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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_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}