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.gnu.org/licenses/gpl-2.0.html
  19  *
  20  * GPL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Use is subject to license terms.
  25  *
  26  * Copyright (c) 2011, 2015, Intel Corporation.
  27  */
  28 /*
  29  * This file is part of Lustre, http://www.lustre.org/
  30  * Lustre is a trademark of Sun Microsystems, Inc.
  31  */
  32
  33 #define DEBUG_SUBSYSTEM S_CLASS
  34 # include <linux/atomic.h>
  35
  36 #include "../include/obd_support.h"
  37 #include "../include/obd_class.h"
  38 #include "../../include/linux/lnet/lnetctl.h"
  39 #include "../include/lustre_debug.h"
  40 #include "../include/lprocfs_status.h"
  41 #include <linux/list.h>
  42 #include "../include/cl_object.h"
  43 #include "../include/lustre/lustre_ioctl.h"
  44 #include "llog_internal.h"
  45
  46 struct obd_device *obd_devs[MAX_OBD_DEVICES];
  47 EXPORT_SYMBOL(obd_devs);
  48 struct list_head obd_types;
  49 DEFINE_RWLOCK(obd_dev_lock);
  50
  51 /* The following are visible and mutable through /sys/fs/lustre. */
  52 unsigned int obd_debug_peer_on_timeout;
  53 EXPORT_SYMBOL(obd_debug_peer_on_timeout);
  54 unsigned int obd_dump_on_timeout;
  55 EXPORT_SYMBOL(obd_dump_on_timeout);
  56 unsigned int obd_dump_on_eviction;
  57 EXPORT_SYMBOL(obd_dump_on_eviction);
  58 unsigned int obd_max_dirty_pages = 256;
  59 EXPORT_SYMBOL(obd_max_dirty_pages);
  60 atomic_t obd_dirty_pages;
  61 EXPORT_SYMBOL(obd_dirty_pages);
  62 unsigned int obd_timeout = OBD_TIMEOUT_DEFAULT;   /* seconds */
  63 EXPORT_SYMBOL(obd_timeout);
  64 unsigned int obd_timeout_set;
  65 EXPORT_SYMBOL(obd_timeout_set);
  66 /* Adaptive timeout defs here instead of ptlrpc module for /sys/fs/ access */
  67 unsigned int at_min;
  68 EXPORT_SYMBOL(at_min);
  69 unsigned int at_max = 600;
  70 EXPORT_SYMBOL(at_max);
  71 unsigned int at_history = 600;
  72 EXPORT_SYMBOL(at_history);
  73 int at_early_margin = 5;
  74 EXPORT_SYMBOL(at_early_margin);
  75 int at_extra = 30;
  76 EXPORT_SYMBOL(at_extra);
  77
  78 atomic_t obd_dirty_transit_pages;
  79 EXPORT_SYMBOL(obd_dirty_transit_pages);
  80
  81 char obd_jobid_var[JOBSTATS_JOBID_VAR_MAX_LEN + 1] = JOBSTATS_DISABLE;
  82 EXPORT_SYMBOL(obd_jobid_var);
  83
  84 char obd_jobid_node[JOBSTATS_JOBID_SIZE + 1];
  85
  86 /* Get jobid of current process from stored variable or calculate
  87  * it from pid and user_id.
  88  *
  89  * Historically this was also done by reading the environment variable
  90  * stored in between the "env_start" & "env_end" of task struct.
  91  * This is now deprecated.
  92  */
  93 int lustre_get_jobid(char *jobid)
  94 {
  95         memset(jobid, 0, JOBSTATS_JOBID_SIZE);
  96         /* Jobstats isn't enabled */
  97         if (strcmp(obd_jobid_var, JOBSTATS_DISABLE) == 0)
  98                 return 0;
  99
 100         /* Use process name + fsuid as jobid */
 101         if (strcmp(obd_jobid_var, JOBSTATS_PROCNAME_UID) == 0) {
 102                 snprintf(jobid, JOBSTATS_JOBID_SIZE, "%s.%u",
 103                          current_comm(),
 104                          from_kuid(&init_user_ns, current_fsuid()));
 105                 return 0;
 106         }
 107
 108         /* Whole node dedicated to single job */
 109         if (strcmp(obd_jobid_var, JOBSTATS_NODELOCAL) == 0) {
 110                 strcpy(jobid, obd_jobid_node);
 111                 return 0;
 112         }
 113
 114         return -ENOENT;
 115 }
 116 EXPORT_SYMBOL(lustre_get_jobid);
 117
 118 static int class_resolve_dev_name(__u32 len, const char *name)
 119 {
 120         int rc;
 121         int dev;
 122
 123         if (!len || !name) {
 124                 CERROR("No name passed,!\n");
 125                 rc = -EINVAL;
 126                 goto out;
 127         }
 128         if (name[len - 1] != 0) {
 129                 CERROR("Name not nul terminated!\n");
 130                 rc = -EINVAL;
 131                 goto out;
 132         }
 133
 134         CDEBUG(D_IOCTL, "device name %s\n", name);
 135         dev = class_name2dev(name);
 136         if (dev == -1) {
 137                 CDEBUG(D_IOCTL, "No device for name %s!\n", name);
 138                 rc = -EINVAL;
 139                 goto out;
 140         }
 141
 142         CDEBUG(D_IOCTL, "device name %s, dev %d\n", name, dev);
 143         rc = dev;
 144
 145 out:
 146         return rc;
 147 }
 148
 149 int class_handle_ioctl(unsigned int cmd, unsigned long arg)
 150 {
 151         char *buf = NULL;
 152         struct obd_ioctl_data *data;
 153         struct libcfs_debug_ioctl_data *debug_data;
 154         struct obd_device *obd = NULL;
 155         int err = 0, len = 0;
 156
 157         /* only for debugging */
 158         if (cmd == LIBCFS_IOC_DEBUG_MASK) {
 159                 debug_data = (struct libcfs_debug_ioctl_data *)arg;
 160                 libcfs_subsystem_debug = debug_data->subs;
 161                 libcfs_debug = debug_data->debug;
 162                 return 0;
 163         }
 164
 165         CDEBUG(D_IOCTL, "cmd = %x\n", cmd);
 166         if (obd_ioctl_getdata(&buf, &len, (void __user *)arg)) {
 167                 CERROR("OBD ioctl: data error\n");
 168                 return -EINVAL;
 169         }
 170         data = (struct obd_ioctl_data *)buf;
 171
 172         switch (cmd) {
 173         case OBD_IOC_PROCESS_CFG: {
 174                 struct lustre_cfg *lcfg;
 175
 176                 if (!data->ioc_plen1 || !data->ioc_pbuf1) {
 177                         CERROR("No config buffer passed!\n");
 178                         err = -EINVAL;
 179                         goto out;
 180                 }
 181                 lcfg = kzalloc(data->ioc_plen1, GFP_NOFS);
 182                 if (!lcfg) {
 183                         err = -ENOMEM;
 184                         goto out;
 185                 }
 186                 err = copy_from_user(lcfg, data->ioc_pbuf1, data->ioc_plen1);
 187                 if (!err)
 188                         err = lustre_cfg_sanity_check(lcfg, data->ioc_plen1);
 189                 if (!err)
 190                         err = class_process_config(lcfg);
 191
 192                 kfree(lcfg);
 193                 goto out;
 194         }
 195
 196         case OBD_GET_VERSION:
 197                 if (!data->ioc_inlbuf1) {
 198                         CERROR("No buffer passed in ioctl\n");
 199                         err = -EINVAL;
 200                         goto out;
 201                 }
 202
 203                 if (strlen(LUSTRE_VERSION_STRING) + 1 > data->ioc_inllen1) {
 204                         CERROR("ioctl buffer too small to hold version\n");
 205                         err = -EINVAL;
 206                         goto out;
 207                 }
 208
 209                 memcpy(data->ioc_bulk, LUSTRE_VERSION_STRING,
 210                        strlen(LUSTRE_VERSION_STRING) + 1);
 211
 212                 err = obd_ioctl_popdata((void __user *)arg, data, len);
 213                 if (err)
 214                         err = -EFAULT;
 215                 goto out;
 216
 217         case OBD_IOC_NAME2DEV: {
 218                 /* Resolve a device name.  This does not change the
 219                  * currently selected device.
 220                  */
 221                 int dev;
 222
 223                 dev = class_resolve_dev_name(data->ioc_inllen1,
 224                                              data->ioc_inlbuf1);
 225                 data->ioc_dev = dev;
 226                 if (dev < 0) {
 227                         err = -EINVAL;
 228                         goto out;
 229                 }
 230
 231                 err = obd_ioctl_popdata((void __user *)arg, data,
 232                                         sizeof(*data));
 233                 if (err)
 234                         err = -EFAULT;
 235                 goto out;
 236         }
 237
 238         case OBD_IOC_UUID2DEV: {
 239                 /* Resolve a device uuid.  This does not change the
 240                  * currently selected device.
 241                  */
 242                 int dev;
 243                 struct obd_uuid uuid;
 244
 245                 if (!data->ioc_inllen1 || !data->ioc_inlbuf1) {
 246                         CERROR("No UUID passed!\n");
 247                         err = -EINVAL;
 248                         goto out;
 249                 }
 250                 if (data->ioc_inlbuf1[data->ioc_inllen1 - 1] != 0) {
 251                         CERROR("UUID not NUL terminated!\n");
 252                         err = -EINVAL;
 253                         goto out;
 254                 }
 255
 256                 CDEBUG(D_IOCTL, "device name %s\n", data->ioc_inlbuf1);
 257                 obd_str2uuid(&uuid, data->ioc_inlbuf1);
 258                 dev = class_uuid2dev(&uuid);
 259                 data->ioc_dev = dev;
 260                 if (dev == -1) {
 261                         CDEBUG(D_IOCTL, "No device for UUID %s!\n",
 262                                data->ioc_inlbuf1);
 263                         err = -EINVAL;
 264                         goto out;
 265                 }
 266
 267                 CDEBUG(D_IOCTL, "device name %s, dev %d\n", data->ioc_inlbuf1,
 268                        dev);
 269                 err = obd_ioctl_popdata((void __user *)arg, data,
 270                                         sizeof(*data));
 271                 if (err)
 272                         err = -EFAULT;
 273                 goto out;
 274         }
 275
 276         case OBD_IOC_GETDEVICE: {
 277                 int     index = data->ioc_count;
 278                 char    *status, *str;
 279
 280                 if (!data->ioc_inlbuf1) {
 281                         CERROR("No buffer passed in ioctl\n");
 282                         err = -EINVAL;
 283                         goto out;
 284                 }
 285                 if (data->ioc_inllen1 < 128) {
 286                         CERROR("ioctl buffer too small to hold version\n");
 287                         err = -EINVAL;
 288                         goto out;
 289                 }
 290
 291                 obd = class_num2obd(index);
 292                 if (!obd) {
 293                         err = -ENOENT;
 294                         goto out;
 295                 }
 296
 297                 if (obd->obd_stopping)
 298                         status = "ST";
 299                 else if (obd->obd_set_up)
 300                         status = "UP";
 301                 else if (obd->obd_attached)
 302                         status = "AT";
 303                 else
 304                         status = "--";
 305                 str = (char *)data->ioc_bulk;
 306                 snprintf(str, len - sizeof(*data), "%3d %s %s %s %s %d",
 307                          (int)index, status, obd->obd_type->typ_name,
 308                          obd->obd_name, obd->obd_uuid.uuid,
 309                          atomic_read(&obd->obd_refcount));
 310                 err = obd_ioctl_popdata((void __user *)arg, data, len);
 311
 312                 err = 0;
 313                 goto out;
 314         }
 315         }
 316
 317         if (data->ioc_dev == OBD_DEV_BY_DEVNAME) {
 318                 if (data->ioc_inllen4 <= 0 || !data->ioc_inlbuf4) {
 319                         err = -EINVAL;
 320                         goto out;
 321                 }
 322                 if (strnlen(data->ioc_inlbuf4, MAX_OBD_NAME) >= MAX_OBD_NAME) {
 323                         err = -EINVAL;
 324                         goto out;
 325                 }
 326                 obd = class_name2obd(data->ioc_inlbuf4);
 327         } else if (data->ioc_dev < class_devno_max()) {
 328                 obd = class_num2obd(data->ioc_dev);
 329         } else {
 330                 CERROR("OBD ioctl: No device\n");
 331                 err = -EINVAL;
 332                 goto out;
 333         }
 334
 335         if (!obd) {
 336                 CERROR("OBD ioctl : No Device %d\n", data->ioc_dev);
 337                 err = -EINVAL;
 338                 goto out;
 339         }
 340         LASSERT(obd->obd_magic == OBD_DEVICE_MAGIC);
 341
 342         if (!obd->obd_set_up || obd->obd_stopping) {
 343                 CERROR("OBD ioctl: device not setup %d\n", data->ioc_dev);
 344                 err = -EINVAL;
 345                 goto out;
 346         }
 347
 348         switch (cmd) {
 349         case OBD_IOC_NO_TRANSNO: {
 350                 if (!obd->obd_attached) {
 351                         CERROR("Device %d not attached\n", obd->obd_minor);
 352                         err = -ENODEV;
 353                         goto out;
 354                 }
 355                 CDEBUG(D_HA, "%s: disabling committed-transno notification\n",
 356                        obd->obd_name);
 357                 obd->obd_no_transno = 1;
 358                 err = 0;
 359                 goto out;
 360         }
 361
 362         default: {
 363                 err = obd_iocontrol(cmd, obd->obd_self_export, len, data, NULL);
 364                 if (err)
 365                         goto out;
 366
 367                 err = obd_ioctl_popdata((void __user *)arg, data, len);
 368                 if (err)
 369                         err = -EFAULT;
 370                 goto out;
 371         }
 372         }
 373
 374  out:
 375         if (buf)
 376                 obd_ioctl_freedata(buf, len);
 377         return err;
 378 } /* class_handle_ioctl */
 379
 380 #define OBD_INIT_CHECK
 381 static int obd_init_checks(void)
 382 {
 383         __u64 u64val, div64val;
 384         char buf[64];
 385         int len, ret = 0;
 386
 387         CDEBUG(D_INFO, "LPU64=%s, LPD64=%s, LPX64=%s\n", "%llu", "%lld", "%#llx");
 388
 389         CDEBUG(D_INFO, "OBD_OBJECT_EOF = %#llx\n", (__u64)OBD_OBJECT_EOF);
 390
 391         u64val = OBD_OBJECT_EOF;
 392         CDEBUG(D_INFO, "u64val OBD_OBJECT_EOF = %#llx\n", u64val);
 393         if (u64val != OBD_OBJECT_EOF) {
 394                 CERROR("__u64 %#llx(%d) != 0xffffffffffffffff\n",
 395                        u64val, (int)sizeof(u64val));
 396                 ret = -EINVAL;
 397         }
 398         len = snprintf(buf, sizeof(buf), "%#llx", u64val);
 399         if (len != 18) {
 400                 CWARN("LPX64 wrong length! strlen(%s)=%d != 18\n", buf, len);
 401                 ret = -EINVAL;
 402         }
 403
 404         div64val = OBD_OBJECT_EOF;
 405         CDEBUG(D_INFO, "u64val OBD_OBJECT_EOF = %#llx\n", u64val);
 406         if (u64val != OBD_OBJECT_EOF) {
 407                 CERROR("__u64 %#llx(%d) != 0xffffffffffffffff\n",
 408                        u64val, (int)sizeof(u64val));
 409                 ret = -EOVERFLOW;
 410         }
 411         if (u64val >> 8 != OBD_OBJECT_EOF >> 8) {
 412                 CERROR("__u64 %#llx(%d) != 0xffffffffffffffff\n",
 413                        u64val, (int)sizeof(u64val));
 414                 return -EOVERFLOW;
 415         }
 416         if (do_div(div64val, 256) != (u64val & 255)) {
 417                 CERROR("do_div(%#llx,256) != %llu\n", u64val, u64val & 255);
 418                 return -EOVERFLOW;
 419         }
 420         if (u64val >> 8 != div64val) {
 421                 CERROR("do_div(%#llx,256) %llu != %llu\n",
 422                        u64val, div64val, u64val >> 8);
 423                 return -EOVERFLOW;
 424         }
 425         len = snprintf(buf, sizeof(buf), "%#llx", u64val);
 426         if (len != 18) {
 427                 CWARN("LPX64 wrong length! strlen(%s)=%d != 18\n", buf, len);
 428                 ret = -EINVAL;
 429         }
 430         len = snprintf(buf, sizeof(buf), "%llu", u64val);
 431         if (len != 20) {
 432                 CWARN("LPU64 wrong length! strlen(%s)=%d != 20\n", buf, len);
 433                 ret = -EINVAL;
 434         }
 435         len = snprintf(buf, sizeof(buf), "%lld", u64val);
 436         if (len != 2) {
 437                 CWARN("LPD64 wrong length! strlen(%s)=%d != 2\n", buf, len);
 438                 ret = -EINVAL;
 439         }
 440         if ((u64val & ~PAGE_MASK) >= PAGE_SIZE) {
 441                 CWARN("mask failed: u64val %llu >= %llu\n", u64val,
 442                       (__u64)PAGE_SIZE);
 443                 ret = -EINVAL;
 444         }
 445
 446         return ret;
 447 }
 448
 449 static int __init obdclass_init(void)
 450 {
 451         int i, err;
 452
 453         int lustre_register_fs(void);
 454
 455         LCONSOLE_INFO("Lustre: Build Version: " LUSTRE_VERSION_STRING "\n");
 456
 457         spin_lock_init(&obd_types_lock);
 458         obd_zombie_impexp_init();
 459
 460         err = obd_init_checks();
 461         if (err == -EOVERFLOW)
 462                 return err;
 463
 464         class_init_uuidlist();
 465         err = class_handle_init();
 466         if (err)
 467                 return err;
 468
 469         INIT_LIST_HEAD(&obd_types);
 470
 471         err = misc_register(&obd_psdev);
 472         if (err) {
 473                 CERROR("cannot register %d err %d\n", OBD_DEV_MINOR, err);
 474                 return err;
 475         }
 476
 477         /* This struct is already zeroed for us (static global) */
 478         for (i = 0; i < class_devno_max(); i++)
 479                 obd_devs[i] = NULL;
 480
 481         /* Default the dirty page cache cap to 1/2 of system memory.
 482          * For clients with less memory, a larger fraction is needed
 483          * for other purposes (mostly for BGL).
 484          */
 485         if (totalram_pages <= 512 << (20 - PAGE_SHIFT))
 486                 obd_max_dirty_pages = totalram_pages / 4;
 487         else
 488                 obd_max_dirty_pages = totalram_pages / 2;
 489
 490         err = obd_init_caches();
 491         if (err)
 492                 return err;
 493
 494         err = class_procfs_init();
 495         if (err)
 496                 return err;
 497
 498         err = obd_sysctl_init();
 499         if (err)
 500                 return err;
 501
 502         err = lu_global_init();
 503         if (err)
 504                 return err;
 505
 506         err = cl_global_init();
 507         if (err != 0)
 508                 return err;
 509
 510         err = llog_info_init();
 511         if (err)
 512                 return err;
 513
 514         err = lustre_register_fs();
 515
 516         return err;
 517 }
 518
 519 static void obdclass_exit(void)
 520 {
 521         int lustre_unregister_fs(void);
 522
 523         lustre_unregister_fs();
 524
 525         misc_deregister(&obd_psdev);
 526         llog_info_fini();
 527         cl_global_fini();
 528         lu_global_fini();
 529
 530         obd_cleanup_caches();
 531
 532         class_procfs_clean();
 533
 534         class_handle_cleanup();
 535         class_exit_uuidlist();
 536         obd_zombie_impexp_stop();
 537 }
 538
 539 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
 540 MODULE_DESCRIPTION("Lustre Class Driver");
 541 MODULE_VERSION(LUSTRE_VERSION_STRING);
 542 MODULE_LICENSE("GPL");
 543
 544 module_init(obdclass_init);
 545 module_exit(obdclass_exit);