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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
  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
 17struct 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
 24static inline struct xfs_sysfs_attr *
 25to_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
 39STATIC ssize_t
 40xfs_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
 50STATIC ssize_t
 51xfs_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
 62static const struct sysfs_ops xfs_sysfs_ops = {
 63	.show = xfs_sysfs_object_show,
 64	.store = xfs_sysfs_object_store,
 65};
 66
 67static struct attribute *xfs_mp_attrs[] = {
 68	NULL,
 69};
 70ATTRIBUTE_GROUPS(xfs_mp);
 71
 72const 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
 81STATIC ssize_t
 82bug_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
104STATIC ssize_t
105bug_on_assert_show(
106	struct kobject		*kobject,
107	char			*buf)
108{
109	return sysfs_emit(buf, "%d\n", xfs_globals.bug_on_assert);
110}
111XFS_SYSFS_ATTR_RW(bug_on_assert);
112
113STATIC ssize_t
114log_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
134STATIC ssize_t
135log_recovery_delay_show(
136	struct kobject	*kobject,
137	char		*buf)
138{
139	return sysfs_emit(buf, "%d\n", xfs_globals.log_recovery_delay);
140}
141XFS_SYSFS_ATTR_RW(log_recovery_delay);
142
143STATIC ssize_t
144mount_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
164STATIC ssize_t
165mount_delay_show(
166	struct kobject	*kobject,
167	char		*buf)
168{
169	return sysfs_emit(buf, "%d\n", xfs_globals.mount_delay);
170}
171XFS_SYSFS_ATTR_RW(mount_delay);
172
173static ssize_t
174always_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
187static ssize_t
188always_cow_show(
189	struct kobject	*kobject,
190	char		*buf)
191{
192	return sysfs_emit(buf, "%d\n", xfs_globals.always_cow);
193}
194XFS_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 */
201STATIC ssize_t
202pwork_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
222STATIC ssize_t
223pwork_threads_show(
224	struct kobject	*kobject,
225	char		*buf)
226{
227	return sysfs_emit(buf, "%d\n", xfs_globals.pwork_threads);
228}
229XFS_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 */
240static ssize_t
241larp_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
254STATIC ssize_t
255larp_show(
256	struct kobject	*kobject,
257	char		*buf)
258{
259	return snprintf(buf, PAGE_SIZE, "%d\n", xfs_globals.larp);
260}
261XFS_SYSFS_ATTR_RW(larp);
262
263STATIC ssize_t
264bload_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
280STATIC ssize_t
281bload_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}
287XFS_SYSFS_ATTR_RW(bload_leaf_slack);
288
289STATIC ssize_t
290bload_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
306STATIC ssize_t
307bload_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}
313XFS_SYSFS_ATTR_RW(bload_node_slack);
314
315static 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};
326ATTRIBUTE_GROUPS(xfs_dbg);
327
328const 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
338static inline struct xstats *
339to_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
346STATIC ssize_t
347stats_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}
355XFS_SYSFS_ATTR_RO(stats);
356
357STATIC ssize_t
358stats_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}
377XFS_SYSFS_ATTR_WO(stats_clear);
378
379static struct attribute *xfs_stats_attrs[] = {
380	ATTR_LIST(stats),
381	ATTR_LIST(stats_clear),
382	NULL,
383};
384ATTRIBUTE_GROUPS(xfs_stats);
385
386const 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
394static inline struct xlog *
395to_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
402STATIC ssize_t
403log_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}
418XFS_SYSFS_ATTR_RO(log_head_lsn);
419
420STATIC ssize_t
421log_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}
432XFS_SYSFS_ATTR_RO(log_tail_lsn);
433
434STATIC ssize_t
435reserve_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}
442XFS_SYSFS_ATTR_RO(reserve_grant_head_bytes);
443
444STATIC ssize_t
445write_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}
452XFS_SYSFS_ATTR_RO(write_grant_head_bytes);
453
454static 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};
461ATTRIBUTE_GROUPS(xfs_log);
462
463const 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 */
479static inline struct xfs_error_cfg *
480to_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
486static inline struct xfs_mount *
487err_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
493static ssize_t
494max_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
509static ssize_t
510max_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}
532XFS_SYSFS_ATTR_RW(max_retries);
533
534static ssize_t
535retry_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
550static ssize_t
551retry_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}
576XFS_SYSFS_ATTR_RW(retry_timeout_seconds);
577
578static ssize_t
579fail_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
588static ssize_t
589fail_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}
608XFS_SYSFS_ATTR_RW(fail_at_unmount);
609
610static struct attribute *xfs_error_attrs[] = {
611	ATTR_LIST(max_retries),
612	ATTR_LIST(retry_timeout_seconds),
613	NULL,
614};
615ATTRIBUTE_GROUPS(xfs_error);
616
617static 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
623static 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 */
634struct xfs_error_init {
635	char		*name;
636	int		max_retries;
637	int		retry_timeout;	/* in seconds */
638};
639
640static 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
659static int
660xfs_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
694out_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
704int
705xfs_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
731out_error:
732	xfs_sysfs_del(&mp->m_error_kobj);
733	return error;
734}
735
736void
737xfs_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
754struct xfs_error_cfg *
755xfs_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}