fs/xfs/xfs_sysfs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2014 Red Hat, Inc.
   4  * All Rights Reserved.
   5  */
   6
   7 #include "xfs.h"
   8 #include "xfs_shared.h"
   9 #include "xfs_format.h"
  10 #include "xfs_log_format.h"
  11 #include "xfs_trans_resv.h"
  12 #include "xfs_sysfs.h"
  13 #include "xfs_log.h"
  14 #include "xfs_log_priv.h"
  15 #include "xfs_mount.h"
  16
  17 struct xfs_sysfs_attr {
  18         struct attribute attr;
  19         ssize_t (*show)(struct kobject *kobject, char *buf);
  20         ssize_t (*store)(struct kobject *kobject, const char *buf,
  21                          size_t count);
  22 };
  23
  24 static inline struct xfs_sysfs_attr *
  25 to_attr(struct attribute *attr)
  26 {
  27         return container_of(attr, struct xfs_sysfs_attr, attr);
  28 }
  29
  30 #define XFS_SYSFS_ATTR_RW(name) \
  31         static struct xfs_sysfs_attr xfs_sysfs_attr_##name = __ATTR_RW(name)
  32 #define XFS_SYSFS_ATTR_RO(name) \
  33         static struct xfs_sysfs_attr xfs_sysfs_attr_##name = __ATTR_RO(name)
  34 #define XFS_SYSFS_ATTR_WO(name) \
  35         static struct xfs_sysfs_attr xfs_sysfs_attr_##name = __ATTR_WO(name)
  36
  37 #define ATTR_LIST(name) &xfs_sysfs_attr_##name.attr
  38
  39 STATIC ssize_t
  40 xfs_sysfs_object_show(
  41         struct kobject          *kobject,
  42         struct attribute        *attr,
  43         char                    *buf)
  44 {
  45         struct xfs_sysfs_attr *xfs_attr = to_attr(attr);
  46
  47         return xfs_attr->show ? xfs_attr->show(kobject, buf) : 0;
  48 }
  49
  50 STATIC ssize_t
  51 xfs_sysfs_object_store(
  52         struct kobject          *kobject,
  53         struct attribute        *attr,
  54         const char              *buf,
  55         size_t                  count)
  56 {
  57         struct xfs_sysfs_attr *xfs_attr = to_attr(attr);
  58
  59         return xfs_attr->store ? xfs_attr->store(kobject, buf, count) : 0;
  60 }
  61
  62 static const struct sysfs_ops xfs_sysfs_ops = {
  63         .show = xfs_sysfs_object_show,
  64         .store = xfs_sysfs_object_store,
  65 };
  66
  67 static struct attribute *xfs_mp_attrs[] = {
  68         NULL,
  69 };
  70 ATTRIBUTE_GROUPS(xfs_mp);
  71
  72 const struct kobj_type xfs_mp_ktype = {
  73         .release = xfs_sysfs_release,
  74         .sysfs_ops = &xfs_sysfs_ops,
  75         .default_groups = xfs_mp_groups,
  76 };
  77
  78 #ifdef DEBUG
  79 /* debug */
  80
  81 STATIC ssize_t
  82 bug_on_assert_store(
  83         struct kobject          *kobject,
  84         const char              *buf,
  85         size_t                  count)
  86 {
  87         int                     ret;
  88         int                     val;
  89
  90         ret = kstrtoint(buf, 0, &val);
  91         if (ret)
  92                 return ret;
  93
  94         if (val == 1)
  95                 xfs_globals.bug_on_assert = true;
  96         else if (val == 0)
  97                 xfs_globals.bug_on_assert = false;
  98         else
  99                 return -EINVAL;
 100
 101         return count;
 102 }
 103
 104 STATIC ssize_t
 105 bug_on_assert_show(
 106         struct kobject          *kobject,
 107         char                    *buf)
 108 {
 109         return sysfs_emit(buf, "%d\n", xfs_globals.bug_on_assert);
 110 }
 111 XFS_SYSFS_ATTR_RW(bug_on_assert);
 112
 113 STATIC ssize_t
 114 log_recovery_delay_store(
 115         struct kobject  *kobject,
 116         const char      *buf,
 117         size_t          count)
 118 {
 119         int             ret;
 120         int             val;
 121
 122         ret = kstrtoint(buf, 0, &val);
 123         if (ret)
 124                 return ret;
 125
 126         if (val < 0 || val > 60)
 127                 return -EINVAL;
 128
 129         xfs_globals.log_recovery_delay = val;
 130
 131         return count;
 132 }
 133
 134 STATIC ssize_t
 135 log_recovery_delay_show(
 136         struct kobject  *kobject,
 137         char            *buf)
 138 {
 139         return sysfs_emit(buf, "%d\n", xfs_globals.log_recovery_delay);
 140 }
 141 XFS_SYSFS_ATTR_RW(log_recovery_delay);
 142
 143 STATIC ssize_t
 144 mount_delay_store(
 145         struct kobject  *kobject,
 146         const char      *buf,
 147         size_t          count)
 148 {
 149         int             ret;
 150         int             val;
 151
 152         ret = kstrtoint(buf, 0, &val);
 153         if (ret)
 154                 return ret;
 155
 156         if (val < 0 || val > 60)
 157                 return -EINVAL;
 158
 159         xfs_globals.mount_delay = val;
 160
 161         return count;
 162 }
 163
 164 STATIC ssize_t
 165 mount_delay_show(
 166         struct kobject  *kobject,
 167         char            *buf)
 168 {
 169         return sysfs_emit(buf, "%d\n", xfs_globals.mount_delay);
 170 }
 171 XFS_SYSFS_ATTR_RW(mount_delay);
 172
 173 static ssize_t
 174 always_cow_store(
 175         struct kobject  *kobject,
 176         const char      *buf,
 177         size_t          count)
 178 {
 179         ssize_t         ret;
 180
 181         ret = kstrtobool(buf, &xfs_globals.always_cow);
 182         if (ret < 0)
 183                 return ret;
 184         return count;
 185 }
 186
 187 static ssize_t
 188 always_cow_show(
 189         struct kobject  *kobject,
 190         char            *buf)
 191 {
 192         return sysfs_emit(buf, "%d\n", xfs_globals.always_cow);
 193 }
 194 XFS_SYSFS_ATTR_RW(always_cow);
 195
 196 /*
 197  * Override how many threads the parallel work queue is allowed to create.
 198  * This has to be a debug-only global (instead of an errortag) because one of
 199  * the main users of parallel workqueues is mount time quotacheck.
 200  */
 201 STATIC ssize_t
 202 pwork_threads_store(
 203         struct kobject  *kobject,
 204         const char      *buf,
 205         size_t          count)
 206 {
 207         int             ret;
 208         int             val;
 209
 210         ret = kstrtoint(buf, 0, &val);
 211         if (ret)
 212                 return ret;
 213
 214         if (val < -1 || val > num_possible_cpus())
 215                 return -EINVAL;
 216
 217         xfs_globals.pwork_threads = val;
 218
 219         return count;
 220 }
 221
 222 STATIC ssize_t
 223 pwork_threads_show(
 224         struct kobject  *kobject,
 225         char            *buf)
 226 {
 227         return sysfs_emit(buf, "%d\n", xfs_globals.pwork_threads);
 228 }
 229 XFS_SYSFS_ATTR_RW(pwork_threads);
 230
 231 /*
 232  * The "LARP" (Logged extended Attribute Recovery Persistence) debugging knob
 233  * sets the XFS_DA_OP_LOGGED flag on all xfs_attr_set operations performed on
 234  * V5 filesystems.  As a result, the intermediate progress of all setxattr and
 235  * removexattr operations are tracked via the log and can be restarted during
 236  * recovery.  This is useful for testing xattr recovery prior to merging of the
 237  * parent pointer feature which requires it to maintain consistency, and may be
 238  * enabled for userspace xattrs in the future.
 239  */
 240 static ssize_t
 241 larp_store(
 242         struct kobject  *kobject,
 243         const char      *buf,
 244         size_t          count)
 245 {
 246         ssize_t         ret;
 247
 248         ret = kstrtobool(buf, &xfs_globals.larp);
 249         if (ret < 0)
 250                 return ret;
 251         return count;
 252 }
 253
 254 STATIC ssize_t
 255 larp_show(
 256         struct kobject  *kobject,
 257         char            *buf)
 258 {
 259         return snprintf(buf, PAGE_SIZE, "%d\n", xfs_globals.larp);
 260 }
 261 XFS_SYSFS_ATTR_RW(larp);
 262
 263 STATIC ssize_t
 264 bload_leaf_slack_store(
 265         struct kobject  *kobject,
 266         const char      *buf,
 267         size_t          count)
 268 {
 269         int             ret;
 270         int             val;
 271
 272         ret = kstrtoint(buf, 0, &val);
 273         if (ret)
 274                 return ret;
 275
 276         xfs_globals.bload_leaf_slack = val;
 277         return count;
 278 }
 279
 280 STATIC ssize_t
 281 bload_leaf_slack_show(
 282         struct kobject  *kobject,
 283         char            *buf)
 284 {
 285         return snprintf(buf, PAGE_SIZE, "%d\n", xfs_globals.bload_leaf_slack);
 286 }
 287 XFS_SYSFS_ATTR_RW(bload_leaf_slack);
 288
 289 STATIC ssize_t
 290 bload_node_slack_store(
 291         struct kobject  *kobject,
 292         const char      *buf,
 293         size_t          count)
 294 {
 295         int             ret;
 296         int             val;
 297
 298         ret = kstrtoint(buf, 0, &val);
 299         if (ret)
 300                 return ret;
 301
 302         xfs_globals.bload_node_slack = val;
 303         return count;
 304 }
 305
 306 STATIC ssize_t
 307 bload_node_slack_show(
 308         struct kobject  *kobject,
 309         char            *buf)
 310 {
 311         return snprintf(buf, PAGE_SIZE, "%d\n", xfs_globals.bload_node_slack);
 312 }
 313 XFS_SYSFS_ATTR_RW(bload_node_slack);
 314
 315 static struct attribute *xfs_dbg_attrs[] = {
 316         ATTR_LIST(bug_on_assert),
 317         ATTR_LIST(log_recovery_delay),
 318         ATTR_LIST(mount_delay),
 319         ATTR_LIST(always_cow),
 320         ATTR_LIST(pwork_threads),
 321         ATTR_LIST(larp),
 322         ATTR_LIST(bload_leaf_slack),
 323         ATTR_LIST(bload_node_slack),
 324         NULL,
 325 };
 326 ATTRIBUTE_GROUPS(xfs_dbg);
 327
 328 const struct kobj_type xfs_dbg_ktype = {
 329         .release = xfs_sysfs_release,
 330         .sysfs_ops = &xfs_sysfs_ops,
 331         .default_groups = xfs_dbg_groups,
 332 };
 333
 334 #endif /* DEBUG */
 335
 336 /* stats */
 337
 338 static inline struct xstats *
 339 to_xstats(struct kobject *kobject)
 340 {
 341         struct xfs_kobj *kobj = to_kobj(kobject);
 342
 343         return container_of(kobj, struct xstats, xs_kobj);
 344 }
 345
 346 STATIC ssize_t
 347 stats_show(
 348         struct kobject  *kobject,
 349         char            *buf)
 350 {
 351         struct xstats   *stats = to_xstats(kobject);
 352
 353         return xfs_stats_format(stats->xs_stats, buf);
 354 }
 355 XFS_SYSFS_ATTR_RO(stats);
 356
 357 STATIC ssize_t
 358 stats_clear_store(
 359         struct kobject  *kobject,
 360         const char      *buf,
 361         size_t          count)
 362 {
 363         int             ret;
 364         int             val;
 365         struct xstats   *stats = to_xstats(kobject);
 366
 367         ret = kstrtoint(buf, 0, &val);
 368         if (ret)
 369                 return ret;
 370
 371         if (val != 1)
 372                 return -EINVAL;
 373
 374         xfs_stats_clearall(stats->xs_stats);
 375         return count;
 376 }
 377 XFS_SYSFS_ATTR_WO(stats_clear);
 378
 379 static struct attribute *xfs_stats_attrs[] = {
 380         ATTR_LIST(stats),
 381         ATTR_LIST(stats_clear),
 382         NULL,
 383 };
 384 ATTRIBUTE_GROUPS(xfs_stats);
 385
 386 const struct kobj_type xfs_stats_ktype = {
 387         .release = xfs_sysfs_release,
 388         .sysfs_ops = &xfs_sysfs_ops,
 389         .default_groups = xfs_stats_groups,
 390 };
 391
 392 /* xlog */
 393
 394 static inline struct xlog *
 395 to_xlog(struct kobject *kobject)
 396 {
 397         struct xfs_kobj *kobj = to_kobj(kobject);
 398
 399         return container_of(kobj, struct xlog, l_kobj);
 400 }
 401
 402 STATIC ssize_t
 403 log_head_lsn_show(
 404         struct kobject  *kobject,
 405         char            *buf)
 406 {
 407         int cycle;
 408         int block;
 409         struct xlog *log = to_xlog(kobject);
 410
 411         spin_lock(&log->l_icloglock);
 412         cycle = log->l_curr_cycle;
 413         block = log->l_curr_block;
 414         spin_unlock(&log->l_icloglock);
 415
 416         return sysfs_emit(buf, "%d:%d\n", cycle, block);
 417 }
 418 XFS_SYSFS_ATTR_RO(log_head_lsn);
 419
 420 STATIC ssize_t
 421 log_tail_lsn_show(
 422         struct kobject  *kobject,
 423         char            *buf)
 424 {
 425         int cycle;
 426         int block;
 427         struct xlog *log = to_xlog(kobject);
 428
 429         xlog_crack_atomic_lsn(&log->l_tail_lsn, &cycle, &block);
 430         return sysfs_emit(buf, "%d:%d\n", cycle, block);
 431 }
 432 XFS_SYSFS_ATTR_RO(log_tail_lsn);
 433
 434 STATIC ssize_t
 435 reserve_grant_head_bytes_show(
 436         struct kobject  *kobject,
 437         char            *buf)
 438 {
 439         return sysfs_emit(buf, "%lld\n",
 440                         atomic64_read(&to_xlog(kobject)->l_reserve_head.grant));
 441 }
 442 XFS_SYSFS_ATTR_RO(reserve_grant_head_bytes);
 443
 444 STATIC ssize_t
 445 write_grant_head_bytes_show(
 446         struct kobject  *kobject,
 447         char            *buf)
 448 {
 449         return sysfs_emit(buf, "%lld\n",
 450                         atomic64_read(&to_xlog(kobject)->l_write_head.grant));
 451 }
 452 XFS_SYSFS_ATTR_RO(write_grant_head_bytes);
 453
 454 static struct attribute *xfs_log_attrs[] = {
 455         ATTR_LIST(log_head_lsn),
 456         ATTR_LIST(log_tail_lsn),
 457         ATTR_LIST(reserve_grant_head_bytes),
 458         ATTR_LIST(write_grant_head_bytes),
 459         NULL,
 460 };
 461 ATTRIBUTE_GROUPS(xfs_log);
 462
 463 const struct kobj_type xfs_log_ktype = {
 464         .release = xfs_sysfs_release,
 465         .sysfs_ops = &xfs_sysfs_ops,
 466         .default_groups = xfs_log_groups,
 467 };
 468
 469 /*
 470  * Metadata IO error configuration
 471  *
 472  * The sysfs structure here is:
 473  *      ...xfs/<dev>/error/<class>/<errno>/<error_attrs>
 474  *
 475  * where <class> allows us to discriminate between data IO and metadata IO,
 476  * and any other future type of IO (e.g. special inode or directory error
 477  * handling) we care to support.
 478  */
 479 static inline struct xfs_error_cfg *
 480 to_error_cfg(struct kobject *kobject)
 481 {
 482         struct xfs_kobj *kobj = to_kobj(kobject);
 483         return container_of(kobj, struct xfs_error_cfg, kobj);
 484 }
 485
 486 static inline struct xfs_mount *
 487 err_to_mp(struct kobject *kobject)
 488 {
 489         struct xfs_kobj *kobj = to_kobj(kobject);
 490         return container_of(kobj, struct xfs_mount, m_error_kobj);
 491 }
 492
 493 static ssize_t
 494 max_retries_show(
 495         struct kobject  *kobject,
 496         char            *buf)
 497 {
 498         int             retries;
 499         struct xfs_error_cfg *cfg = to_error_cfg(kobject);
 500
 501         if (cfg->max_retries == XFS_ERR_RETRY_FOREVER)
 502                 retries = -1;
 503         else
 504                 retries = cfg->max_retries;
 505
 506         return sysfs_emit(buf, "%d\n", retries);
 507 }
 508
 509 static ssize_t
 510 max_retries_store(
 511         struct kobject  *kobject,
 512         const char      *buf,
 513         size_t          count)
 514 {
 515         struct xfs_error_cfg *cfg = to_error_cfg(kobject);
 516         int             ret;
 517         int             val;
 518
 519         ret = kstrtoint(buf, 0, &val);
 520         if (ret)
 521                 return ret;
 522
 523         if (val < -1)
 524                 return -EINVAL;
 525
 526         if (val == -1)
 527                 cfg->max_retries = XFS_ERR_RETRY_FOREVER;
 528         else
 529                 cfg->max_retries = val;
 530         return count;
 531 }
 532 XFS_SYSFS_ATTR_RW(max_retries);
 533
 534 static ssize_t
 535 retry_timeout_seconds_show(
 536         struct kobject  *kobject,
 537         char            *buf)
 538 {
 539         int             timeout;
 540         struct xfs_error_cfg *cfg = to_error_cfg(kobject);
 541
 542         if (cfg->retry_timeout == XFS_ERR_RETRY_FOREVER)
 543                 timeout = -1;
 544         else
 545                 timeout = jiffies_to_msecs(cfg->retry_timeout) / MSEC_PER_SEC;
 546
 547         return sysfs_emit(buf, "%d\n", timeout);
 548 }
 549
 550 static ssize_t
 551 retry_timeout_seconds_store(
 552         struct kobject  *kobject,
 553         const char      *buf,
 554         size_t          count)
 555 {
 556         struct xfs_error_cfg *cfg = to_error_cfg(kobject);
 557         int             ret;
 558         int             val;
 559
 560         ret = kstrtoint(buf, 0, &val);
 561         if (ret)
 562                 return ret;
 563
 564         /* 1 day timeout maximum, -1 means infinite */
 565         if (val < -1 || val > 86400)
 566                 return -EINVAL;
 567
 568         if (val == -1)
 569                 cfg->retry_timeout = XFS_ERR_RETRY_FOREVER;
 570         else {
 571                 cfg->retry_timeout = msecs_to_jiffies(val * MSEC_PER_SEC);
 572                 ASSERT(msecs_to_jiffies(val * MSEC_PER_SEC) < LONG_MAX);
 573         }
 574         return count;
 575 }
 576 XFS_SYSFS_ATTR_RW(retry_timeout_seconds);
 577
 578 static ssize_t
 579 fail_at_unmount_show(
 580         struct kobject  *kobject,
 581         char            *buf)
 582 {
 583         struct xfs_mount        *mp = err_to_mp(kobject);
 584
 585         return sysfs_emit(buf, "%d\n", mp->m_fail_unmount);
 586 }
 587
 588 static ssize_t
 589 fail_at_unmount_store(
 590         struct kobject  *kobject,
 591         const char      *buf,
 592         size_t          count)
 593 {
 594         struct xfs_mount        *mp = err_to_mp(kobject);
 595         int             ret;
 596         int             val;
 597
 598         ret = kstrtoint(buf, 0, &val);
 599         if (ret)
 600                 return ret;
 601
 602         if (val < 0 || val > 1)
 603                 return -EINVAL;
 604
 605         mp->m_fail_unmount = val;
 606         return count;
 607 }
 608 XFS_SYSFS_ATTR_RW(fail_at_unmount);
 609
 610 static struct attribute *xfs_error_attrs[] = {
 611         ATTR_LIST(max_retries),
 612         ATTR_LIST(retry_timeout_seconds),
 613         NULL,
 614 };
 615 ATTRIBUTE_GROUPS(xfs_error);
 616
 617 static const struct kobj_type xfs_error_cfg_ktype = {
 618         .release = xfs_sysfs_release,
 619         .sysfs_ops = &xfs_sysfs_ops,
 620         .default_groups = xfs_error_groups,
 621 };
 622
 623 static const struct kobj_type xfs_error_ktype = {
 624         .release = xfs_sysfs_release,
 625         .sysfs_ops = &xfs_sysfs_ops,
 626 };
 627
 628 /*
 629  * Error initialization tables. These need to be ordered in the same
 630  * order as the enums used to index the array. All class init tables need to
 631  * define a "default" behaviour as the first entry, all other entries can be
 632  * empty.
 633  */
 634 struct xfs_error_init {
 635         char            *name;
 636         int             max_retries;
 637         int             retry_timeout;  /* in seconds */
 638 };
 639
 640 static const struct xfs_error_init xfs_error_meta_init[XFS_ERR_ERRNO_MAX] = {
 641         { .name = "default",
 642           .max_retries = XFS_ERR_RETRY_FOREVER,
 643           .retry_timeout = XFS_ERR_RETRY_FOREVER,
 644         },
 645         { .name = "EIO",
 646           .max_retries = XFS_ERR_RETRY_FOREVER,
 647           .retry_timeout = XFS_ERR_RETRY_FOREVER,
 648         },
 649         { .name = "ENOSPC",
 650           .max_retries = XFS_ERR_RETRY_FOREVER,
 651           .retry_timeout = XFS_ERR_RETRY_FOREVER,
 652         },
 653         { .name = "ENODEV",
 654           .max_retries = 0,     /* We can't recover from devices disappearing */
 655           .retry_timeout = 0,
 656         },
 657 };
 658
 659 static int
 660 xfs_error_sysfs_init_class(
 661         struct xfs_mount        *mp,
 662         int                     class,
 663         const char              *parent_name,
 664         struct xfs_kobj         *parent_kobj,
 665         const struct xfs_error_init init[])
 666 {
 667         struct xfs_error_cfg    *cfg;
 668         int                     error;
 669         int                     i;
 670
 671         ASSERT(class < XFS_ERR_CLASS_MAX);
 672
 673         error = xfs_sysfs_init(parent_kobj, &xfs_error_ktype,
 674                                 &mp->m_error_kobj, parent_name);
 675         if (error)
 676                 return error;
 677
 678         for (i = 0; i < XFS_ERR_ERRNO_MAX; i++) {
 679                 cfg = &mp->m_error_cfg[class][i];
 680                 error = xfs_sysfs_init(&cfg->kobj, &xfs_error_cfg_ktype,
 681                                         parent_kobj, init[i].name);
 682                 if (error)
 683                         goto out_error;
 684
 685                 cfg->max_retries = init[i].max_retries;
 686                 if (init[i].retry_timeout == XFS_ERR_RETRY_FOREVER)
 687                         cfg->retry_timeout = XFS_ERR_RETRY_FOREVER;
 688                 else
 689                         cfg->retry_timeout = msecs_to_jiffies(
 690                                         init[i].retry_timeout * MSEC_PER_SEC);
 691         }
 692         return 0;
 693
 694 out_error:
 695         /* unwind the entries that succeeded */
 696         for (i--; i >= 0; i--) {
 697                 cfg = &mp->m_error_cfg[class][i];
 698                 xfs_sysfs_del(&cfg->kobj);
 699         }
 700         xfs_sysfs_del(parent_kobj);
 701         return error;
 702 }
 703
 704 int
 705 xfs_error_sysfs_init(
 706         struct xfs_mount        *mp)
 707 {
 708         int                     error;
 709
 710         /* .../xfs/<dev>/error/ */
 711         error = xfs_sysfs_init(&mp->m_error_kobj, &xfs_error_ktype,
 712                                 &mp->m_kobj, "error");
 713         if (error)
 714                 return error;
 715
 716         error = sysfs_create_file(&mp->m_error_kobj.kobject,
 717                                   ATTR_LIST(fail_at_unmount));
 718
 719         if (error)
 720                 goto out_error;
 721
 722         /* .../xfs/<dev>/error/metadata/ */
 723         error = xfs_error_sysfs_init_class(mp, XFS_ERR_METADATA,
 724                                 "metadata", &mp->m_error_meta_kobj,
 725                                 xfs_error_meta_init);
 726         if (error)
 727                 goto out_error;
 728
 729         return 0;
 730
 731 out_error:
 732         xfs_sysfs_del(&mp->m_error_kobj);
 733         return error;
 734 }
 735
 736 void
 737 xfs_error_sysfs_del(
 738         struct xfs_mount        *mp)
 739 {
 740         struct xfs_error_cfg    *cfg;
 741         int                     i, j;
 742
 743         for (i = 0; i < XFS_ERR_CLASS_MAX; i++) {
 744                 for (j = 0; j < XFS_ERR_ERRNO_MAX; j++) {
 745                         cfg = &mp->m_error_cfg[i][j];
 746
 747                         xfs_sysfs_del(&cfg->kobj);
 748                 }
 749         }
 750         xfs_sysfs_del(&mp->m_error_meta_kobj);
 751         xfs_sysfs_del(&mp->m_error_kobj);
 752 }
 753
 754 struct xfs_error_cfg *
 755 xfs_error_get_cfg(
 756         struct xfs_mount        *mp,
 757         int                     error_class,
 758         int                     error)
 759 {
 760         struct xfs_error_cfg    *cfg;
 761
 762         if (error < 0)
 763                 error = -error;
 764
 765         switch (error) {
 766         case EIO:
 767                 cfg = &mp->m_error_cfg[error_class][XFS_ERR_EIO];
 768                 break;
 769         case ENOSPC:
 770                 cfg = &mp->m_error_cfg[error_class][XFS_ERR_ENOSPC];
 771                 break;
 772         case ENODEV:
 773                 cfg = &mp->m_error_cfg[error_class][XFS_ERR_ENODEV];
 774                 break;
 775         default:
 776                 cfg = &mp->m_error_cfg[error_class][XFS_ERR_DEFAULT];
 777                 break;
 778         }
 779
 780         return cfg;
 781 }