drivers/staging/lustre/lustre/obdclass/class_obd.c

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  *
  30  * Copyright (c) 2011, 2015, Intel Corporation.
  31  */
  32 /*
  33  * This file is part of Lustre, http://www.lustre.org/
  34  * Lustre is a trademark of Sun Microsystems, Inc.
  35  */
  36
  37 #define DEBUG_SUBSYSTEM S_CLASS
  38 # include <linux/atomic.h>
  39
  40 #include "../include/obd_support.h"
  41 #include "../include/obd_class.h"
  42 #include "../../include/linux/lnet/lnetctl.h"
  43 #include "../include/lustre_debug.h"
  44 #include "../include/lprocfs_status.h"
  45 #include <linux/list.h>
  46 #include "../include/cl_object.h"
  47 #include "llog_internal.h"
  48
  49 struct obd_device *obd_devs[MAX_OBD_DEVICES];
  50 EXPORT_SYMBOL(obd_devs);
  51 struct list_head obd_types;
  52 DEFINE_RWLOCK(obd_dev_lock);
  53
  54 /* The following are visible and mutable through /sys/fs/lustre. */
  55 unsigned int obd_debug_peer_on_timeout;
  56 EXPORT_SYMBOL(obd_debug_peer_on_timeout);
  57 unsigned int obd_dump_on_timeout;
  58 EXPORT_SYMBOL(obd_dump_on_timeout);
  59 unsigned int obd_dump_on_eviction;
  60 EXPORT_SYMBOL(obd_dump_on_eviction);
  61 unsigned int obd_max_dirty_pages = 256;
  62 EXPORT_SYMBOL(obd_max_dirty_pages);
  63 atomic_t obd_unstable_pages;
  64 EXPORT_SYMBOL(obd_unstable_pages);
  65 atomic_t obd_dirty_pages;
  66 EXPORT_SYMBOL(obd_dirty_pages);
  67 unsigned int obd_timeout = OBD_TIMEOUT_DEFAULT;   /* seconds */
  68 EXPORT_SYMBOL(obd_timeout);
  69 unsigned int obd_timeout_set;
  70 EXPORT_SYMBOL(obd_timeout_set);
  71 /* Adaptive timeout defs here instead of ptlrpc module for /sys/fs/ access */
  72 unsigned int at_min;
  73 EXPORT_SYMBOL(at_min);
  74 unsigned int at_max = 600;
  75 EXPORT_SYMBOL(at_max);
  76 unsigned int at_history = 600;
  77 EXPORT_SYMBOL(at_history);
  78 int at_early_margin = 5;
  79 EXPORT_SYMBOL(at_early_margin);
  80 int at_extra = 30;
  81 EXPORT_SYMBOL(at_extra);
  82
  83 atomic_t obd_dirty_transit_pages;
  84 EXPORT_SYMBOL(obd_dirty_transit_pages);
  85
  86 char obd_jobid_var[JOBSTATS_JOBID_VAR_MAX_LEN + 1] = JOBSTATS_DISABLE;
  87 EXPORT_SYMBOL(obd_jobid_var);
  88
  89 char obd_jobid_node[JOBSTATS_JOBID_SIZE + 1];
  90
  91 /* Get jobid of current process from stored variable or calculate
  92  * it from pid and user_id.
  93  *
  94  * Historically this was also done by reading the environment variable
  95  * stored in between the "env_start" & "env_end" of task struct.
  96  * This is now deprecated.
  97  */
  98 int lustre_get_jobid(char *jobid)
  99 {
 100         memset(jobid, 0, JOBSTATS_JOBID_SIZE);
 101         /* Jobstats isn't enabled */
 102         if (strcmp(obd_jobid_var, JOBSTATS_DISABLE) == 0)
 103                 return 0;
 104
 105         /* Use process name + fsuid as jobid */
 106         if (strcmp(obd_jobid_var, JOBSTATS_PROCNAME_UID) == 0) {
 107                 snprintf(jobid, JOBSTATS_JOBID_SIZE, "%s.%u",
 108                          current_comm(),
 109                          from_kuid(&init_user_ns, current_fsuid()));
 110                 return 0;
 111         }
 112
 113         /* Whole node dedicated to single job */
 114         if (strcmp(obd_jobid_var, JOBSTATS_NODELOCAL) == 0) {
 115                 strcpy(jobid, obd_jobid_node);
 116                 return 0;
 117         }
 118
 119         return -ENOENT;
 120 }
 121 EXPORT_SYMBOL(lustre_get_jobid);
 122
 123 static inline void obd_data2conn(struct lustre_handle *conn,
 124                                  struct obd_ioctl_data *data)
 125 {
 126         memset(conn, 0, sizeof(*conn));
 127         conn->cookie = data->ioc_cookie;
 128 }
 129
 130 static inline void obd_conn2data(struct obd_ioctl_data *data,
 131                                  struct lustre_handle *conn)
 132 {
 133         data->ioc_cookie = conn->cookie;
 134 }
 135
 136 static int class_resolve_dev_name(__u32 len, const char *name)
 137 {
 138         int rc;
 139         int dev;
 140
 141         if (!len || !name) {
 142                 CERROR("No name passed,!\n");
 143                 rc = -EINVAL;
 144                 goto out;
 145         }
 146         if (name[len - 1] != 0) {
 147                 CERROR("Name not nul terminated!\n");
 148                 rc = -EINVAL;
 149                 goto out;
 150         }
 151
 152         CDEBUG(D_IOCTL, "device name %s\n", name);
 153         dev = class_name2dev(name);
 154         if (dev == -1) {
 155                 CDEBUG(D_IOCTL, "No device for name %s!\n", name);
 156                 rc = -EINVAL;
 157                 goto out;
 158         }
 159
 160         CDEBUG(D_IOCTL, "device name %s, dev %d\n", name, dev);
 161         rc = dev;
 162
 163 out:
 164         return rc;
 165 }
 166
 167 int class_handle_ioctl(unsigned int cmd, unsigned long arg)
 168 {
 169         char *buf = NULL;
 170         struct obd_ioctl_data *data;
 171         struct libcfs_debug_ioctl_data *debug_data;
 172         struct obd_device *obd = NULL;
 173         int err = 0, len = 0;
 174
 175         /* only for debugging */
 176         if (cmd == LIBCFS_IOC_DEBUG_MASK) {
 177                 debug_data = (struct libcfs_debug_ioctl_data *)arg;
 178                 libcfs_subsystem_debug = debug_data->subs;
 179                 libcfs_debug = debug_data->debug;
 180                 return 0;
 181         }
 182
 183         CDEBUG(D_IOCTL, "cmd = %x\n", cmd);
 184         if (obd_ioctl_getdata(&buf, &len, (void __user *)arg)) {
 185                 CERROR("OBD ioctl: data error\n");
 186                 return -EINVAL;
 187         }
 188         data = (struct obd_ioctl_data *)buf;
 189
 190         switch (cmd) {
 191         case OBD_IOC_PROCESS_CFG: {
 192                 struct lustre_cfg *lcfg;
 193
 194                 if (!data->ioc_plen1 || !data->ioc_pbuf1) {
 195                         CERROR("No config buffer passed!\n");
 196                         err = -EINVAL;
 197                         goto out;
 198                 }
 199                 lcfg = kzalloc(data->ioc_plen1, GFP_NOFS);
 200                 if (!lcfg) {
 201                         err = -ENOMEM;
 202                         goto out;
 203                 }
 204                 err = copy_from_user(lcfg, data->ioc_pbuf1, data->ioc_plen1);
 205                 if (!err)
 206                         err = lustre_cfg_sanity_check(lcfg, data->ioc_plen1);
 207                 if (!err)
 208                         err = class_process_config(lcfg);
 209
 210                 kfree(lcfg);
 211                 goto out;
 212         }
 213
 214         case OBD_GET_VERSION:
 215                 if (!data->ioc_inlbuf1) {
 216                         CERROR("No buffer passed in ioctl\n");
 217                         err = -EINVAL;
 218                         goto out;
 219                 }
 220
 221                 if (strlen(LUSTRE_VERSION_STRING) + 1 > data->ioc_inllen1) {
 222                         CERROR("ioctl buffer too small to hold version\n");
 223                         err = -EINVAL;
 224                         goto out;
 225                 }
 226
 227                 memcpy(data->ioc_bulk, LUSTRE_VERSION_STRING,
 228                        strlen(LUSTRE_VERSION_STRING) + 1);
 229
 230                 err = obd_ioctl_popdata((void __user *)arg, data, len);
 231                 if (err)
 232                         err = -EFAULT;
 233                 goto out;
 234
 235         case OBD_IOC_NAME2DEV: {
 236                 /* Resolve a device name.  This does not change the
 237                  * currently selected device.
 238                  */
 239                 int dev;
 240
 241                 dev = class_resolve_dev_name(data->ioc_inllen1,
 242                                              data->ioc_inlbuf1);
 243                 data->ioc_dev = dev;
 244                 if (dev < 0) {
 245                         err = -EINVAL;
 246                         goto out;
 247                 }
 248
 249                 err = obd_ioctl_popdata((void __user *)arg, data,
 250                                         sizeof(*data));
 251                 if (err)
 252                         err = -EFAULT;
 253                 goto out;
 254         }
 255
 256         case OBD_IOC_UUID2DEV: {
 257                 /* Resolve a device uuid.  This does not change the
 258                  * currently selected device.
 259                  */
 260                 int dev;
 261                 struct obd_uuid uuid;
 262
 263                 if (!data->ioc_inllen1 || !data->ioc_inlbuf1) {
 264                         CERROR("No UUID passed!\n");
 265                         err = -EINVAL;
 266                         goto out;
 267                 }
 268                 if (data->ioc_inlbuf1[data->ioc_inllen1 - 1] != 0) {
 269                         CERROR("UUID not NUL terminated!\n");
 270                         err = -EINVAL;
 271                         goto out;
 272                 }
 273
 274                 CDEBUG(D_IOCTL, "device name %s\n", data->ioc_inlbuf1);
 275                 obd_str2uuid(&uuid, data->ioc_inlbuf1);
 276                 dev = class_uuid2dev(&uuid);
 277                 data->ioc_dev = dev;
 278                 if (dev == -1) {
 279                         CDEBUG(D_IOCTL, "No device for UUID %s!\n",
 280                                data->ioc_inlbuf1);
 281                         err = -EINVAL;
 282                         goto out;
 283                 }
 284
 285                 CDEBUG(D_IOCTL, "device name %s, dev %d\n", data->ioc_inlbuf1,
 286                        dev);
 287                 err = obd_ioctl_popdata((void __user *)arg, data,
 288                                         sizeof(*data));
 289                 if (err)
 290                         err = -EFAULT;
 291                 goto out;
 292         }
 293
 294         case OBD_IOC_CLOSE_UUID: {
 295                 CDEBUG(D_IOCTL, "closing all connections to uuid %s (NOOP)\n",
 296                        data->ioc_inlbuf1);
 297                 err = 0;
 298                 goto out;
 299         }
 300
 301         case OBD_IOC_GETDEVICE: {
 302                 int     index = data->ioc_count;
 303                 char    *status, *str;
 304
 305                 if (!data->ioc_inlbuf1) {
 306                         CERROR("No buffer passed in ioctl\n");
 307                         err = -EINVAL;
 308                         goto out;
 309                 }
 310                 if (data->ioc_inllen1 < 128) {
 311                         CERROR("ioctl buffer too small to hold version\n");
 312                         err = -EINVAL;
 313                         goto out;
 314                 }
 315
 316                 obd = class_num2obd(index);
 317                 if (!obd) {
 318                         err = -ENOENT;
 319                         goto out;
 320                 }
 321
 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                 str = (char *)data->ioc_bulk;
 331                 snprintf(str, len - sizeof(*data), "%3d %s %s %s %s %d",
 332                          (int)index, status, obd->obd_type->typ_name,
 333                          obd->obd_name, obd->obd_uuid.uuid,
 334                          atomic_read(&obd->obd_refcount));
 335                 err = obd_ioctl_popdata((void __user *)arg, data, len);
 336
 337                 err = 0;
 338                 goto out;
 339         }
 340         }
 341
 342         if (data->ioc_dev == OBD_DEV_BY_DEVNAME) {
 343                 if (data->ioc_inllen4 <= 0 || !data->ioc_inlbuf4) {
 344                         err = -EINVAL;
 345                         goto out;
 346                 }
 347                 if (strnlen(data->ioc_inlbuf4, MAX_OBD_NAME) >= MAX_OBD_NAME) {
 348                         err = -EINVAL;
 349                         goto out;
 350                 }
 351                 obd = class_name2obd(data->ioc_inlbuf4);
 352         } else if (data->ioc_dev < class_devno_max()) {
 353                 obd = class_num2obd(data->ioc_dev);
 354         } else {
 355                 CERROR("OBD ioctl: No device\n");
 356                 err = -EINVAL;
 357                 goto out;
 358         }
 359
 360         if (!obd) {
 361                 CERROR("OBD ioctl : No Device %d\n", data->ioc_dev);
 362                 err = -EINVAL;
 363                 goto out;
 364         }
 365         LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
 366
 367         if (!obd->obd_set_up || obd->obd_stopping) {
 368                 CERROR("OBD ioctl: device not setup %d\n", data->ioc_dev);
 369                 err = -EINVAL;
 370                 goto out;
 371         }
 372
 373         switch (cmd) {
 374         case OBD_IOC_NO_TRANSNO: {
 375                 if (!obd->obd_attached) {
 376                         CERROR("Device %d not attached\n", obd->obd_minor);
 377                         err = -ENODEV;
 378                         goto out;
 379                 }
 380                 CDEBUG(D_HA, "%s: disabling committed-transno notification\n",
 381                        obd->obd_name);
 382                 obd->obd_no_transno = 1;
 383                 err = 0;
 384                 goto out;
 385         }
 386
 387         default: {
 388                 err = obd_iocontrol(cmd, obd->obd_self_export, len, data, NULL);
 389                 if (err)
 390                         goto out;
 391
 392                 err = obd_ioctl_popdata((void __user *)arg, data, len);
 393                 if (err)
 394                         err = -EFAULT;
 395                 goto out;
 396         }
 397         }
 398
 399  out:
 400         if (buf)
 401                 obd_ioctl_freedata(buf, len);
 402         return err;
 403 } /* class_handle_ioctl */
 404
 405 #define OBD_INIT_CHECK
 406 static int obd_init_checks(void)
 407 {
 408         __u64 u64val, div64val;
 409         char buf[64];
 410         int len, ret = 0;
 411
 412         CDEBUG(D_INFO, "LPU64=%s, LPD64=%s, LPX64=%s\n", "%llu", "%lld", "%#llx");
 413
 414         CDEBUG(D_INFO, "OBD_OBJECT_EOF = %#llx\n", (__u64)OBD_OBJECT_EOF);
 415
 416         u64val = OBD_OBJECT_EOF;
 417         CDEBUG(D_INFO, "u64val OBD_OBJECT_EOF = %#llx\n", u64val);
 418         if (u64val != OBD_OBJECT_EOF) {
 419                 CERROR("__u64 %#llx(%d) != 0xffffffffffffffff\n",
 420                        u64val, (int)sizeof(u64val));
 421                 ret = -EINVAL;
 422         }
 423         len = snprintf(buf, sizeof(buf), "%#llx", u64val);
 424         if (len != 18) {
 425                 CWARN("LPX64 wrong length! strlen(%s)=%d != 18\n", buf, len);
 426                 ret = -EINVAL;
 427         }
 428
 429         div64val = OBD_OBJECT_EOF;
 430         CDEBUG(D_INFO, "u64val OBD_OBJECT_EOF = %#llx\n", u64val);
 431         if (u64val != OBD_OBJECT_EOF) {
 432                 CERROR("__u64 %#llx(%d) != 0xffffffffffffffff\n",
 433                        u64val, (int)sizeof(u64val));
 434                 ret = -EOVERFLOW;
 435         }
 436         if (u64val >> 8 != OBD_OBJECT_EOF >> 8) {
 437                 CERROR("__u64 %#llx(%d) != 0xffffffffffffffff\n",
 438                        u64val, (int)sizeof(u64val));
 439                 return -EOVERFLOW;
 440         }
 441         if (do_div(div64val, 256) != (u64val & 255)) {
 442                 CERROR("do_div(%#llx,256) != %llu\n", u64val, u64val & 255);
 443                 return -EOVERFLOW;
 444         }
 445         if (u64val >> 8 != div64val) {
 446                 CERROR("do_div(%#llx,256) %llu != %llu\n",
 447                        u64val, div64val, u64val >> 8);
 448                 return -EOVERFLOW;
 449         }
 450         len = snprintf(buf, sizeof(buf), "%#llx", u64val);
 451         if (len != 18) {
 452                 CWARN("LPX64 wrong length! strlen(%s)=%d != 18\n", buf, len);
 453                 ret = -EINVAL;
 454         }
 455         len = snprintf(buf, sizeof(buf), "%llu", u64val);
 456         if (len != 20) {
 457                 CWARN("LPU64 wrong length! strlen(%s)=%d != 20\n", buf, len);
 458                 ret = -EINVAL;
 459         }
 460         len = snprintf(buf, sizeof(buf), "%lld", u64val);
 461         if (len != 2) {
 462                 CWARN("LPD64 wrong length! strlen(%s)=%d != 2\n", buf, len);
 463                 ret = -EINVAL;
 464         }
 465         if ((u64val & ~PAGE_MASK) >= PAGE_SIZE) {
 466                 CWARN("mask failed: u64val %llu >= %llu\n", u64val,
 467                       (__u64)PAGE_SIZE);
 468                 ret = -EINVAL;
 469         }
 470
 471         return ret;
 472 }
 473
 474 extern int class_procfs_init(void);
 475 extern int class_procfs_clean(void);
 476
 477 static int __init obdclass_init(void)
 478 {
 479         int i, err;
 480
 481         int lustre_register_fs(void);
 482
 483         LCONSOLE_INFO("Lustre: Build Version: " LUSTRE_VERSION_STRING "\n");
 484
 485         spin_lock_init(&obd_types_lock);
 486         obd_zombie_impexp_init();
 487
 488         err = obd_init_checks();
 489         if (err == -EOVERFLOW)
 490                 return err;
 491
 492         class_init_uuidlist();
 493         err = class_handle_init();
 494         if (err)
 495                 return err;
 496
 497         INIT_LIST_HEAD(&obd_types);
 498
 499         err = misc_register(&obd_psdev);
 500         if (err) {
 501                 CERROR("cannot register %d err %d\n", OBD_DEV_MINOR, err);
 502                 return err;
 503         }
 504
 505         /* This struct is already zeroed for us (static global) */
 506         for (i = 0; i < class_devno_max(); i++)
 507                 obd_devs[i] = NULL;
 508
 509         /* Default the dirty page cache cap to 1/2 of system memory.
 510          * For clients with less memory, a larger fraction is needed
 511          * for other purposes (mostly for BGL).
 512          */
 513         if (totalram_pages <= 512 << (20 - PAGE_SHIFT))
 514                 obd_max_dirty_pages = totalram_pages / 4;
 515         else
 516                 obd_max_dirty_pages = totalram_pages / 2;
 517
 518         err = obd_init_caches();
 519         if (err)
 520                 return err;
 521
 522         err = class_procfs_init();
 523         if (err)
 524                 return err;
 525
 526         err = obd_sysctl_init();
 527         if (err)
 528                 return err;
 529
 530         err = lu_global_init();
 531         if (err)
 532                 return err;
 533
 534         err = cl_global_init();
 535         if (err != 0)
 536                 return err;
 537
 538         err = llog_info_init();
 539         if (err)
 540                 return err;
 541
 542         err = lustre_register_fs();
 543
 544         return err;
 545 }
 546
 547 static void obdclass_exit(void)
 548 {
 549         int i;
 550
 551         int lustre_unregister_fs(void);
 552
 553         lustre_unregister_fs();
 554
 555         misc_deregister(&obd_psdev);
 556         for (i = 0; i < class_devno_max(); i++) {
 557                 struct obd_device *obd = class_num2obd(i);
 558
 559                 if (obd && obd->obd_set_up &&
 560                     OBT(obd) && OBP(obd, detach)) {
 561                         /* XXX should this call generic detach otherwise? */
 562                         LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
 563                         OBP(obd, detach)(obd);
 564                 }
 565         }
 566         llog_info_fini();
 567         cl_global_fini();
 568         lu_global_fini();
 569
 570         obd_cleanup_caches();
 571
 572         class_procfs_clean();
 573
 574         class_handle_cleanup();
 575         class_exit_uuidlist();
 576         obd_zombie_impexp_stop();
 577 }
 578
 579 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
 580 MODULE_DESCRIPTION("Lustre Class Driver");
 581 MODULE_VERSION(LUSTRE_VERSION_STRING);
 582 MODULE_LICENSE("GPL");
 583
 584 module_init(obdclass_init);
 585 module_exit(obdclass_exit);