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