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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
72struct 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#ifdef DEBUG
197/*
198 * Override how many threads the parallel work queue is allowed to create.
199 * This has to be a debug-only global (instead of an errortag) because one of
200 * the main users of parallel workqueues is mount time quotacheck.
201 */
202STATIC ssize_t
203pwork_threads_store(
204 struct kobject *kobject,
205 const char *buf,
206 size_t count)
207{
208 int ret;
209 int val;
210
211 ret = kstrtoint(buf, 0, &val);
212 if (ret)
213 return ret;
214
215 if (val < -1 || val > num_possible_cpus())
216 return -EINVAL;
217
218 xfs_globals.pwork_threads = val;
219
220 return count;
221}
222
223STATIC ssize_t
224pwork_threads_show(
225 struct kobject *kobject,
226 char *buf)
227{
228 return sysfs_emit(buf, "%d\n", xfs_globals.pwork_threads);
229}
230XFS_SYSFS_ATTR_RW(pwork_threads);
231
232static ssize_t
233larp_store(
234 struct kobject *kobject,
235 const char *buf,
236 size_t count)
237{
238 ssize_t ret;
239
240 ret = kstrtobool(buf, &xfs_globals.larp);
241 if (ret < 0)
242 return ret;
243 return count;
244}
245
246STATIC ssize_t
247larp_show(
248 struct kobject *kobject,
249 char *buf)
250{
251 return snprintf(buf, PAGE_SIZE, "%d\n", xfs_globals.larp);
252}
253XFS_SYSFS_ATTR_RW(larp);
254#endif /* DEBUG */
255
256static struct attribute *xfs_dbg_attrs[] = {
257 ATTR_LIST(bug_on_assert),
258 ATTR_LIST(log_recovery_delay),
259 ATTR_LIST(mount_delay),
260 ATTR_LIST(always_cow),
261#ifdef DEBUG
262 ATTR_LIST(pwork_threads),
263 ATTR_LIST(larp),
264#endif
265 NULL,
266};
267ATTRIBUTE_GROUPS(xfs_dbg);
268
269struct kobj_type xfs_dbg_ktype = {
270 .release = xfs_sysfs_release,
271 .sysfs_ops = &xfs_sysfs_ops,
272 .default_groups = xfs_dbg_groups,
273};
274
275#endif /* DEBUG */
276
277/* stats */
278
279static inline struct xstats *
280to_xstats(struct kobject *kobject)
281{
282 struct xfs_kobj *kobj = to_kobj(kobject);
283
284 return container_of(kobj, struct xstats, xs_kobj);
285}
286
287STATIC ssize_t
288stats_show(
289 struct kobject *kobject,
290 char *buf)
291{
292 struct xstats *stats = to_xstats(kobject);
293
294 return xfs_stats_format(stats->xs_stats, buf);
295}
296XFS_SYSFS_ATTR_RO(stats);
297
298STATIC ssize_t
299stats_clear_store(
300 struct kobject *kobject,
301 const char *buf,
302 size_t count)
303{
304 int ret;
305 int val;
306 struct xstats *stats = to_xstats(kobject);
307
308 ret = kstrtoint(buf, 0, &val);
309 if (ret)
310 return ret;
311
312 if (val != 1)
313 return -EINVAL;
314
315 xfs_stats_clearall(stats->xs_stats);
316 return count;
317}
318XFS_SYSFS_ATTR_WO(stats_clear);
319
320static struct attribute *xfs_stats_attrs[] = {
321 ATTR_LIST(stats),
322 ATTR_LIST(stats_clear),
323 NULL,
324};
325ATTRIBUTE_GROUPS(xfs_stats);
326
327struct kobj_type xfs_stats_ktype = {
328 .release = xfs_sysfs_release,
329 .sysfs_ops = &xfs_sysfs_ops,
330 .default_groups = xfs_stats_groups,
331};
332
333/* xlog */
334
335static inline struct xlog *
336to_xlog(struct kobject *kobject)
337{
338 struct xfs_kobj *kobj = to_kobj(kobject);
339
340 return container_of(kobj, struct xlog, l_kobj);
341}
342
343STATIC ssize_t
344log_head_lsn_show(
345 struct kobject *kobject,
346 char *buf)
347{
348 int cycle;
349 int block;
350 struct xlog *log = to_xlog(kobject);
351
352 spin_lock(&log->l_icloglock);
353 cycle = log->l_curr_cycle;
354 block = log->l_curr_block;
355 spin_unlock(&log->l_icloglock);
356
357 return sysfs_emit(buf, "%d:%d\n", cycle, block);
358}
359XFS_SYSFS_ATTR_RO(log_head_lsn);
360
361STATIC ssize_t
362log_tail_lsn_show(
363 struct kobject *kobject,
364 char *buf)
365{
366 int cycle;
367 int block;
368 struct xlog *log = to_xlog(kobject);
369
370 xlog_crack_atomic_lsn(&log->l_tail_lsn, &cycle, &block);
371 return sysfs_emit(buf, "%d:%d\n", cycle, block);
372}
373XFS_SYSFS_ATTR_RO(log_tail_lsn);
374
375STATIC ssize_t
376reserve_grant_head_show(
377 struct kobject *kobject,
378 char *buf)
379
380{
381 int cycle;
382 int bytes;
383 struct xlog *log = to_xlog(kobject);
384
385 xlog_crack_grant_head(&log->l_reserve_head.grant, &cycle, &bytes);
386 return sysfs_emit(buf, "%d:%d\n", cycle, bytes);
387}
388XFS_SYSFS_ATTR_RO(reserve_grant_head);
389
390STATIC ssize_t
391write_grant_head_show(
392 struct kobject *kobject,
393 char *buf)
394{
395 int cycle;
396 int bytes;
397 struct xlog *log = to_xlog(kobject);
398
399 xlog_crack_grant_head(&log->l_write_head.grant, &cycle, &bytes);
400 return sysfs_emit(buf, "%d:%d\n", cycle, bytes);
401}
402XFS_SYSFS_ATTR_RO(write_grant_head);
403
404static struct attribute *xfs_log_attrs[] = {
405 ATTR_LIST(log_head_lsn),
406 ATTR_LIST(log_tail_lsn),
407 ATTR_LIST(reserve_grant_head),
408 ATTR_LIST(write_grant_head),
409 NULL,
410};
411ATTRIBUTE_GROUPS(xfs_log);
412
413struct kobj_type xfs_log_ktype = {
414 .release = xfs_sysfs_release,
415 .sysfs_ops = &xfs_sysfs_ops,
416 .default_groups = xfs_log_groups,
417};
418
419/*
420 * Metadata IO error configuration
421 *
422 * The sysfs structure here is:
423 * ...xfs/<dev>/error/<class>/<errno>/<error_attrs>
424 *
425 * where <class> allows us to discriminate between data IO and metadata IO,
426 * and any other future type of IO (e.g. special inode or directory error
427 * handling) we care to support.
428 */
429static inline struct xfs_error_cfg *
430to_error_cfg(struct kobject *kobject)
431{
432 struct xfs_kobj *kobj = to_kobj(kobject);
433 return container_of(kobj, struct xfs_error_cfg, kobj);
434}
435
436static inline struct xfs_mount *
437err_to_mp(struct kobject *kobject)
438{
439 struct xfs_kobj *kobj = to_kobj(kobject);
440 return container_of(kobj, struct xfs_mount, m_error_kobj);
441}
442
443static ssize_t
444max_retries_show(
445 struct kobject *kobject,
446 char *buf)
447{
448 int retries;
449 struct xfs_error_cfg *cfg = to_error_cfg(kobject);
450
451 if (cfg->max_retries == XFS_ERR_RETRY_FOREVER)
452 retries = -1;
453 else
454 retries = cfg->max_retries;
455
456 return sysfs_emit(buf, "%d\n", retries);
457}
458
459static ssize_t
460max_retries_store(
461 struct kobject *kobject,
462 const char *buf,
463 size_t count)
464{
465 struct xfs_error_cfg *cfg = to_error_cfg(kobject);
466 int ret;
467 int val;
468
469 ret = kstrtoint(buf, 0, &val);
470 if (ret)
471 return ret;
472
473 if (val < -1)
474 return -EINVAL;
475
476 if (val == -1)
477 cfg->max_retries = XFS_ERR_RETRY_FOREVER;
478 else
479 cfg->max_retries = val;
480 return count;
481}
482XFS_SYSFS_ATTR_RW(max_retries);
483
484static ssize_t
485retry_timeout_seconds_show(
486 struct kobject *kobject,
487 char *buf)
488{
489 int timeout;
490 struct xfs_error_cfg *cfg = to_error_cfg(kobject);
491
492 if (cfg->retry_timeout == XFS_ERR_RETRY_FOREVER)
493 timeout = -1;
494 else
495 timeout = jiffies_to_msecs(cfg->retry_timeout) / MSEC_PER_SEC;
496
497 return sysfs_emit(buf, "%d\n", timeout);
498}
499
500static ssize_t
501retry_timeout_seconds_store(
502 struct kobject *kobject,
503 const char *buf,
504 size_t count)
505{
506 struct xfs_error_cfg *cfg = to_error_cfg(kobject);
507 int ret;
508 int val;
509
510 ret = kstrtoint(buf, 0, &val);
511 if (ret)
512 return ret;
513
514 /* 1 day timeout maximum, -1 means infinite */
515 if (val < -1 || val > 86400)
516 return -EINVAL;
517
518 if (val == -1)
519 cfg->retry_timeout = XFS_ERR_RETRY_FOREVER;
520 else {
521 cfg->retry_timeout = msecs_to_jiffies(val * MSEC_PER_SEC);
522 ASSERT(msecs_to_jiffies(val * MSEC_PER_SEC) < LONG_MAX);
523 }
524 return count;
525}
526XFS_SYSFS_ATTR_RW(retry_timeout_seconds);
527
528static ssize_t
529fail_at_unmount_show(
530 struct kobject *kobject,
531 char *buf)
532{
533 struct xfs_mount *mp = err_to_mp(kobject);
534
535 return sysfs_emit(buf, "%d\n", mp->m_fail_unmount);
536}
537
538static ssize_t
539fail_at_unmount_store(
540 struct kobject *kobject,
541 const char *buf,
542 size_t count)
543{
544 struct xfs_mount *mp = err_to_mp(kobject);
545 int ret;
546 int val;
547
548 ret = kstrtoint(buf, 0, &val);
549 if (ret)
550 return ret;
551
552 if (val < 0 || val > 1)
553 return -EINVAL;
554
555 mp->m_fail_unmount = val;
556 return count;
557}
558XFS_SYSFS_ATTR_RW(fail_at_unmount);
559
560static struct attribute *xfs_error_attrs[] = {
561 ATTR_LIST(max_retries),
562 ATTR_LIST(retry_timeout_seconds),
563 NULL,
564};
565ATTRIBUTE_GROUPS(xfs_error);
566
567static struct kobj_type xfs_error_cfg_ktype = {
568 .release = xfs_sysfs_release,
569 .sysfs_ops = &xfs_sysfs_ops,
570 .default_groups = xfs_error_groups,
571};
572
573static struct kobj_type xfs_error_ktype = {
574 .release = xfs_sysfs_release,
575 .sysfs_ops = &xfs_sysfs_ops,
576};
577
578/*
579 * Error initialization tables. These need to be ordered in the same
580 * order as the enums used to index the array. All class init tables need to
581 * define a "default" behaviour as the first entry, all other entries can be
582 * empty.
583 */
584struct xfs_error_init {
585 char *name;
586 int max_retries;
587 int retry_timeout; /* in seconds */
588};
589
590static const struct xfs_error_init xfs_error_meta_init[XFS_ERR_ERRNO_MAX] = {
591 { .name = "default",
592 .max_retries = XFS_ERR_RETRY_FOREVER,
593 .retry_timeout = XFS_ERR_RETRY_FOREVER,
594 },
595 { .name = "EIO",
596 .max_retries = XFS_ERR_RETRY_FOREVER,
597 .retry_timeout = XFS_ERR_RETRY_FOREVER,
598 },
599 { .name = "ENOSPC",
600 .max_retries = XFS_ERR_RETRY_FOREVER,
601 .retry_timeout = XFS_ERR_RETRY_FOREVER,
602 },
603 { .name = "ENODEV",
604 .max_retries = 0, /* We can't recover from devices disappearing */
605 .retry_timeout = 0,
606 },
607};
608
609static int
610xfs_error_sysfs_init_class(
611 struct xfs_mount *mp,
612 int class,
613 const char *parent_name,
614 struct xfs_kobj *parent_kobj,
615 const struct xfs_error_init init[])
616{
617 struct xfs_error_cfg *cfg;
618 int error;
619 int i;
620
621 ASSERT(class < XFS_ERR_CLASS_MAX);
622
623 error = xfs_sysfs_init(parent_kobj, &xfs_error_ktype,
624 &mp->m_error_kobj, parent_name);
625 if (error)
626 return error;
627
628 for (i = 0; i < XFS_ERR_ERRNO_MAX; i++) {
629 cfg = &mp->m_error_cfg[class][i];
630 error = xfs_sysfs_init(&cfg->kobj, &xfs_error_cfg_ktype,
631 parent_kobj, init[i].name);
632 if (error)
633 goto out_error;
634
635 cfg->max_retries = init[i].max_retries;
636 if (init[i].retry_timeout == XFS_ERR_RETRY_FOREVER)
637 cfg->retry_timeout = XFS_ERR_RETRY_FOREVER;
638 else
639 cfg->retry_timeout = msecs_to_jiffies(
640 init[i].retry_timeout * MSEC_PER_SEC);
641 }
642 return 0;
643
644out_error:
645 /* unwind the entries that succeeded */
646 for (i--; i >= 0; i--) {
647 cfg = &mp->m_error_cfg[class][i];
648 xfs_sysfs_del(&cfg->kobj);
649 }
650 xfs_sysfs_del(parent_kobj);
651 return error;
652}
653
654int
655xfs_error_sysfs_init(
656 struct xfs_mount *mp)
657{
658 int error;
659
660 /* .../xfs/<dev>/error/ */
661 error = xfs_sysfs_init(&mp->m_error_kobj, &xfs_error_ktype,
662 &mp->m_kobj, "error");
663 if (error)
664 return error;
665
666 error = sysfs_create_file(&mp->m_error_kobj.kobject,
667 ATTR_LIST(fail_at_unmount));
668
669 if (error)
670 goto out_error;
671
672 /* .../xfs/<dev>/error/metadata/ */
673 error = xfs_error_sysfs_init_class(mp, XFS_ERR_METADATA,
674 "metadata", &mp->m_error_meta_kobj,
675 xfs_error_meta_init);
676 if (error)
677 goto out_error;
678
679 return 0;
680
681out_error:
682 xfs_sysfs_del(&mp->m_error_kobj);
683 return error;
684}
685
686void
687xfs_error_sysfs_del(
688 struct xfs_mount *mp)
689{
690 struct xfs_error_cfg *cfg;
691 int i, j;
692
693 for (i = 0; i < XFS_ERR_CLASS_MAX; i++) {
694 for (j = 0; j < XFS_ERR_ERRNO_MAX; j++) {
695 cfg = &mp->m_error_cfg[i][j];
696
697 xfs_sysfs_del(&cfg->kobj);
698 }
699 }
700 xfs_sysfs_del(&mp->m_error_meta_kobj);
701 xfs_sysfs_del(&mp->m_error_kobj);
702}
703
704struct xfs_error_cfg *
705xfs_error_get_cfg(
706 struct xfs_mount *mp,
707 int error_class,
708 int error)
709{
710 struct xfs_error_cfg *cfg;
711
712 if (error < 0)
713 error = -error;
714
715 switch (error) {
716 case EIO:
717 cfg = &mp->m_error_cfg[error_class][XFS_ERR_EIO];
718 break;
719 case ENOSPC:
720 cfg = &mp->m_error_cfg[error_class][XFS_ERR_ENOSPC];
721 break;
722 case ENODEV:
723 cfg = &mp->m_error_cfg[error_class][XFS_ERR_ENODEV];
724 break;
725 default:
726 cfg = &mp->m_error_cfg[error_class][XFS_ERR_DEFAULT];
727 break;
728 }
729
730 return cfg;
731}