioc_pbuf1 = data->ioc_inlbuf1;
 288                 data->ioc_plen1 = data->ioc_inllen1;
 289 #endif
 290                 if (!data->ioc_plen1 || !data->ioc_pbuf1) {
 291                         CERROR("No config buffer passed!\n");
 292                         GOTO(out, err = -EINVAL);
 293                 }
 294                 err = lustre_cfg_getdata(&buf, data->ioc_plen1,
 295                                          data->ioc_pbuf1, 0);
 296                 if (err)
 297                         GOTO(out, err);
 298                 lcfg = (struct lustre_cfg* ) buf;
 299
 300                 err = class_process_config(lcfg);
 301                 lustre_cfg_freedata(buf, data->ioc_plen1);
 302                 GOTO(out, err);
 303         }
 304
 305         case OBD_IOC_LIST: {
 306                 int i;
 307                 char *buf2 = data->ioc_bulk;
 308                 int remains = data->ioc_inllen1;
 309
 310                 if (!data->ioc_inlbuf1) {
 311                         CERROR("No buffer passed!\n");
 312                         GOTO(out, err = -EINVAL);
 313                 }
 314
 315
 316                 for (i = 0 ; i < MAX_OBD_DEVICES ; i++) {
 317                         int l;
 318                         char *status;
 319                         struct obd_device *obd = &obd_dev[i];
 320
 321                         if (!obd->obd_type)
 322                                 continue;
 323                         if (obd->obd_stopping)
 324                                 status = "ST";
 325                         else if (obd->obd_set_up)
 326                                 status = "UP";
 327                         else if (obd->obd_attached)
 328                                 status = "AT";
 329                         else
 330                                 status = "-";
 331                         l = snprintf(buf2, remains, "%2d %s %s %s %s %d\n",
 332                                      i, status, obd->obd_type->typ_name,
 333                                      obd->obd_name, obd->obd_uuid.uuid,
 334                                      obd->obd_type->typ_refcnt);
 335                         buf2 +=l;
 336                         remains -=l;
 337                         if (remains <= 0) {
 338                                 CERROR("not enough space for device listing\n");
 339                                 break;
 340                         }
 341                 }
 342
 343                 err = copy_to_user((void *)arg, data, len);
 344                 if (err)
 345                         err = -EFAULT;
 346                 GOTO(out, err);
 347         }
 348
 349         case OBD_GET_VERSION:
 350                 if (!data->ioc_inlbuf1) {
 351                         CERROR("No buffer passed in ioctl\n");
 352                         GOTO(out, err = -EINVAL);
 353                 }
 354
 355                 if (strlen(BUILD_VERSION) + 1 > data->ioc_inllen1) {
 356                         CERROR("ioctl buffer too small to hold version\n");
 357                         GOTO(out, err = -EINVAL);
 358                 }
 359
 360                 memcpy(data->ioc_bulk, BUILD_VERSION,
 361                        strlen(BUILD_VERSION) + 1);
 362
 363                 err = copy_to_user((void *)arg, data, len);
 364                 if (err)
 365                         err = -EFAULT;
 366                 GOTO(out, err);
 367
 368         case OBD_IOC_NAME2DEV: {
 369                 /* Resolve a device name.  This does not change the
 370                  * currently selected device.
 371                  */
 372                 int dev;
 373
 374                 dev = class_resolve_dev_name(data->ioc_inllen1,
 375                                              data->ioc_inlbuf1);
 376                 data->ioc_dev = dev;
 377                 if (dev < 0)
 378                         GOTO(out, err = -EINVAL);
 379
 380                 err = copy_to_user((void *)arg, data, sizeof(*data));
 381                 if (err)
 382                         err = -EFAULT;
 383                 GOTO(out, err);
 384         }
 385
 386         case OBD_IOC_UUID2DEV: {
 387                 /* Resolve a device uuid.  This does not change the
 388                  * currently selected device.
 389                  */
 390                 int dev;
 391                 struct obd_uuid uuid;
 392
 393                 if (!data->ioc_inllen1 || !data->ioc_inlbuf1) {
 394                         CERROR("No UUID passed!\n");
 395                         GOTO(out, err = -EINVAL);
 396                 }
 397                 if (data->ioc_inlbuf1[data->ioc_inllen1 - 1] != 0) {
 398                         CERROR("UUID not NUL terminated!\n");
 399                         GOTO(out, err = -EINVAL);
 400                 }
 401
 402                 CDEBUG(D_IOCTL, "device name %s\n", data->ioc_inlbuf1);
 403                 obd_str2uuid(&uuid, data->ioc_inlbuf1);
 404                 dev = class_uuid2dev(&uuid);
 405                 data->ioc_dev = dev;
 406                 if (dev == -1) {
 407                         CDEBUG(D_IOCTL, "No device for UUID %s!\n",
 408                                data->ioc_inlbuf1);
 409                         GOTO(out, err = -EINVAL);
 410                 }
 411
 412                 CDEBUG(D_IOCTL, "device name %s, dev %d\n", data->ioc_inlbuf1,
 413                        dev);
 414                 err = copy_to_user((void *)arg, data, sizeof(*data));
 415                 if (err)
 416                         err = -EFAULT;
 417                 GOTO(out, err);
 418         }
 419
 420
 421
 422         case OBD_IOC_CONNECT: {
 423                 struct obd_export *exp;
 424                 obd_data2conn(&conn, data);
 425
 426                 err = obd_connect(&conn, obd, &obd->obd_uuid);
 427
 428                 CDEBUG(D_IOCTL, "assigned export "LPX64"\n", conn.cookie);
 429                 obd_conn2data(data, &conn);
 430                 if (err)
 431                         GOTO(out, err);
 432
 433                 exp = class_conn2export(&conn);
 434                 if (exp == NULL)
 435                         GOTO(out, err = -EINVAL);
 436
 437                 err = obd_class_add_user_exp(ocus, exp);
 438                 if (err != 0) {
 439                         obd_disconnect(exp, 0);
 440                         GOTO (out, err);
 441                 }
 442
 443                 err = copy_to_user((void *)arg, data, sizeof(*data));
 444                 if (err != 0) {
 445                         obd_class_remove_user_exp(ocus, exp);
 446                         obd_disconnect(exp, 0);
 447                         GOTO (out, err = -EFAULT);
 448                 }
 449                 class_export_put(exp);
 450                 GOTO(out, err);
 451         }
 452
 453         case OBD_IOC_DISCONNECT: {
 454                 struct obd_export *exp;
 455                 obd_data2conn(&conn, data);
 456                 exp = class_conn2export(&conn);
 457                 if (exp == NULL)
 458                         GOTO(out, err = -EINVAL);
 459
 460                 obd_class_remove_user_exp(ocus, exp);
 461                 err = obd_disconnect(exp, 0);
 462                 GOTO(out, err);
 463         }
 464
 465         case OBD_IOC_NO_TRANSNO: {
 466                 if (!obd->obd_attached) {
 467                         CERROR("Device %d not attached\n", obd->obd_minor);
 468                         GOTO(out, err = -ENODEV);
 469                 }
 470                 CDEBUG(D_IOCTL,
 471                        "disabling committed-transno notifications on %d\n",
 472                        obd->obd_minor);
 473                 obd->obd_no_transno = 1;
 474                 GOTO(out, err = 0);
 475         }
 476
 477         case OBD_IOC_CLOSE_UUID: {
 478                 struct lustre_peer peer;
 479                 CDEBUG(D_IOCTL, "closing all connections to uuid %s\n",
 480                        data->ioc_inlbuf1);
 481                 lustre_uuid_to_peer(data->ioc_inlbuf1, &peer);
 482                 GOTO(out, err = 0);
 483         }
 484
 485         default: {
 486                 // obd_data2conn(&conn, data);
 487                 struct obd_class_user_conn *oconn;
 488
 489                 if (list_empty(&ocus->ocus_conns))
 490                         GOTO(out, err = -ENOTCONN);
 491
 492                 oconn = list_entry(ocus->ocus_conns.next, struct obd_class_user_conn, ocuc_chain);
 493                 err = obd_iocontrol(cmd, oconn->ocuc_exp, len, data, NULL);
 494                 if (err)
 495                         GOTO(out, err);
 496
 497                 err = copy_to_user((void *)arg, data, len);
 498                 if (err)
 499                         err = -EFAULT;
 500                 GOTO(out, err);
 501         }
 502         }
 503
 504  out:
 505         if (buf)
 506                 obd_ioctl_freedata(buf, len);
 507         if (serialised)
 508                 up(&obd_conf_sem);
 509         RETURN(err);
 510 } /* class_handle_ioctl */
 511
 512
 513
 514 #define OBD_MINOR 241
 515 #ifdef __KERNEL__
 516 /* to control /dev/obd */
 517 static int obd_class_ioctl(struct inode *inode, struct file *filp,
 518                            unsigned int cmd, unsigned long arg)
 519 {
 520         return class_handle_ioctl(filp->private_data, cmd, arg);
 521 }
 522
 523 /* declare character device */
 524 static struct file_operations obd_psdev_fops = {
 525         ioctl:   obd_class_ioctl,       /* ioctl */
 526         open:    obd_class_open,        /* open */
 527         release: obd_class_release,     /* release */
 528 };
 529
 530 /* modules setup */
 531 static struct miscdevice obd_psdev = {
 532         OBD_MINOR,
 533         "obd_psdev",
 534         &obd_psdev_fops
 535 };
 536 #else
 537 void *obd_psdev = NULL;
 538 #endif
 539
 540 EXPORT_SYMBOL(obd_dev);
 541 EXPORT_SYMBOL(obdo_cachep);
 542 EXPORT_SYMBOL(obd_memory);
 543 EXPORT_SYMBOL(obd_memmax);
 544 EXPORT_SYMBOL(obd_fail_loc);
 545 EXPORT_SYMBOL(obd_timeout);
 546 EXPORT_SYMBOL(obd_lustre_upcall);
 547 EXPORT_SYMBOL(obd_sync_filter);
 548 EXPORT_SYMBOL(ptlrpc_put_connection_superhack);
 549 EXPORT_SYMBOL(ptlrpc_abort_inflight_superhack);
 550 EXPORT_SYMBOL(proc_lustre_root);
 551
 552 EXPORT_SYMBOL(class_register_type);
 553 EXPORT_SYMBOL(class_unregister_type);
 554 EXPORT_SYMBOL(class_get_type);
 555 EXPORT_SYMBOL(class_put_type);
 556 EXPORT_SYMBOL(class_name2dev);
 557 EXPORT_SYMBOL(class_name2obd);
 558 EXPORT_SYMBOL(class_uuid2dev);
 559 EXPORT_SYMBOL(class_uuid2obd);
 560 EXPORT_SYMBOL(class_find_client_obd);
 561 EXPORT_SYMBOL(__class_export_put);
 562 EXPORT_SYMBOL(class_new_export);
 563 EXPORT_SYMBOL(class_unlink_export);
 564 EXPORT_SYMBOL(class_import_get);
 565 EXPORT_SYMBOL(class_import_put);
 566 EXPORT_SYMBOL(class_new_import);
 567 EXPORT_SYMBOL(class_destroy_import);
 568 EXPORT_SYMBOL(class_connect);
 569 EXPORT_SYMBOL(class_conn2export);
 570 EXPORT_SYMBOL(class_exp2obd);
 571 EXPORT_SYMBOL(class_conn2obd);
 572 EXPORT_SYMBOL(class_exp2cliimp);
 573 EXPORT_SYMBOL(class_conn2cliimp);
 574 EXPORT_SYMBOL(class_disconnect);
 575 EXPORT_SYMBOL(class_disconnect_exports);
 576
 577 EXPORT_SYMBOL(osic_init);
 578 EXPORT_SYMBOL(osic_release);
 579 EXPORT_SYMBOL(osic_add_one);
 580 EXPORT_SYMBOL(osic_wait);
 581 EXPORT_SYMBOL(osic_complete_one);
 582
 583 /* uuid.c */
 584 EXPORT_SYMBOL(class_uuid_unparse);
 585 EXPORT_SYMBOL(lustre_uuid_to_peer);
 586
 587 EXPORT_SYMBOL(class_handle_hash);
 588 EXPORT_SYMBOL(class_handle_unhash);
 589 EXPORT_SYMBOL(class_handle2object);
 590
 591 /* config.c */
 592 EXPORT_SYMBOL(class_get_profile);
 593 EXPORT_SYMBOL(class_process_config);
 594 EXPORT_SYMBOL(class_config_parse_llog);
 595 EXPORT_SYMBOL(class_config_dump_llog);
 596 EXPORT_SYMBOL(class_attach);
 597 EXPORT_SYMBOL(class_setup);
 598 EXPORT_SYMBOL(class_cleanup);
 599 EXPORT_SYMBOL(class_detach);
 600
 601 #ifdef LPROCFS
 602 int obd_proc_read_version(char *page, char **start, off_t off, int count,
 603                           int *eof, void *data)
 604 {
 605         *eof = 1;
 606         return snprintf(page, count, "%s\n", BUILD_VERSION);
 607 }
 608
 609 int obd_proc_read_pinger(char *page, char **start, off_t off, int count,
 610                          int *eof, void *data)
 611 {
 612         *eof = 1;
 613         return snprintf(page, count, "%s\n",
 614 #ifdef ENABLE_PINGER
 615                         "on"
 616 #else
 617                         "off"
 618 #endif
 619                        );
 620 }
 621
 622 /* Root for /proc/fs/lustre */
 623 struct proc_dir_entry *proc_lustre_root = NULL;
 624 struct lprocfs_vars lprocfs_base[] = {
 625         { "version", obd_proc_read_version, NULL, NULL },
 626         { "pinger", obd_proc_read_pinger, NULL, NULL },
 627         { 0 }
 628 };
 629
 630 static void *obd_device_list_seq_start(struct seq_file *p, loff_t*pos)
 631 {
 632         if (*pos >= MAX_OBD_DEVICES)
 633                 return NULL;
 634         return &obd_dev[*pos];
 635 }
 636
 637 static void obd_device_list_seq_stop(struct seq_file *p, void *v)
 638 {
 639 }
 640
 641 static void *obd_device_list_seq_next(struct seq_file *p, void *v, loff_t *pos)
 642 {
 643         ++*pos;
 644         if (*pos >= MAX_OBD_DEVICES)
 645                 return NULL;
 646         return &obd_dev[*pos];
 647 }
 648
 649 static int obd_device_list_seq_show(struct seq_file *p, void *v)
 650 {
 651         struct obd_device *obd = (struct obd_device *)v;
 652         int index = obd - &obd_dev[0];
 653         char *status;
 654
 655         if (!obd->obd_type)
 656                 return 0;
 657         if (obd->obd_stopping)
 658                 status = "ST";
 659         else if (obd->obd_set_up)
 660                 status = "UP";
 661         else if (obd->obd_attached)
 662                 status = "AT";
 663         else
 664                 status = "--";
 665
 666         return seq_printf(p, "%3d %s %s %s %s %d\n",
 667                           (int)index, status, obd->obd_type->typ_name,
 668                           obd->obd_name, obd->obd_uuid.uuid,
 669                           atomic_read(&obd->obd_refcount));
 670 }
 671
 672 struct seq_operations obd_device_list_sops = {
 673         .start = obd_device_list_seq_start,
 674         .stop = obd_device_list_seq_stop,
 675         .next = obd_device_list_seq_next,
 676         .show = obd_device_list_seq_show,
 677 };
 678
 679 static int obd_device_list_open(struct inode *inode, struct file *file)
 680 {
 681         struct proc_dir_entry *dp = inode->u.generic_ip;
 682         struct seq_file *seq;
 683         int rc = seq_open(file, &obd_device_list_sops);
 684
 685         if (rc)
 686                 return rc;
 687
 688         seq = file->private_data;
 689         seq->private = dp->data;
 690
 691         return 0;
 692 }
 693
 694 struct file_operations obd_device_list_fops = {
 695         .open = obd_device_list_open,
 696         .read = seq_read,
 697         .llseek = seq_lseek,
 698         .release = seq_release,
 699 };
 700 #endif
 701
 702 #ifdef __KERNEL__
 703 static int __init init_obdclass(void)
 704 #else
 705 int init_obdclass(void)
 706 #endif
 707 {
 708         struct obd_device *obd;
 709 #ifdef LPROCFS
 710         struct proc_dir_entry *entry;
 711 #endif
 712         int err;
 713         int i;
 714
 715         printk(KERN_INFO "Lustre: OBD class driver Build Version: "
 716                BUILD_VERSION", info@clusterfs.com\n");
 717
 718         class_init_uuidlist();
 719         err = class_handle_init();
 720         if (err)
 721                 return err;
 722
 723         sema_init(&obd_conf_sem, 1);
 724         INIT_LIST_HEAD(&obd_types);
 725
 726         err = misc_register(&obd_psdev);
 727         if (err) {
 728                 CERROR("cannot register %d err %d\n", OBD_MINOR, err);
 729                 return err;
 730         }
 731
 732         /* This struct is already zerod for us (static global) */
 733         for (i = 0, obd = obd_dev; i < MAX_OBD_DEVICES; i++, obd++)
 734                 obd->obd_minor = i;
 735
 736         err = obd_init_caches();
 737         if (err)
 738                 return err;
 739
 740 #ifdef __KERNEL__
 741         obd_sysctl_init();
 742 #endif
 743
 744 #ifdef LPROCFS
 745         proc_lustre_root = proc_mkdir("lustre", proc_root_fs);
 746         if (!proc_lustre_root) {
 747                 printk(KERN_ERR
 748                        "LustreError: error registering /proc/fs/lustre\n");
 749                 RETURN(-ENOMEM);
 750         }
 751         proc_version = lprocfs_add_vars(proc_lustre_root, lprocfs_base, NULL);
 752         entry = create_proc_entry("devices", 0444, proc_lustre_root);
 753         if (entry == NULL) {
 754                 printk(KERN_ERR "LustreError: error registering "
 755                        "/proc/fs/lustre/devices\n");
 756                 lprocfs_remove(proc_lustre_root);
 757                 RETURN(-ENOMEM);
 758         }
 759         entry->proc_fops = &obd_device_list_fops;
 760 #endif
 761         return 0;
 762 }
 763
 764 #ifdef __KERNEL__
 765 static void /*__exit*/ cleanup_obdclass(void)
 766 #else
 767 static void cleanup_obdclass(void)
 768 #endif
 769 {
 770         int i, leaked;
 771         ENTRY;
 772
 773         misc_deregister(&obd_psdev);
 774         for (i = 0; i < MAX_OBD_DEVICES; i++) {
 775                 struct obd_device *obd = &obd_dev[i];
 776                 if (obd->obd_type && obd->obd_set_up &&
 777                     OBT(obd) && OBP(obd, detach)) {
 778                         /* XXX should this call generic detach otherwise? */
 779                         OBP(obd, detach)(obd);
 780                 }
 781         }
 782
 783         obd_cleanup_caches();
 784 #ifdef __KERNEL__
 785         obd_sysctl_clean();
 786 #endif
 787 #ifdef LPROCFS
 788         if (proc_lustre_root) {
 789                 lprocfs_remove(proc_lustre_root);
 790                 proc_lustre_root = NULL;
 791         }
 792 #endif
 793
 794         class_handle_cleanup();
 795         class_exit_uuidlist();
 796
 797         leaked = atomic_read(&obd_memory);
 798         CDEBUG(leaked ? D_ERROR : D_INFO,
 799                "obd mem max: %d leaked: %d\n", obd_memmax, leaked);
 800
 801         EXIT;
 802 }
 803
 804 /* Check that we're building against the appropriate version of the Lustre
 805  * kernel patch */
 806 #ifdef __KERNEL__
 807 #include <linux/lustre_version.h>
 808 #define LUSTRE_MIN_VERSION 28
 809 #define LUSTRE_MAX_VERSION 32
 810 #if (LUSTRE_KERNEL_VERSION < LUSTRE_MIN_VERSION)
 811 # error Cannot continue: Your Lustre kernel patch is older than the sources
 812 #elif (LUSTRE_KERNEL_VERSION > LUSTRE_MAX_VERSION)
 813 # error Cannot continue: Your Lustre sources are older than the kernel patch
 814 #endif
 815  #else
 816 # warning "Lib Lustre - no versioning information"
 817 #endif
 818
 819 #ifdef __KERNEL__
 820 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 821 MODULE_DESCRIPTION("Lustre Class Driver Build Version: " BUILD_VERSION);
 822 MODULE_LICENSE("GPL");
 823
 824 module_init(init_obdclass);
 825 module_exit(cleanup_obdclass);
 826 #endif