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 #else
  55
  56 # include <liblustre.h>
  57
  58 #endif
  59
  60 #include <linux/obd_support.h>
  61 #include <linux/obd_class.h>
  62 #include <linux/lustre_debug.h>
  63 #include <linux/smp_lock.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 char obd_recovery_upcall[128] = "/usr/lib/lustre/ha_assist";
  81 unsigned long obd_sync_filter; /* = 0, don't sync by default */
  82
  83 /*  opening /dev/obd */
  84 static int obd_class_open(struct inode * inode, struct file * file)
  85 {
  86         struct obd_class_user_state *ocus;
  87         ENTRY;
  88
  89         OBD_ALLOC (ocus, sizeof (*ocus));
  90         if (ocus == NULL)
  91                 return (-ENOMEM);
  92
  93         INIT_LIST_HEAD (&ocus->ocus_conns);
  94         ocus->ocus_current_obd = NULL;
  95         file->private_data = ocus;
  96
  97         MOD_INC_USE_COUNT;
  98         RETURN(0);
  99 }
 100
 101 static int
 102 obd_class_add_user_conn (struct obd_class_user_state *ocus,
 103                          struct lustre_handle *conn)
 104 {
 105         struct obd_class_user_conn *c;
 106
 107         /* NB holding obd_conf_sem */
 108
 109         OBD_ALLOC (c, sizeof (*c));
 110         if (ocus == NULL)
 111                 return (-ENOMEM);
 112
 113         c->ocuc_conn = *conn;
 114         list_add (&c->ocuc_chain, &ocus->ocus_conns);
 115         return (0);
 116 }
 117
 118 static void
 119 obd_class_remove_user_conn (struct obd_class_user_state *ocus,
 120                             struct lustre_handle *conn)
 121 {
 122         struct list_head *e;
 123         struct obd_class_user_conn *c;
 124
 125         /* NB holding obd_conf_sem or last reference */
 126
 127         list_for_each (e, &ocus->ocus_conns) {
 128                 c = list_entry (e, struct obd_class_user_conn, ocuc_chain);
 129                 if (!memcmp (conn, &c->ocuc_conn, sizeof (*conn))) {
 130                         list_del (&c->ocuc_chain);
 131                         OBD_FREE (c, sizeof (*c));
 132                         return;
 133                 }
 134         }
 135 }
 136
 137 /*  closing /dev/obd */
 138 static int obd_class_release(struct inode * inode, struct file * file)
 139 {
 140         struct obd_class_user_state *ocus = file->private_data;
 141         struct obd_class_user_conn  *c;
 142         ENTRY;
 143
 144         while (!list_empty (&ocus->ocus_conns)) {
 145                 c = list_entry (ocus->ocus_conns.next,
 146                                 struct obd_class_user_conn, ocuc_chain);
 147                 list_del (&c->ocuc_chain);
 148
 149                 CDEBUG (D_IOCTL, "Auto-disconnect %p\n", &c->ocuc_conn);
 150
 151                 down (&obd_conf_sem);
 152                 obd_disconnect (&c->ocuc_conn);
 153                 up (&obd_conf_sem);
 154
 155                 OBD_FREE (c, sizeof (*c));
 156         }
 157
 158         OBD_FREE (ocus, sizeof (*ocus));
 159
 160         MOD_DEC_USE_COUNT;
 161         RETURN(0);
 162 }
 163
 164 static inline void obd_data2conn(struct lustre_handle *conn,
 165                                  struct obd_ioctl_data *data)
 166 {
 167         conn->addr = data->ioc_addr;
 168         conn->cookie = data->ioc_cookie;
 169 }
 170
 171 static inline void obd_conn2data(struct obd_ioctl_data *data,
 172                                  struct lustre_handle *conn)
 173 {
 174         data->ioc_addr = conn->addr;
 175         data->ioc_cookie = conn->cookie;
 176 }
 177
 178 static void forcibly_detach_exports(struct obd_device *obd)
 179 {
 180         int rc;
 181         struct list_head *tmp, *n;
 182         struct lustre_handle fake_conn;
 183
 184         CDEBUG(D_IOCTL, "OBD device %d (%p) has exports, "
 185                "disconnecting them", obd->obd_minor, obd);
 186         list_for_each_safe(tmp, n, &obd->obd_exports) {
 187                 struct obd_export *exp = list_entry(tmp, struct obd_export,
 188                                                     exp_obd_chain);
 189                 fake_conn.addr = (__u64)(unsigned long)exp;
 190                 fake_conn.cookie = exp->exp_cookie;
 191                 rc = obd_disconnect(&fake_conn);
 192                 if (rc) {
 193                         CDEBUG(D_IOCTL, "disconnecting export %p failed: %d\n",
 194                                exp, rc);
 195                 } else {
 196                         CDEBUG(D_IOCTL, "export %p disconnected\n", exp);
 197                 }
 198         }
 199 }
 200
 201
 202 int class_handle_ioctl(struct obd_class_user_state *ocus, unsigned int cmd,
 203                        unsigned long arg)
 204 {
 205         char *buf = NULL;
 206         struct obd_ioctl_data *data;
 207         struct obd_device *obd = ocus->ocus_current_obd;
 208         struct lustre_handle conn;
 209         int err = 0, len = 0, serialised = 0;
 210         ENTRY;
 211
 212         switch (cmd) {
 213         case OBD_IOC_BRW_WRITE:
 214         case OBD_IOC_BRW_READ:
 215         case OBD_IOC_GETATTR:
 216         case ECHO_IOC_ENQUEUE:
 217         case ECHO_IOC_CANCEL:
 218                 break;
 219         default:
 220                 down(&obd_conf_sem);
 221                 serialised = 1;
 222                 break;
 223         }
 224
 225         if (!obd && cmd != OBD_IOC_DEVICE && cmd != TCGETS &&
 226             cmd != OBD_IOC_LIST && cmd != OBD_GET_VERSION &&
 227             cmd != OBD_IOC_NAME2DEV && cmd != OBD_IOC_NEWDEV &&
 228             cmd != OBD_IOC_ADD_UUID && cmd != OBD_IOC_DEL_UUID  &&
 229             cmd != OBD_IOC_CLOSE_UUID) {
 230                 CERROR("OBD ioctl: No device\n");
 231                 GOTO(out, err = -EINVAL);
 232         }
 233         if (obd_ioctl_getdata(&buf, &len, (void *)arg)) {
 234                 CERROR("OBD ioctl: data error\n");
 235                 GOTO(out, err = -EINVAL);
 236         }
 237         data = (struct obd_ioctl_data *)buf;
 238
 239         switch (cmd) {
 240         case TCGETS:
 241                 GOTO(out, err=-EINVAL);
 242         case OBD_IOC_DEVICE: {
 243                 CDEBUG(D_IOCTL, "\n");
 244                 if (data->ioc_dev >= MAX_OBD_DEVICES || data->ioc_dev < 0) {
 245                         CERROR("OBD ioctl: DEVICE insufficient devices\n");
 246                         GOTO(out, err=-EINVAL);
 247                 }
 248                 CDEBUG(D_IOCTL, "device %d\n", data->ioc_dev);
 249
 250                 ocus->ocus_current_obd = &obd_dev[data->ioc_dev];
 251                 GOTO(out, err=0);
 252         }
 253
 254         case OBD_IOC_LIST: {
 255                 int i;
 256                 char *buf2 = data->ioc_bulk;
 257                 int remains = data->ioc_inllen1;
 258
 259                 if (!data->ioc_inlbuf1) {
 260                         CERROR("No buffer passed!\n");
 261                         GOTO(out, err=-EINVAL);
 262                 }
 263
 264
 265                 for (i = 0 ; i < MAX_OBD_DEVICES ; i++) {
 266                         int l;
 267                         char *status;
 268                         struct obd_device *obd = &obd_dev[i];
 269                         if (!obd->obd_type)
 270                                 continue;
 271                         if (obd->obd_flags & OBD_SET_UP)
 272                                 status = "UP";
 273                         else if (obd->obd_flags & OBD_ATTACHED)
 274                                 status = "AT";
 275                         else
 276                                 status = "-";
 277                         l = snprintf(buf2, remains, "%2d %s %s %s %s %d\n",
 278                                      i, status, obd->obd_type->typ_name,
 279                                      obd->obd_name, obd->obd_uuid.uuid,
 280                                      obd->obd_type->typ_refcnt);
 281                         buf2 +=l;
 282                         remains -=l;
 283                         if (remains <= 0) {
 284                                 CERROR("not enough space for device listing\n");
 285                                 break;
 286                         }
 287                 }
 288
 289                 err = copy_to_user((void *)arg, data, len);
 290                 if (err)
 291                         err = -EFAULT;
 292                 GOTO(out, err);
 293         }
 294
 295         case OBD_GET_VERSION:
 296                 if (!data->ioc_inlbuf1) {
 297                         CERROR("No buffer passed in ioctl\n");
 298                         GOTO(out, err = -EINVAL);
 299                 }
 300
 301                 if (strlen(BUILD_VERSION) + 1 > data->ioc_inllen1) {
 302                         CERROR("ioctl buffer too small to hold version\n");
 303                         GOTO(out, err = -EINVAL);
 304                 }
 305
 306                 memcpy(data->ioc_bulk, BUILD_VERSION,
 307                        strlen(BUILD_VERSION) + 1);
 308
 309                 err = copy_to_user((void *)arg, data, len);
 310                 if (err)
 311                         err = -EFAULT;
 312                 GOTO(out, err);
 313
 314         case OBD_IOC_NAME2DEV: {
 315                 /* Resolve a device name.  This does not change the
 316                  * currently selected device.
 317                  */
 318                 int dev;
 319
 320                 if (!data->ioc_inllen1 || !data->ioc_inlbuf1 ) {
 321                         CERROR("No name passed,!\n");
 322                         GOTO(out, err=-EINVAL);
 323                 }
 324                 if (data->ioc_inlbuf1[data->ioc_inllen1-1] !=0) {
 325                         CERROR("Name not nul terminated!\n");
 326                         GOTO(out, err=-EINVAL);
 327                 }
 328
 329                 CDEBUG(D_IOCTL, "device name %s\n", data->ioc_inlbuf1);
 330                 dev = class_name2dev(data->ioc_inlbuf1);
 331                 data->ioc_dev = dev;
 332                 if (dev == -1) {
 333                         CDEBUG(D_IOCTL, "No device for name %s!\n",
 334                                data->ioc_inlbuf1);
 335                         GOTO(out, err=-EINVAL);
 336                 }
 337
 338                 CDEBUG(D_IOCTL, "device name %s, dev %d\n", data->ioc_inlbuf1,
 339                        dev);
 340                 err = copy_to_user((void *)arg, data, sizeof(*data));
 341                 if (err)
 342                         err = -EFAULT;
 343                 GOTO(out, err);
 344         }
 345
 346         case OBD_IOC_UUID2DEV: {
 347                 /* Resolve a device uuid.  This does not change the
 348                  * currently selected device.
 349                  */
 350                 int dev;
 351                 struct obd_uuid uuid;
 352
 353                 if (!data->ioc_inllen1 || !data->ioc_inlbuf1) {
 354                         CERROR("No UUID passed!\n");
 355                         GOTO(out, err=-EINVAL);
 356                 }
 357                 if (data->ioc_inlbuf1[data->ioc_inllen1-1] !=0) {
 358                         CERROR("Name not nul terminated!\n");
 359                         GOTO(out, err=-EINVAL);
 360                 }
 361
 362                 CDEBUG(D_IOCTL, "device name %s\n", data->ioc_inlbuf1);
 363                 obd_str2uuid(&uuid, data->ioc_inlbuf1);
 364                 dev = class_uuid2dev(&uuid);
 365                 data->ioc_dev = dev;
 366                 if (dev == -1) {
 367                         CDEBUG(D_IOCTL, "No device for name %s!\n",
 368                                data->ioc_inlbuf1);
 369                         GOTO(out, err=-EINVAL);
 370                 }
 371
 372                 CDEBUG(D_IOCTL, "device name %s, dev %d\n", data->ioc_inlbuf1,
 373                        dev);
 374                 err = copy_to_user((void *)arg, data, sizeof(*data));
 375                 if (err)
 376                         err = -EFAULT;
 377                 GOTO(out, err);
 378         }
 379
 380         case OBD_IOC_NEWDEV: {
 381                 int dev = -1;
 382                 int i;
 383
 384                 ocus->ocus_current_obd = NULL;
 385                 for (i = 0 ; i < MAX_OBD_DEVICES ; i++) {
 386                         struct obd_device *obd = &obd_dev[i];
 387                         if (!obd->obd_type) {
 388                                 ocus->ocus_current_obd = obd;
 389                                 dev = i;
 390                                 break;
 391                         }
 392                 }
 393
 394
 395                 data->ioc_dev = dev;
 396                 if (dev == -1)
 397                         GOTO(out, err=-EINVAL);
 398
 399                 err = copy_to_user((void *)arg, data, sizeof(*data));
 400                 if (err)
 401                         err = -EFAULT;
 402                 GOTO(out, err);
 403         }
 404
 405         case OBD_IOC_ATTACH: {
 406                 struct obd_type *type;
 407                 int minor, len;
 408
 409                 /* have we attached a type to this device */
 410                 if (obd->obd_flags & OBD_ATTACHED || obd->obd_type) {
 411                         CERROR("OBD: Device %d already typed as %s.\n",
 412                                obd->obd_minor, MKSTR(obd->obd_type->typ_name));
 413                         GOTO(out, err = -EBUSY);
 414                 }
 415
 416                 if (!data->ioc_inllen1 || !data->ioc_inlbuf1) {
 417                         CERROR("No type passed!\n");
 418                         GOTO(out, err = -EINVAL);
 419                 }
 420                 if (data->ioc_inlbuf1[data->ioc_inllen1-1] !=0) {
 421                         CERROR("Type not nul terminated!\n");
 422                         GOTO(out, err = -EINVAL);
 423                 }
 424                 if (!data->ioc_inllen2 || !data->ioc_inlbuf2) {
 425                         CERROR("No name passed!\n");
 426                         GOTO(out, err = -EINVAL);
 427                 }
 428                 CDEBUG(D_IOCTL, "attach type %s name: %s uuid: %s\n",
 429                        MKSTR(data->ioc_inlbuf1),
 430                        MKSTR(data->ioc_inlbuf2), MKSTR(data->ioc_inlbuf3));
 431
 432                 /* find the type */
 433                 type = class_get_type(data->ioc_inlbuf1);
 434                 if (!type) {
 435                         CERROR("OBD: unknown type dev %d\n", obd->obd_minor);
 436                         GOTO(out, err = -EINVAL);
 437                 }
 438
 439                 minor = obd->obd_minor;
 440                 memset(obd, 0, sizeof(*obd));
 441                 obd->obd_minor = minor;
 442                 obd->obd_type = type;
 443                 INIT_LIST_HEAD(&obd->obd_exports);
 444                 INIT_LIST_HEAD(&obd->obd_imports);
 445                 spin_lock_init(&obd->obd_dev_lock);
 446
 447                 /* XXX belong ins setup not attach  */
 448                 /* recovery data */
 449                 spin_lock_init(&obd->obd_processing_task_lock);
 450                 init_waitqueue_head(&obd->obd_next_transno_waitq);
 451                 INIT_LIST_HEAD(&obd->obd_recovery_queue);
 452                 INIT_LIST_HEAD(&obd->obd_delayed_reply_queue);
 453
 454                 len = strlen(data->ioc_inlbuf2) + 1;
 455                 OBD_ALLOC(obd->obd_name, len);
 456                 if (!obd->obd_name) {
 457                         class_put_type(obd->obd_type);
 458                         obd->obd_type = NULL;
 459                         GOTO(out, err = -ENOMEM);
 460                 }
 461                 memcpy(obd->obd_name, data->ioc_inlbuf2, len);
 462
 463                 if (data->ioc_inlbuf3) {
 464                         int len = strlen(data->ioc_inlbuf3);
 465                         if (len >= sizeof(obd->obd_uuid)) {
 466                                 CERROR("uuid must be < "LPSZ" bytes long\n",
 467                                        sizeof(obd->obd_uuid));
 468                                 if (obd->obd_name)
 469                                         OBD_FREE(obd->obd_name,
 470                                                  strlen(obd->obd_name) + 1);
 471                                 class_put_type(obd->obd_type);
 472                                 obd->obd_type = NULL;
 473                                 GOTO(out, err=-EINVAL);
 474                         }
 475                         memcpy(obd->obd_uuid.uuid, data->ioc_inlbuf3, len);
 476                 }
 477                 /* do the attach */
 478                 if (OBP(obd, attach))
 479                         err = OBP(obd,attach)(obd, sizeof(*data), data);
 480                 if (err) {
 481                         if(data->ioc_inlbuf2)
 482                                 OBD_FREE(obd->obd_name,
 483                                          strlen(obd->obd_name) + 1);
 484                         class_put_type(obd->obd_type);
 485                         obd->obd_type = NULL;
 486                 } else {
 487                         obd->obd_flags |= OBD_ATTACHED;
 488
 489                         type->typ_refcnt++;
 490                         CDEBUG(D_IOCTL, "OBD: dev %d attached type %s\n",
 491                                obd->obd_minor, data->ioc_inlbuf1);
 492                 }
 493
 494                 GOTO(out, err);
 495         }
 496
 497         case OBD_IOC_DETACH: {
 498                 ENTRY;
 499                 if (obd->obd_flags & OBD_SET_UP) {
 500                         CERROR("OBD device %d still set up\n", obd->obd_minor);
 501                         GOTO(out, err=-EBUSY);
 502                 }
 503                 if (!(obd->obd_flags & OBD_ATTACHED) ) {
 504                         CERROR("OBD device %d not attached\n", obd->obd_minor);
 505                         GOTO(out, err=-ENODEV);
 506                 }
 507                 if (OBP(obd, detach))
 508                         err = OBP(obd,detach)(obd);
 509
 510                 if (obd->obd_name) {
 511                         OBD_FREE(obd->obd_name, strlen(obd->obd_name)+1);
 512                         obd->obd_name = NULL;
 513                 }
 514
 515                 obd->obd_flags &= ~OBD_ATTACHED;
 516                 obd->obd_type->typ_refcnt--;
 517                 class_put_type(obd->obd_type);
 518                 obd->obd_type = NULL;
 519                 GOTO(out, err = 0);
 520         }
 521
 522         case OBD_IOC_SETUP: {
 523                 /* have we attached a type to this device? */
 524                 if (!(obd->obd_flags & OBD_ATTACHED)) {
 525                         CERROR("Device %d not attached\n", obd->obd_minor);
 526                         GOTO(out, err=-ENODEV);
 527                 }
 528
 529                 /* has this been done already? */
 530                 if ( obd->obd_flags & OBD_SET_UP ) {
 531                         CERROR("Device %d already setup (type %s)\n",
 532                                obd->obd_minor, obd->obd_type->typ_name);
 533                         GOTO(out, err=-EBUSY);
 534                 }
 535
 536                 if ( OBT(obd) && OBP(obd, setup) )
 537                         err = obd_setup(obd, sizeof(*data), data);
 538
 539                 if (!err) {
 540                         obd->obd_type->typ_refcnt++;
 541                         obd->obd_flags |= OBD_SET_UP;
 542                 }
 543
 544                 GOTO(out, err);
 545         }
 546         case OBD_IOC_CLEANUP: {
 547                 /* have we attached a type to this device? */
 548                 if (!(obd->obd_flags & OBD_ATTACHED)) {
 549                         CERROR("Device %d not attached\n", obd->obd_minor);
 550                         GOTO(out, err=-ENODEV);
 551                 }
 552                 if (!list_empty(&obd->obd_exports)) {
 553                         if (!data->ioc_inlbuf1 || data->ioc_inlbuf1[0] != 'F') {
 554                                 CERROR("OBD device %d (%p) has exports\n",
 555                                        obd->obd_minor, obd);
 556                                 GOTO(out, err = -EBUSY);
 557                         }
 558                         forcibly_detach_exports(obd);
 559                 }
 560                 if (OBT(obd) && OBP(obd, cleanup))
 561                         err = obd_cleanup(obd);
 562
 563                 if (!err) {
 564                         obd->obd_flags &= ~OBD_SET_UP;
 565                         obd->obd_type->typ_refcnt--;
 566                 }
 567                 GOTO(out, err);
 568         }
 569
 570         case OBD_IOC_CONNECT: {
 571                 struct obd_uuid cluuid = { "OBD_CLASS_UUID" };
 572                 obd_data2conn(&conn, data);
 573
 574                 err = obd_connect(&conn, obd, &cluuid, NULL, NULL);
 575
 576                 CDEBUG(D_IOCTL, "assigned export "LPX64"\n", conn.addr);
 577                 obd_conn2data(data, &conn);
 578                 if (err)
 579                         GOTO(out, err);
 580
 581                 err = obd_class_add_user_conn (ocus, &conn);
 582                 if (err != 0) {
 583                         obd_disconnect (&conn);
 584                         GOTO (out, err);
 585                 }
 586
 587                 err = copy_to_user((void *)arg, data, sizeof(*data));
 588                 if (err != 0) {
 589                         obd_class_remove_user_conn (ocus, &conn);
 590                         obd_disconnect (&conn);
 591                         GOTO (out, err=-EFAULT);
 592                 }
 593                 GOTO(out, err);
 594         }
 595
 596         case OBD_IOC_DISCONNECT: {
 597                 obd_data2conn(&conn, data);
 598                 obd_class_remove_user_conn (ocus, &conn);
 599                 err = obd_disconnect(&conn);
 600                 GOTO(out, err);
 601         }
 602
 603         case OBD_IOC_NO_TRANSNO: {
 604                 if (!(obd->obd_flags & OBD_ATTACHED)) {
 605                         CERROR("Device %d not attached\n", obd->obd_minor);
 606                         GOTO(out, err=-ENODEV);
 607                 }
 608                 CDEBUG(D_IOCTL,
 609                        "disabling committed-transno notifications on %d\n",
 610                        obd->obd_minor);
 611                 obd->obd_flags |= OBD_NO_TRANSNO;
 612                 GOTO(out, err = 0);
 613         }
 614
 615         case OBD_IOC_CLOSE_UUID: {
 616                 struct lustre_peer peer;
 617                 CDEBUG(D_IOCTL, "closing all connections to uuid %s\n",
 618                        data->ioc_inlbuf1);
 619                 lustre_uuid_to_peer(data->ioc_inlbuf1, &peer);
 620                 GOTO(out, err = 0);
 621         }
 622         case OBD_IOC_ADD_UUID: {
 623                 CDEBUG(D_IOCTL, "adding mapping from uuid %s to nid "LPX64
 624                        ", nal %d\n", data->ioc_inlbuf1, data->ioc_nid,
 625                        data->ioc_nal);
 626
 627                 err = class_add_uuid(data->ioc_inlbuf1, data->ioc_nid,
 628                                      data->ioc_nal);
 629                 GOTO(out, err);
 630         }
 631         case OBD_IOC_DEL_UUID: {
 632                 CDEBUG(D_IOCTL, "removing mappings for uuid %s\n",
 633                        data->ioc_inlbuf1 == NULL ? "<all uuids>" :
 634                        data->ioc_inlbuf1);
 635
 636                 err = class_del_uuid(data->ioc_inlbuf1);
 637                 GOTO(out, err);
 638         }
 639         default: {
 640                 // obd_data2conn(&conn, data);
 641                 struct obd_class_user_conn *oconn = list_entry(ocus->ocus_conns.next, struct obd_class_user_conn, ocuc_chain);
 642                 err = obd_iocontrol(cmd, &oconn->ocuc_conn, len, data, NULL);
 643                 if (err)
 644                         GOTO(out, err);
 645
 646                 err = copy_to_user((void *)arg, data, len);
 647                 if (err)
 648                         err = -EFAULT;
 649                 GOTO(out, err);
 650         }
 651         }
 652
 653  out:
 654         if (buf)
 655                 OBD_FREE(buf, len);
 656         if (serialised)
 657                 up(&obd_conf_sem);
 658         RETURN(err);
 659 } /* obd_class_ioctl */
 660
 661
 662
 663 #define OBD_MINOR 241
 664 #ifdef __KERNEL__
 665 /* to control /dev/obd */
 666 static int obd_class_ioctl (struct inode * inode, struct file * filp,
 667                      unsigned int cmd, unsigned long arg)
 668 {
 669         return class_handle_ioctl(filp->private_data, cmd, arg);
 670 }
 671
 672 /* declare character device */
 673 static struct file_operations obd_psdev_fops = {
 674         ioctl: obd_class_ioctl,      /* ioctl */
 675         open: obd_class_open,        /* open */
 676         release: obd_class_release,  /* release */
 677 };
 678
 679 /* modules setup */
 680 static struct miscdevice obd_psdev = {
 681         OBD_MINOR,
 682         "obd_psdev",
 683         &obd_psdev_fops
 684 };
 685 #else
 686 void *obd_psdev = NULL;
 687 #endif
 688
 689 void (*class_signal_connection_failure)(struct ptlrpc_connection *);
 690
 691 #ifdef CONFIG_HIGHMEM
 692 /* Allow at most 3/4 of the kmap mappings to be consumed by vector I/O
 693  * requests.  This avoids deadlocks on servers which have a lot of clients
 694  * doing vector I/O.  We don't need to do this for non-vector I/O requests
 695  * because singleton requests will just block on the kmap itself and never
 696  * deadlock waiting for additional kmaps to complete.
 697  *
 698  * If we are a "server" task, we can have at most a single reservation
 699  * in excess of the maximum.  This avoids a deadlock when multiple client
 700  * threads are on the same machine as the server threads, and the clients
 701  * have consumed all of the available mappings.  As long as a single server
 702  * thread is can make progress, we are guaranteed to avoid deadlock.
 703  */
 704 #define OBD_KMAP_MAX (LAST_PKMAP * 3 / 4)
 705 static atomic_t obd_kmap_count = ATOMIC_INIT(OBD_KMAP_MAX);
 706 static DECLARE_WAIT_QUEUE_HEAD(obd_kmap_waitq);
 707
 708 void obd_kmap_get(int count, int server)
 709 {
 710         //CERROR("getting %d kmap counts (%d/%d)\n", count,
 711         //       atomic_read(&obd_kmap_count), OBD_KMAP_MAX);
 712         if (count == 1)
 713                 atomic_dec(&obd_kmap_count);
 714         else while (atomic_add_negative(-count, &obd_kmap_count)) {
 715                 static long next_show = 0;
 716                 static int skipped = 0;
 717
 718                 if (server && atomic_read(&obd_kmap_count) >= -PTL_MD_MAX_IOV)
 719                         break;
 720
 721                 CDEBUG(D_OTHER, "negative kmap reserved count: %d\n",
 722                        atomic_read(&obd_kmap_count));
 723                 atomic_add(count, &obd_kmap_count);
 724
 725                 if (time_after(jiffies, next_show)) {
 726                         CERROR("blocking %s (and %d others) for kmaps\n",
 727                                current->comm, skipped);
 728                         next_show = jiffies + 5*HZ;
 729                         skipped = 0;
 730                 } else
 731                         skipped++;
 732                 wait_event(obd_kmap_waitq,
 733                            atomic_read(&obd_kmap_count) >= count);
 734         }
 735 }
 736
 737 void obd_kmap_put(int count)
 738 {
 739         atomic_add(count, &obd_kmap_count);
 740         /* Wake up sleepers.  Sadly, this wakes up all of the tasks at once.
 741          * We could have something smarter here like:
 742         while (atomic_read(&obd_kmap_count) > 0)
 743                 wake_up_nr(obd_kmap_waitq, 1);
 744         although we would need to set somewhere (probably obd_class_init):
 745         obd_kmap_waitq.flags |= WQ_FLAG_EXCLUSIVE;
 746         For now the wait_event() condition will handle this OK I believe.
 747          */
 748         if (atomic_read(&obd_kmap_count) > 0)
 749                 wake_up(&obd_kmap_waitq);
 750 }
 751
 752 EXPORT_SYMBOL(obd_kmap_get);
 753 EXPORT_SYMBOL(obd_kmap_put);
 754 #endif
 755
 756 EXPORT_SYMBOL(obd_dev);
 757 EXPORT_SYMBOL(obdo_cachep);
 758 EXPORT_SYMBOL(obd_memory);
 759 EXPORT_SYMBOL(obd_memmax);
 760 EXPORT_SYMBOL(obd_fail_loc);
 761 EXPORT_SYMBOL(obd_timeout);
 762 EXPORT_SYMBOL(obd_recovery_upcall);
 763 EXPORT_SYMBOL(obd_sync_filter);
 764 EXPORT_SYMBOL(ptlrpc_put_connection_superhack);
 765 EXPORT_SYMBOL(ptlrpc_abort_inflight_superhack);
 766 EXPORT_SYMBOL(proc_lustre_root);
 767
 768 EXPORT_SYMBOL(class_register_type);
 769 EXPORT_SYMBOL(class_unregister_type);
 770 EXPORT_SYMBOL(class_get_type);
 771 EXPORT_SYMBOL(class_put_type);
 772 EXPORT_SYMBOL(class_name2dev);
 773 EXPORT_SYMBOL(class_uuid2dev);
 774 EXPORT_SYMBOL(class_uuid2obd);
 775 EXPORT_SYMBOL(class_new_export);
 776 EXPORT_SYMBOL(class_destroy_export);
 777 EXPORT_SYMBOL(class_connect);
 778 EXPORT_SYMBOL(class_conn2export);
 779 EXPORT_SYMBOL(class_conn2obd);
 780 EXPORT_SYMBOL(class_conn2cliimp);
 781 EXPORT_SYMBOL(class_conn2ldlmimp);
 782 EXPORT_SYMBOL(class_disconnect);
 783 EXPORT_SYMBOL(class_disconnect_all);
 784 EXPORT_SYMBOL(class_uuid_unparse);
 785 EXPORT_SYMBOL(lustre_uuid_to_peer);
 786
 787 EXPORT_SYMBOL(class_signal_connection_failure);
 788
 789 EXPORT_SYMBOL(class_handle_hash);
 790 EXPORT_SYMBOL(class_handle_unhash);
 791 EXPORT_SYMBOL(class_handle2object);
 792
 793 #ifdef __KERNEL__
 794 static int __init init_obdclass(void)
 795 #else
 796 int init_obdclass(void)
 797 #endif
 798 {
 799         struct obd_device *obd;
 800         int err;
 801         int i;
 802
 803         printk(KERN_INFO "OBD class driver Build Version: " BUILD_VERSION
 804                       ", info@clusterfs.com\n");
 805
 806         class_init_uuidlist();
 807         class_handle_init();
 808
 809         sema_init(&obd_conf_sem, 1);
 810         INIT_LIST_HEAD(&obd_types);
 811
 812         if ((err = misc_register(&obd_psdev))) {
 813                 CERROR("cannot register %d err %d\n", OBD_MINOR, err);
 814                 return err;
 815         }
 816
 817         /* This struct is already zerod for us (static global) */
 818         for (i = 0, obd = obd_dev; i < MAX_OBD_DEVICES; i++, obd++)
 819                 obd->obd_minor = i;
 820
 821         err = obd_init_caches();
 822         if (err)
 823                 return err;
 824
 825 #ifdef __KERNEL__
 826         obd_sysctl_init();
 827 #endif
 828
 829 #ifdef LPROCFS
 830         proc_lustre_root = proc_mkdir("lustre", proc_root_fs);
 831         if (!proc_lustre_root)
 832                 printk(KERN_ERR "error registering /proc/fs/lustre\n");
 833 #else
 834         proc_lustre_root = NULL;
 835 #endif
 836         return 0;
 837 }
 838
 839 #ifdef __KERNEL__
 840 static void __exit cleanup_obdclass(void)
 841 #else
 842 static void cleanup_obdclass(void)
 843 #endif
 844 {
 845         int i;
 846         ENTRY;
 847
 848         misc_deregister(&obd_psdev);
 849         for (i = 0; i < MAX_OBD_DEVICES; i++) {
 850                 struct obd_device *obd = &obd_dev[i];
 851                 if (obd->obd_type && (obd->obd_flags & OBD_SET_UP) &&
 852                     OBT(obd) && OBP(obd, detach)) {
 853                         /* XXX should this call generic detach otherwise? */
 854                         OBP(obd, detach)(obd);
 855                 }
 856         }
 857
 858         obd_cleanup_caches();
 859 #ifdef __KERNEL__
 860         obd_sysctl_clean();
 861 #endif
 862         if (proc_lustre_root) {
 863                 lprocfs_remove(proc_lustre_root);
 864                 proc_lustre_root = NULL;
 865         }
 866
 867         class_handle_cleanup();
 868         class_exit_uuidlist();
 869
 870         CERROR("obd mem max: %d leaked: %d\n", obd_memmax,
 871                atomic_read(&obd_memory));
 872         EXIT;
 873 }
 874
 875 /* Check that we're building against the appropriate version of the Lustre
 876  * kernel patch */
 877 #ifdef __KERNEL__
 878 #include <linux/lustre_version.h>
 879 #define LUSTRE_SOURCE_VERSION 13
 880 #if (LUSTRE_KERNEL_VERSION < LUSTRE_SOURCE_VERSION)
 881 # error Cannot continue: Your Lustre kernel patch is older than the sources
 882 #elif (LUSTRE_KERNEL_VERSION > LUSTRE_SOURCE_VERSION)
 883 # error Cannot continue: Your Lustre sources are older than the kernel patch
 884 #endif
 885 #else
 886 #warning "Lib Lustre - no versioning information"
 887 #endif
 888
 889 #ifdef __KERNEL__
 890 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
 891 MODULE_DESCRIPTION("Lustre Class Driver Build Version: " BUILD_VERSION);
 892 MODULE_LICENSE("GPL");
 893
 894 module_init(init_obdclass);
 895 module_exit(cleanup_obdclass);
 896 #endif