xfs_sysfs.c 14 KB

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  1. // SPDX-License-Identifier: GPL-2.0
  2. /*
  3. * Copyright (c) 2014 Red Hat, Inc.
  4. * All Rights Reserved.
  5. */
  6. #include "xfs.h"
  7. #include "xfs_shared.h"
  8. #include "xfs_format.h"
  9. #include "xfs_log_format.h"
  10. #include "xfs_trans_resv.h"
  11. #include "xfs_sysfs.h"
  12. #include "xfs_log_priv.h"
  13. #include "xfs_mount.h"
  14. struct xfs_sysfs_attr {
  15. struct attribute attr;
  16. ssize_t (*show)(struct kobject *kobject, char *buf);
  17. ssize_t (*store)(struct kobject *kobject, const char *buf,
  18. size_t count);
  19. };
  20. static inline struct xfs_sysfs_attr *
  21. to_attr(struct attribute *attr)
  22. {
  23. return container_of(attr, struct xfs_sysfs_attr, attr);
  24. }
  25. #define XFS_SYSFS_ATTR_RW(name) \
  26. static struct xfs_sysfs_attr xfs_sysfs_attr_##name = __ATTR_RW(name)
  27. #define XFS_SYSFS_ATTR_RO(name) \
  28. static struct xfs_sysfs_attr xfs_sysfs_attr_##name = __ATTR_RO(name)
  29. #define XFS_SYSFS_ATTR_WO(name) \
  30. static struct xfs_sysfs_attr xfs_sysfs_attr_##name = __ATTR_WO(name)
  31. #define ATTR_LIST(name) &xfs_sysfs_attr_##name.attr
  32. STATIC ssize_t
  33. xfs_sysfs_object_show(
  34. struct kobject *kobject,
  35. struct attribute *attr,
  36. char *buf)
  37. {
  38. struct xfs_sysfs_attr *xfs_attr = to_attr(attr);
  39. return xfs_attr->show ? xfs_attr->show(kobject, buf) : 0;
  40. }
  41. STATIC ssize_t
  42. xfs_sysfs_object_store(
  43. struct kobject *kobject,
  44. struct attribute *attr,
  45. const char *buf,
  46. size_t count)
  47. {
  48. struct xfs_sysfs_attr *xfs_attr = to_attr(attr);
  49. return xfs_attr->store ? xfs_attr->store(kobject, buf, count) : 0;
  50. }
  51. static const struct sysfs_ops xfs_sysfs_ops = {
  52. .show = xfs_sysfs_object_show,
  53. .store = xfs_sysfs_object_store,
  54. };
  55. static struct attribute *xfs_mp_attrs[] = {
  56. NULL,
  57. };
  58. struct kobj_type xfs_mp_ktype = {
  59. .release = xfs_sysfs_release,
  60. .sysfs_ops = &xfs_sysfs_ops,
  61. .default_attrs = xfs_mp_attrs,
  62. };
  63. #ifdef DEBUG
  64. /* debug */
  65. STATIC ssize_t
  66. bug_on_assert_store(
  67. struct kobject *kobject,
  68. const char *buf,
  69. size_t count)
  70. {
  71. int ret;
  72. int val;
  73. ret = kstrtoint(buf, 0, &val);
  74. if (ret)
  75. return ret;
  76. if (val == 1)
  77. xfs_globals.bug_on_assert = true;
  78. else if (val == 0)
  79. xfs_globals.bug_on_assert = false;
  80. else
  81. return -EINVAL;
  82. return count;
  83. }
  84. STATIC ssize_t
  85. bug_on_assert_show(
  86. struct kobject *kobject,
  87. char *buf)
  88. {
  89. return snprintf(buf, PAGE_SIZE, "%d\n", xfs_globals.bug_on_assert ? 1 : 0);
  90. }
  91. XFS_SYSFS_ATTR_RW(bug_on_assert);
  92. STATIC ssize_t
  93. log_recovery_delay_store(
  94. struct kobject *kobject,
  95. const char *buf,
  96. size_t count)
  97. {
  98. int ret;
  99. int val;
  100. ret = kstrtoint(buf, 0, &val);
  101. if (ret)
  102. return ret;
  103. if (val < 0 || val > 60)
  104. return -EINVAL;
  105. xfs_globals.log_recovery_delay = val;
  106. return count;
  107. }
  108. STATIC ssize_t
  109. log_recovery_delay_show(
  110. struct kobject *kobject,
  111. char *buf)
  112. {
  113. return snprintf(buf, PAGE_SIZE, "%d\n", xfs_globals.log_recovery_delay);
  114. }
  115. XFS_SYSFS_ATTR_RW(log_recovery_delay);
  116. STATIC ssize_t
  117. mount_delay_store(
  118. struct kobject *kobject,
  119. const char *buf,
  120. size_t count)
  121. {
  122. int ret;
  123. int val;
  124. ret = kstrtoint(buf, 0, &val);
  125. if (ret)
  126. return ret;
  127. if (val < 0 || val > 60)
  128. return -EINVAL;
  129. xfs_globals.mount_delay = val;
  130. return count;
  131. }
  132. STATIC ssize_t
  133. mount_delay_show(
  134. struct kobject *kobject,
  135. char *buf)
  136. {
  137. return snprintf(buf, PAGE_SIZE, "%d\n", xfs_globals.mount_delay);
  138. }
  139. XFS_SYSFS_ATTR_RW(mount_delay);
  140. static ssize_t
  141. always_cow_store(
  142. struct kobject *kobject,
  143. const char *buf,
  144. size_t count)
  145. {
  146. ssize_t ret;
  147. ret = kstrtobool(buf, &xfs_globals.always_cow);
  148. if (ret < 0)
  149. return ret;
  150. return count;
  151. }
  152. static ssize_t
  153. always_cow_show(
  154. struct kobject *kobject,
  155. char *buf)
  156. {
  157. return snprintf(buf, PAGE_SIZE, "%d\n", xfs_globals.always_cow);
  158. }
  159. XFS_SYSFS_ATTR_RW(always_cow);
  160. #ifdef DEBUG
  161. /*
  162. * Override how many threads the parallel work queue is allowed to create.
  163. * This has to be a debug-only global (instead of an errortag) because one of
  164. * the main users of parallel workqueues is mount time quotacheck.
  165. */
  166. STATIC ssize_t
  167. pwork_threads_store(
  168. struct kobject *kobject,
  169. const char *buf,
  170. size_t count)
  171. {
  172. int ret;
  173. int val;
  174. ret = kstrtoint(buf, 0, &val);
  175. if (ret)
  176. return ret;
  177. if (val < -1 || val > num_possible_cpus())
  178. return -EINVAL;
  179. xfs_globals.pwork_threads = val;
  180. return count;
  181. }
  182. STATIC ssize_t
  183. pwork_threads_show(
  184. struct kobject *kobject,
  185. char *buf)
  186. {
  187. return snprintf(buf, PAGE_SIZE, "%d\n", xfs_globals.pwork_threads);
  188. }
  189. XFS_SYSFS_ATTR_RW(pwork_threads);
  190. #endif /* DEBUG */
  191. static struct attribute *xfs_dbg_attrs[] = {
  192. ATTR_LIST(bug_on_assert),
  193. ATTR_LIST(log_recovery_delay),
  194. ATTR_LIST(mount_delay),
  195. ATTR_LIST(always_cow),
  196. #ifdef DEBUG
  197. ATTR_LIST(pwork_threads),
  198. #endif
  199. NULL,
  200. };
  201. struct kobj_type xfs_dbg_ktype = {
  202. .release = xfs_sysfs_release,
  203. .sysfs_ops = &xfs_sysfs_ops,
  204. .default_attrs = xfs_dbg_attrs,
  205. };
  206. #endif /* DEBUG */
  207. /* stats */
  208. static inline struct xstats *
  209. to_xstats(struct kobject *kobject)
  210. {
  211. struct xfs_kobj *kobj = to_kobj(kobject);
  212. return container_of(kobj, struct xstats, xs_kobj);
  213. }
  214. STATIC ssize_t
  215. stats_show(
  216. struct kobject *kobject,
  217. char *buf)
  218. {
  219. struct xstats *stats = to_xstats(kobject);
  220. return xfs_stats_format(stats->xs_stats, buf);
  221. }
  222. XFS_SYSFS_ATTR_RO(stats);
  223. STATIC ssize_t
  224. stats_clear_store(
  225. struct kobject *kobject,
  226. const char *buf,
  227. size_t count)
  228. {
  229. int ret;
  230. int val;
  231. struct xstats *stats = to_xstats(kobject);
  232. ret = kstrtoint(buf, 0, &val);
  233. if (ret)
  234. return ret;
  235. if (val != 1)
  236. return -EINVAL;
  237. xfs_stats_clearall(stats->xs_stats);
  238. return count;
  239. }
  240. XFS_SYSFS_ATTR_WO(stats_clear);
  241. static struct attribute *xfs_stats_attrs[] = {
  242. ATTR_LIST(stats),
  243. ATTR_LIST(stats_clear),
  244. NULL,
  245. };
  246. struct kobj_type xfs_stats_ktype = {
  247. .release = xfs_sysfs_release,
  248. .sysfs_ops = &xfs_sysfs_ops,
  249. .default_attrs = xfs_stats_attrs,
  250. };
  251. /* xlog */
  252. static inline struct xlog *
  253. to_xlog(struct kobject *kobject)
  254. {
  255. struct xfs_kobj *kobj = to_kobj(kobject);
  256. return container_of(kobj, struct xlog, l_kobj);
  257. }
  258. STATIC ssize_t
  259. log_head_lsn_show(
  260. struct kobject *kobject,
  261. char *buf)
  262. {
  263. int cycle;
  264. int block;
  265. struct xlog *log = to_xlog(kobject);
  266. spin_lock(&log->l_icloglock);
  267. cycle = log->l_curr_cycle;
  268. block = log->l_curr_block;
  269. spin_unlock(&log->l_icloglock);
  270. return snprintf(buf, PAGE_SIZE, "%d:%d\n", cycle, block);
  271. }
  272. XFS_SYSFS_ATTR_RO(log_head_lsn);
  273. STATIC ssize_t
  274. log_tail_lsn_show(
  275. struct kobject *kobject,
  276. char *buf)
  277. {
  278. int cycle;
  279. int block;
  280. struct xlog *log = to_xlog(kobject);
  281. xlog_crack_atomic_lsn(&log->l_tail_lsn, &cycle, &block);
  282. return snprintf(buf, PAGE_SIZE, "%d:%d\n", cycle, block);
  283. }
  284. XFS_SYSFS_ATTR_RO(log_tail_lsn);
  285. STATIC ssize_t
  286. reserve_grant_head_show(
  287. struct kobject *kobject,
  288. char *buf)
  289. {
  290. int cycle;
  291. int bytes;
  292. struct xlog *log = to_xlog(kobject);
  293. xlog_crack_grant_head(&log->l_reserve_head.grant, &cycle, &bytes);
  294. return snprintf(buf, PAGE_SIZE, "%d:%d\n", cycle, bytes);
  295. }
  296. XFS_SYSFS_ATTR_RO(reserve_grant_head);
  297. STATIC ssize_t
  298. write_grant_head_show(
  299. struct kobject *kobject,
  300. char *buf)
  301. {
  302. int cycle;
  303. int bytes;
  304. struct xlog *log = to_xlog(kobject);
  305. xlog_crack_grant_head(&log->l_write_head.grant, &cycle, &bytes);
  306. return snprintf(buf, PAGE_SIZE, "%d:%d\n", cycle, bytes);
  307. }
  308. XFS_SYSFS_ATTR_RO(write_grant_head);
  309. static struct attribute *xfs_log_attrs[] = {
  310. ATTR_LIST(log_head_lsn),
  311. ATTR_LIST(log_tail_lsn),
  312. ATTR_LIST(reserve_grant_head),
  313. ATTR_LIST(write_grant_head),
  314. NULL,
  315. };
  316. struct kobj_type xfs_log_ktype = {
  317. .release = xfs_sysfs_release,
  318. .sysfs_ops = &xfs_sysfs_ops,
  319. .default_attrs = xfs_log_attrs,
  320. };
  321. /*
  322. * Metadata IO error configuration
  323. *
  324. * The sysfs structure here is:
  325. * ...xfs/<dev>/error/<class>/<errno>/<error_attrs>
  326. *
  327. * where <class> allows us to discriminate between data IO and metadata IO,
  328. * and any other future type of IO (e.g. special inode or directory error
  329. * handling) we care to support.
  330. */
  331. static inline struct xfs_error_cfg *
  332. to_error_cfg(struct kobject *kobject)
  333. {
  334. struct xfs_kobj *kobj = to_kobj(kobject);
  335. return container_of(kobj, struct xfs_error_cfg, kobj);
  336. }
  337. static inline struct xfs_mount *
  338. err_to_mp(struct kobject *kobject)
  339. {
  340. struct xfs_kobj *kobj = to_kobj(kobject);
  341. return container_of(kobj, struct xfs_mount, m_error_kobj);
  342. }
  343. static ssize_t
  344. max_retries_show(
  345. struct kobject *kobject,
  346. char *buf)
  347. {
  348. int retries;
  349. struct xfs_error_cfg *cfg = to_error_cfg(kobject);
  350. if (cfg->max_retries == XFS_ERR_RETRY_FOREVER)
  351. retries = -1;
  352. else
  353. retries = cfg->max_retries;
  354. return snprintf(buf, PAGE_SIZE, "%d\n", retries);
  355. }
  356. static ssize_t
  357. max_retries_store(
  358. struct kobject *kobject,
  359. const char *buf,
  360. size_t count)
  361. {
  362. struct xfs_error_cfg *cfg = to_error_cfg(kobject);
  363. int ret;
  364. int val;
  365. ret = kstrtoint(buf, 0, &val);
  366. if (ret)
  367. return ret;
  368. if (val < -1)
  369. return -EINVAL;
  370. if (val == -1)
  371. cfg->max_retries = XFS_ERR_RETRY_FOREVER;
  372. else
  373. cfg->max_retries = val;
  374. return count;
  375. }
  376. XFS_SYSFS_ATTR_RW(max_retries);
  377. static ssize_t
  378. retry_timeout_seconds_show(
  379. struct kobject *kobject,
  380. char *buf)
  381. {
  382. int timeout;
  383. struct xfs_error_cfg *cfg = to_error_cfg(kobject);
  384. if (cfg->retry_timeout == XFS_ERR_RETRY_FOREVER)
  385. timeout = -1;
  386. else
  387. timeout = jiffies_to_msecs(cfg->retry_timeout) / MSEC_PER_SEC;
  388. return snprintf(buf, PAGE_SIZE, "%d\n", timeout);
  389. }
  390. static ssize_t
  391. retry_timeout_seconds_store(
  392. struct kobject *kobject,
  393. const char *buf,
  394. size_t count)
  395. {
  396. struct xfs_error_cfg *cfg = to_error_cfg(kobject);
  397. int ret;
  398. int val;
  399. ret = kstrtoint(buf, 0, &val);
  400. if (ret)
  401. return ret;
  402. /* 1 day timeout maximum, -1 means infinite */
  403. if (val < -1 || val > 86400)
  404. return -EINVAL;
  405. if (val == -1)
  406. cfg->retry_timeout = XFS_ERR_RETRY_FOREVER;
  407. else {
  408. cfg->retry_timeout = msecs_to_jiffies(val * MSEC_PER_SEC);
  409. ASSERT(msecs_to_jiffies(val * MSEC_PER_SEC) < LONG_MAX);
  410. }
  411. return count;
  412. }
  413. XFS_SYSFS_ATTR_RW(retry_timeout_seconds);
  414. static ssize_t
  415. fail_at_unmount_show(
  416. struct kobject *kobject,
  417. char *buf)
  418. {
  419. struct xfs_mount *mp = err_to_mp(kobject);
  420. return snprintf(buf, PAGE_SIZE, "%d\n", mp->m_fail_unmount);
  421. }
  422. static ssize_t
  423. fail_at_unmount_store(
  424. struct kobject *kobject,
  425. const char *buf,
  426. size_t count)
  427. {
  428. struct xfs_mount *mp = err_to_mp(kobject);
  429. int ret;
  430. int val;
  431. ret = kstrtoint(buf, 0, &val);
  432. if (ret)
  433. return ret;
  434. if (val < 0 || val > 1)
  435. return -EINVAL;
  436. mp->m_fail_unmount = val;
  437. return count;
  438. }
  439. XFS_SYSFS_ATTR_RW(fail_at_unmount);
  440. static struct attribute *xfs_error_attrs[] = {
  441. ATTR_LIST(max_retries),
  442. ATTR_LIST(retry_timeout_seconds),
  443. NULL,
  444. };
  445. static struct kobj_type xfs_error_cfg_ktype = {
  446. .release = xfs_sysfs_release,
  447. .sysfs_ops = &xfs_sysfs_ops,
  448. .default_attrs = xfs_error_attrs,
  449. };
  450. static struct kobj_type xfs_error_ktype = {
  451. .release = xfs_sysfs_release,
  452. .sysfs_ops = &xfs_sysfs_ops,
  453. };
  454. /*
  455. * Error initialization tables. These need to be ordered in the same
  456. * order as the enums used to index the array. All class init tables need to
  457. * define a "default" behaviour as the first entry, all other entries can be
  458. * empty.
  459. */
  460. struct xfs_error_init {
  461. char *name;
  462. int max_retries;
  463. int retry_timeout; /* in seconds */
  464. };
  465. static const struct xfs_error_init xfs_error_meta_init[XFS_ERR_ERRNO_MAX] = {
  466. { .name = "default",
  467. .max_retries = XFS_ERR_RETRY_FOREVER,
  468. .retry_timeout = XFS_ERR_RETRY_FOREVER,
  469. },
  470. { .name = "EIO",
  471. .max_retries = XFS_ERR_RETRY_FOREVER,
  472. .retry_timeout = XFS_ERR_RETRY_FOREVER,
  473. },
  474. { .name = "ENOSPC",
  475. .max_retries = XFS_ERR_RETRY_FOREVER,
  476. .retry_timeout = XFS_ERR_RETRY_FOREVER,
  477. },
  478. { .name = "ENODEV",
  479. .max_retries = 0, /* We can't recover from devices disappearing */
  480. .retry_timeout = 0,
  481. },
  482. };
  483. static int
  484. xfs_error_sysfs_init_class(
  485. struct xfs_mount *mp,
  486. int class,
  487. const char *parent_name,
  488. struct xfs_kobj *parent_kobj,
  489. const struct xfs_error_init init[])
  490. {
  491. struct xfs_error_cfg *cfg;
  492. int error;
  493. int i;
  494. ASSERT(class < XFS_ERR_CLASS_MAX);
  495. error = xfs_sysfs_init(parent_kobj, &xfs_error_ktype,
  496. &mp->m_error_kobj, parent_name);
  497. if (error)
  498. return error;
  499. for (i = 0; i < XFS_ERR_ERRNO_MAX; i++) {
  500. cfg = &mp->m_error_cfg[class][i];
  501. error = xfs_sysfs_init(&cfg->kobj, &xfs_error_cfg_ktype,
  502. parent_kobj, init[i].name);
  503. if (error)
  504. goto out_error;
  505. cfg->max_retries = init[i].max_retries;
  506. if (init[i].retry_timeout == XFS_ERR_RETRY_FOREVER)
  507. cfg->retry_timeout = XFS_ERR_RETRY_FOREVER;
  508. else
  509. cfg->retry_timeout = msecs_to_jiffies(
  510. init[i].retry_timeout * MSEC_PER_SEC);
  511. }
  512. return 0;
  513. out_error:
  514. /* unwind the entries that succeeded */
  515. for (i--; i >= 0; i--) {
  516. cfg = &mp->m_error_cfg[class][i];
  517. xfs_sysfs_del(&cfg->kobj);
  518. }
  519. xfs_sysfs_del(parent_kobj);
  520. return error;
  521. }
  522. int
  523. xfs_error_sysfs_init(
  524. struct xfs_mount *mp)
  525. {
  526. int error;
  527. /* .../xfs/<dev>/error/ */
  528. error = xfs_sysfs_init(&mp->m_error_kobj, &xfs_error_ktype,
  529. &mp->m_kobj, "error");
  530. if (error)
  531. return error;
  532. error = sysfs_create_file(&mp->m_error_kobj.kobject,
  533. ATTR_LIST(fail_at_unmount));
  534. if (error)
  535. goto out_error;
  536. /* .../xfs/<dev>/error/metadata/ */
  537. error = xfs_error_sysfs_init_class(mp, XFS_ERR_METADATA,
  538. "metadata", &mp->m_error_meta_kobj,
  539. xfs_error_meta_init);
  540. if (error)
  541. goto out_error;
  542. return 0;
  543. out_error:
  544. xfs_sysfs_del(&mp->m_error_kobj);
  545. return error;
  546. }
  547. void
  548. xfs_error_sysfs_del(
  549. struct xfs_mount *mp)
  550. {
  551. struct xfs_error_cfg *cfg;
  552. int i, j;
  553. for (i = 0; i < XFS_ERR_CLASS_MAX; i++) {
  554. for (j = 0; j < XFS_ERR_ERRNO_MAX; j++) {
  555. cfg = &mp->m_error_cfg[i][j];
  556. xfs_sysfs_del(&cfg->kobj);
  557. }
  558. }
  559. xfs_sysfs_del(&mp->m_error_meta_kobj);
  560. xfs_sysfs_del(&mp->m_error_kobj);
  561. }
  562. struct xfs_error_cfg *
  563. xfs_error_get_cfg(
  564. struct xfs_mount *mp,
  565. int error_class,
  566. int error)
  567. {
  568. struct xfs_error_cfg *cfg;
  569. if (error < 0)
  570. error = -error;
  571. switch (error) {
  572. case EIO:
  573. cfg = &mp->m_error_cfg[error_class][XFS_ERR_EIO];
  574. break;
  575. case ENOSPC:
  576. cfg = &mp->m_error_cfg[error_class][XFS_ERR_ENOSPC];
  577. break;
  578. case ENODEV:
  579. cfg = &mp->m_error_cfg[error_class][XFS_ERR_ENODEV];
  580. break;
  581. default:
  582. cfg = &mp->m_error_cfg[error_class][XFS_ERR_DEFAULT];
  583. break;
  584. }
  585. return cfg;
  586. }