fs/xfs/xfs_sysfs.c

   1 /*
   2  * Copyright (c) 2014 Red Hat, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18
  19 #include "xfs.h"
  20 #include "xfs_shared.h"
  21 #include "xfs_format.h"
  22 #include "xfs_log_format.h"
  23 #include "xfs_trans_resv.h"
  24 #include "xfs_sysfs.h"
  25 #include "xfs_log.h"
  26 #include "xfs_log_priv.h"
  27 #include "xfs_stats.h"
  28 #include "xfs_mount.h"
  29
  30 struct xfs_sysfs_attr {
  31         struct attribute attr;
  32         ssize_t (*show)(struct kobject *kobject, char *buf);
  33         ssize_t (*store)(struct kobject *kobject, const char *buf,
  34                          size_t count);
  35 };
  36
  37 static inline struct xfs_sysfs_attr *
  38 to_attr(struct attribute *attr)
  39 {
  40         return container_of(attr, struct xfs_sysfs_attr, attr);
  41 }
  42
  43 #define XFS_SYSFS_ATTR_RW(name) \
  44         static struct xfs_sysfs_attr xfs_sysfs_attr_##name = __ATTR_RW(name)
  45 #define XFS_SYSFS_ATTR_RO(name) \
  46         static struct xfs_sysfs_attr xfs_sysfs_attr_##name = __ATTR_RO(name)
  47 #define XFS_SYSFS_ATTR_WO(name) \
  48         static struct xfs_sysfs_attr xfs_sysfs_attr_##name = __ATTR_WO(name)
  49
  50 #define ATTR_LIST(name) &xfs_sysfs_attr_##name.attr
  51
  52 STATIC ssize_t
  53 xfs_sysfs_object_show(
  54         struct kobject          *kobject,
  55         struct attribute        *attr,
  56         char                    *buf)
  57 {
  58         struct xfs_sysfs_attr *xfs_attr = to_attr(attr);
  59
  60         return xfs_attr->show ? xfs_attr->show(kobject, buf) : 0;
  61 }
  62
  63 STATIC ssize_t
  64 xfs_sysfs_object_store(
  65         struct kobject          *kobject,
  66         struct attribute        *attr,
  67         const char              *buf,
  68         size_t                  count)
  69 {
  70         struct xfs_sysfs_attr *xfs_attr = to_attr(attr);
  71
  72         return xfs_attr->store ? xfs_attr->store(kobject, buf, count) : 0;
  73 }
  74
  75 static const struct sysfs_ops xfs_sysfs_ops = {
  76         .show = xfs_sysfs_object_show,
  77         .store = xfs_sysfs_object_store,
  78 };
  79
  80 /*
  81  * xfs_mount kobject. The mp kobject also serves as the per-mount parent object
  82  * that is identified by the fsname under sysfs.
  83  */
  84
  85 static inline struct xfs_mount *
  86 to_mp(struct kobject *kobject)
  87 {
  88         struct xfs_kobj *kobj = to_kobj(kobject);
  89
  90         return container_of(kobj, struct xfs_mount, m_kobj);
  91 }
  92
  93 #ifdef DEBUG
  94
  95 STATIC ssize_t
  96 fail_writes_store(
  97         struct kobject          *kobject,
  98         const char              *buf,
  99         size_t                  count)
 100 {
 101         struct xfs_mount        *mp = to_mp(kobject);
 102         int                     ret;
 103         int                     val;
 104
 105         ret = kstrtoint(buf, 0, &val);
 106         if (ret)
 107                 return ret;
 108
 109         if (val == 1)
 110                 mp->m_fail_writes = true;
 111         else if (val == 0)
 112                 mp->m_fail_writes = false;
 113         else
 114                 return -EINVAL;
 115
 116         return count;
 117 }
 118
 119 STATIC ssize_t
 120 fail_writes_show(
 121         struct kobject          *kobject,
 122         char                    *buf)
 123 {
 124         struct xfs_mount        *mp = to_mp(kobject);
 125
 126         return snprintf(buf, PAGE_SIZE, "%d\n", mp->m_fail_writes ? 1 : 0);
 127 }
 128 XFS_SYSFS_ATTR_RW(fail_writes);
 129
 130 #endif /* DEBUG */
 131
 132 static struct attribute *xfs_mp_attrs[] = {
 133 #ifdef DEBUG
 134         ATTR_LIST(fail_writes),
 135 #endif
 136         NULL,
 137 };
 138
 139 struct kobj_type xfs_mp_ktype = {
 140         .release = xfs_sysfs_release,
 141         .sysfs_ops = &xfs_sysfs_ops,
 142         .default_attrs = xfs_mp_attrs,
 143 };
 144
 145 #ifdef DEBUG
 146 /* debug */
 147
 148 STATIC ssize_t
 149 log_recovery_delay_store(
 150         struct kobject  *kobject,
 151         const char      *buf,
 152         size_t          count)
 153 {
 154         int             ret;
 155         int             val;
 156
 157         ret = kstrtoint(buf, 0, &val);
 158         if (ret)
 159                 return ret;
 160
 161         if (val < 0 || val > 60)
 162                 return -EINVAL;
 163
 164         xfs_globals.log_recovery_delay = val;
 165
 166         return count;
 167 }
 168
 169 STATIC ssize_t
 170 log_recovery_delay_show(
 171         struct kobject  *kobject,
 172         char            *buf)
 173 {
 174         return snprintf(buf, PAGE_SIZE, "%d\n", xfs_globals.log_recovery_delay);
 175 }
 176 XFS_SYSFS_ATTR_RW(log_recovery_delay);
 177
 178 static struct attribute *xfs_dbg_attrs[] = {
 179         ATTR_LIST(log_recovery_delay),
 180         NULL,
 181 };
 182
 183 struct kobj_type xfs_dbg_ktype = {
 184         .release = xfs_sysfs_release,
 185         .sysfs_ops = &xfs_sysfs_ops,
 186         .default_attrs = xfs_dbg_attrs,
 187 };
 188
 189 #endif /* DEBUG */
 190
 191 /* stats */
 192
 193 static inline struct xstats *
 194 to_xstats(struct kobject *kobject)
 195 {
 196         struct xfs_kobj *kobj = to_kobj(kobject);
 197
 198         return container_of(kobj, struct xstats, xs_kobj);
 199 }
 200
 201 STATIC ssize_t
 202 stats_show(
 203         struct kobject  *kobject,
 204         char            *buf)
 205 {
 206         struct xstats   *stats = to_xstats(kobject);
 207
 208         return xfs_stats_format(stats->xs_stats, buf);
 209 }
 210 XFS_SYSFS_ATTR_RO(stats);
 211
 212 STATIC ssize_t
 213 stats_clear_store(
 214         struct kobject  *kobject,
 215         const char      *buf,
 216         size_t          count)
 217 {
 218         int             ret;
 219         int             val;
 220         struct xstats   *stats = to_xstats(kobject);
 221
 222         ret = kstrtoint(buf, 0, &val);
 223         if (ret)
 224                 return ret;
 225
 226         if (val != 1)
 227                 return -EINVAL;
 228
 229         xfs_stats_clearall(stats->xs_stats);
 230         return count;
 231 }
 232 XFS_SYSFS_ATTR_WO(stats_clear);
 233
 234 static struct attribute *xfs_stats_attrs[] = {
 235         ATTR_LIST(stats),
 236         ATTR_LIST(stats_clear),
 237         NULL,
 238 };
 239
 240 struct kobj_type xfs_stats_ktype = {
 241         .release = xfs_sysfs_release,
 242         .sysfs_ops = &xfs_sysfs_ops,
 243         .default_attrs = xfs_stats_attrs,
 244 };
 245
 246 /* xlog */
 247
 248 static inline struct xlog *
 249 to_xlog(struct kobject *kobject)
 250 {
 251         struct xfs_kobj *kobj = to_kobj(kobject);
 252
 253         return container_of(kobj, struct xlog, l_kobj);
 254 }
 255
 256 STATIC ssize_t
 257 log_head_lsn_show(
 258         struct kobject  *kobject,
 259         char            *buf)
 260 {
 261         int cycle;
 262         int block;
 263         struct xlog *log = to_xlog(kobject);
 264
 265         spin_lock(&log->l_icloglock);
 266         cycle = log->l_curr_cycle;
 267         block = log->l_curr_block;
 268         spin_unlock(&log->l_icloglock);
 269
 270         return snprintf(buf, PAGE_SIZE, "%d:%d\n", cycle, block);
 271 }
 272 XFS_SYSFS_ATTR_RO(log_head_lsn);
 273
 274 STATIC ssize_t
 275 log_tail_lsn_show(
 276         struct kobject  *kobject,
 277         char            *buf)
 278 {
 279         int cycle;
 280         int block;
 281         struct xlog *log = to_xlog(kobject);
 282
 283         xlog_crack_atomic_lsn(&log->l_tail_lsn, &cycle, &block);
 284         return snprintf(buf, PAGE_SIZE, "%d:%d\n", cycle, block);
 285 }
 286 XFS_SYSFS_ATTR_RO(log_tail_lsn);
 287
 288 STATIC ssize_t
 289 reserve_grant_head_show(
 290         struct kobject  *kobject,
 291         char            *buf)
 292
 293 {
 294         int cycle;
 295         int bytes;
 296         struct xlog *log = to_xlog(kobject);
 297
 298         xlog_crack_grant_head(&log->l_reserve_head.grant, &cycle, &bytes);
 299         return snprintf(buf, PAGE_SIZE, "%d:%d\n", cycle, bytes);
 300 }
 301 XFS_SYSFS_ATTR_RO(reserve_grant_head);
 302
 303 STATIC ssize_t
 304 write_grant_head_show(
 305         struct kobject  *kobject,
 306         char            *buf)
 307 {
 308         int cycle;
 309         int bytes;
 310         struct xlog *log = to_xlog(kobject);
 311
 312         xlog_crack_grant_head(&log->l_write_head.grant, &cycle, &bytes);
 313         return snprintf(buf, PAGE_SIZE, "%d:%d\n", cycle, bytes);
 314 }
 315 XFS_SYSFS_ATTR_RO(write_grant_head);
 316
 317 #ifdef DEBUG
 318 STATIC ssize_t
 319 log_badcrc_factor_store(
 320         struct kobject  *kobject,
 321         const char      *buf,
 322         size_t          count)
 323 {
 324         struct xlog     *log = to_xlog(kobject);
 325         int             ret;
 326         uint32_t        val;
 327
 328         ret = kstrtouint(buf, 0, &val);
 329         if (ret)
 330                 return ret;
 331
 332         log->l_badcrc_factor = val;
 333
 334         return count;
 335 }
 336
 337 STATIC ssize_t
 338 log_badcrc_factor_show(
 339         struct kobject  *kobject,
 340         char            *buf)
 341 {
 342         struct xlog     *log = to_xlog(kobject);
 343
 344         return snprintf(buf, PAGE_SIZE, "%d\n", log->l_badcrc_factor);
 345 }
 346
 347 XFS_SYSFS_ATTR_RW(log_badcrc_factor);
 348 #endif  /* DEBUG */
 349
 350 static struct attribute *xfs_log_attrs[] = {
 351         ATTR_LIST(log_head_lsn),
 352         ATTR_LIST(log_tail_lsn),
 353         ATTR_LIST(reserve_grant_head),
 354         ATTR_LIST(write_grant_head),
 355 #ifdef DEBUG
 356         ATTR_LIST(log_badcrc_factor),
 357 #endif
 358         NULL,
 359 };
 360
 361 struct kobj_type xfs_log_ktype = {
 362         .release = xfs_sysfs_release,
 363         .sysfs_ops = &xfs_sysfs_ops,
 364         .default_attrs = xfs_log_attrs,
 365 };
 366
 367 /*
 368  * Metadata IO error configuration
 369  *
 370  * The sysfs structure here is:
 371  *      ...xfs/<dev>/error/<class>/<errno>/<error_attrs>
 372  *
 373  * where <class> allows us to discriminate between data IO and metadata IO,
 374  * and any other future type of IO (e.g. special inode or directory error
 375  * handling) we care to support.
 376  */
 377 static inline struct xfs_error_cfg *
 378 to_error_cfg(struct kobject *kobject)
 379 {
 380         struct xfs_kobj *kobj = to_kobj(kobject);
 381         return container_of(kobj, struct xfs_error_cfg, kobj);
 382 }
 383
 384 static inline struct xfs_mount *
 385 err_to_mp(struct kobject *kobject)
 386 {
 387         struct xfs_kobj *kobj = to_kobj(kobject);
 388         return container_of(kobj, struct xfs_mount, m_error_kobj);
 389 }
 390
 391 static ssize_t
 392 max_retries_show(
 393         struct kobject  *kobject,
 394         char            *buf)
 395 {
 396         struct xfs_error_cfg *cfg = to_error_cfg(kobject);
 397
 398         return snprintf(buf, PAGE_SIZE, "%d\n", cfg->max_retries);
 399 }
 400
 401 static ssize_t
 402 max_retries_store(
 403         struct kobject  *kobject,
 404         const char      *buf,
 405         size_t          count)
 406 {
 407         struct xfs_error_cfg *cfg = to_error_cfg(kobject);
 408         int             ret;
 409         int             val;
 410
 411         ret = kstrtoint(buf, 0, &val);
 412         if (ret)
 413                 return ret;
 414
 415         if (val < -1)
 416                 return -EINVAL;
 417
 418         cfg->max_retries = val;
 419         return count;
 420 }
 421 XFS_SYSFS_ATTR_RW(max_retries);
 422
 423 static ssize_t
 424 retry_timeout_seconds_show(
 425         struct kobject  *kobject,
 426         char            *buf)
 427 {
 428         struct xfs_error_cfg *cfg = to_error_cfg(kobject);
 429
 430         return snprintf(buf, PAGE_SIZE, "%ld\n",
 431                         jiffies_to_msecs(cfg->retry_timeout) / MSEC_PER_SEC);
 432 }
 433
 434 static ssize_t
 435 retry_timeout_seconds_store(
 436         struct kobject  *kobject,
 437         const char      *buf,
 438         size_t          count)
 439 {
 440         struct xfs_error_cfg *cfg = to_error_cfg(kobject);
 441         int             ret;
 442         int             val;
 443
 444         ret = kstrtoint(buf, 0, &val);
 445         if (ret)
 446                 return ret;
 447
 448         /* 1 day timeout maximum */
 449         if (val < 0 || val > 86400)
 450                 return -EINVAL;
 451
 452         cfg->retry_timeout = msecs_to_jiffies(val * MSEC_PER_SEC);
 453         return count;
 454 }
 455 XFS_SYSFS_ATTR_RW(retry_timeout_seconds);
 456
 457 static ssize_t
 458 fail_at_unmount_show(
 459         struct kobject  *kobject,
 460         char            *buf)
 461 {
 462         struct xfs_mount        *mp = err_to_mp(kobject);
 463
 464         return snprintf(buf, PAGE_SIZE, "%d\n", mp->m_fail_unmount);
 465 }
 466
 467 static ssize_t
 468 fail_at_unmount_store(
 469         struct kobject  *kobject,
 470         const char      *buf,
 471         size_t          count)
 472 {
 473         struct xfs_mount        *mp = err_to_mp(kobject);
 474         int             ret;
 475         int             val;
 476
 477         ret = kstrtoint(buf, 0, &val);
 478         if (ret)
 479                 return ret;
 480
 481         if (val < 0 || val > 1)
 482                 return -EINVAL;
 483
 484         mp->m_fail_unmount = val;
 485         return count;
 486 }
 487 XFS_SYSFS_ATTR_RW(fail_at_unmount);
 488
 489 static struct attribute *xfs_error_attrs[] = {
 490         ATTR_LIST(max_retries),
 491         ATTR_LIST(retry_timeout_seconds),
 492         NULL,
 493 };
 494
 495
 496 struct kobj_type xfs_error_cfg_ktype = {
 497         .release = xfs_sysfs_release,
 498         .sysfs_ops = &xfs_sysfs_ops,
 499         .default_attrs = xfs_error_attrs,
 500 };
 501
 502 struct kobj_type xfs_error_ktype = {
 503         .release = xfs_sysfs_release,
 504         .sysfs_ops = &xfs_sysfs_ops,
 505 };
 506
 507 /*
 508  * Error initialization tables. These need to be ordered in the same
 509  * order as the enums used to index the array. All class init tables need to
 510  * define a "default" behaviour as the first entry, all other entries can be
 511  * empty.
 512  */
 513 struct xfs_error_init {
 514         char            *name;
 515         int             max_retries;
 516         int             retry_timeout;  /* in seconds */
 517 };
 518
 519 static const struct xfs_error_init xfs_error_meta_init[XFS_ERR_ERRNO_MAX] = {
 520         { .name = "default",
 521           .max_retries = XFS_ERR_RETRY_FOREVER,
 522           .retry_timeout = 0,
 523         },
 524         { .name = "EIO",
 525           .max_retries = XFS_ERR_RETRY_FOREVER,
 526           .retry_timeout = 0,
 527         },
 528         { .name = "ENOSPC",
 529           .max_retries = XFS_ERR_RETRY_FOREVER,
 530           .retry_timeout = 0,
 531         },
 532         { .name = "ENODEV",
 533           .max_retries = 0,
 534         },
 535 };
 536
 537 static int
 538 xfs_error_sysfs_init_class(
 539         struct xfs_mount        *mp,
 540         int                     class,
 541         const char              *parent_name,
 542         struct xfs_kobj         *parent_kobj,
 543         const struct xfs_error_init init[])
 544 {
 545         struct xfs_error_cfg    *cfg;
 546         int                     error;
 547         int                     i;
 548
 549         ASSERT(class < XFS_ERR_CLASS_MAX);
 550
 551         error = xfs_sysfs_init(parent_kobj, &xfs_error_ktype,
 552                                 &mp->m_error_kobj, parent_name);
 553         if (error)
 554                 return error;
 555
 556         for (i = 0; i < XFS_ERR_ERRNO_MAX; i++) {
 557                 cfg = &mp->m_error_cfg[class][i];
 558                 error = xfs_sysfs_init(&cfg->kobj, &xfs_error_cfg_ktype,
 559                                         parent_kobj, init[i].name);
 560                 if (error)
 561                         goto out_error;
 562
 563                 cfg->max_retries = init[i].max_retries;
 564                 cfg->retry_timeout = msecs_to_jiffies(
 565                                         init[i].retry_timeout * MSEC_PER_SEC);
 566         }
 567         return 0;
 568
 569 out_error:
 570         /* unwind the entries that succeeded */
 571         for (i--; i >= 0; i--) {
 572                 cfg = &mp->m_error_cfg[class][i];
 573                 xfs_sysfs_del(&cfg->kobj);
 574         }
 575         xfs_sysfs_del(parent_kobj);
 576         return error;
 577 }
 578
 579 int
 580 xfs_error_sysfs_init(
 581         struct xfs_mount        *mp)
 582 {
 583         int                     error;
 584
 585         /* .../xfs/<dev>/error/ */
 586         error = xfs_sysfs_init(&mp->m_error_kobj, &xfs_error_ktype,
 587                                 &mp->m_kobj, "error");
 588         if (error)
 589                 return error;
 590
 591         error = sysfs_create_file(&mp->m_error_kobj.kobject,
 592                                   ATTR_LIST(fail_at_unmount));
 593
 594         if (error)
 595                 goto out_error;
 596
 597         /* .../xfs/<dev>/error/metadata/ */
 598         error = xfs_error_sysfs_init_class(mp, XFS_ERR_METADATA,
 599                                 "metadata", &mp->m_error_meta_kobj,
 600                                 xfs_error_meta_init);
 601         if (error)
 602                 goto out_error;
 603
 604         return 0;
 605
 606 out_error:
 607         xfs_sysfs_del(&mp->m_error_kobj);
 608         return error;
 609 }
 610
 611 void
 612 xfs_error_sysfs_del(
 613         struct xfs_mount        *mp)
 614 {
 615         struct xfs_error_cfg    *cfg;
 616         int                     i, j;
 617
 618         for (i = 0; i < XFS_ERR_CLASS_MAX; i++) {
 619                 for (j = 0; j < XFS_ERR_ERRNO_MAX; j++) {
 620                         cfg = &mp->m_error_cfg[i][j];
 621
 622                         xfs_sysfs_del(&cfg->kobj);
 623                 }
 624         }
 625         xfs_sysfs_del(&mp->m_error_meta_kobj);
 626         xfs_sysfs_del(&mp->m_error_kobj);
 627 }
 628
 629 struct xfs_error_cfg *
 630 xfs_error_get_cfg(
 631         struct xfs_mount        *mp,
 632         int                     error_class,
 633         int                     error)
 634 {
 635         struct xfs_error_cfg    *cfg;
 636
 637         switch (error) {
 638         case EIO:
 639                 cfg = &mp->m_error_cfg[error_class][XFS_ERR_EIO];
 640                 break;
 641         case ENOSPC:
 642                 cfg = &mp->m_error_cfg[error_class][XFS_ERR_ENOSPC];
 643                 break;
 644         case ENODEV:
 645                 cfg = &mp->m_error_cfg[error_class][XFS_ERR_ENODEV];
 646                 break;
 647         default:
 648                 cfg = &mp->m_error_cfg[error_class][XFS_ERR_DEFAULT];
 649                 break;
 650         }
 651
 652         return cfg;
 653 }