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