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