[linux-block.git] / fs / xfs / xfs_sysfs.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2014 Red Hat, Inc.
 * All Rights Reserved.
 */

#include "xfs.h"
#include "xfs_shared.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_sysfs.h"
#include "xfs_log.h"
#include "xfs_log_priv.h"
#include "xfs_mount.h"

struct xfs_sysfs_attr {
	struct attribute attr;
	ssize_t (*show)(struct kobject *kobject, char *buf);
	ssize_t (*store)(struct kobject *kobject, const char *buf,
			 size_t count);
};

static inline struct xfs_sysfs_attr *
to_attr(struct attribute *attr)
{
	return container_of(attr, struct xfs_sysfs_attr, attr);
}

#define XFS_SYSFS_ATTR_RW(name) \
	static struct xfs_sysfs_attr xfs_sysfs_attr_##name = __ATTR_RW(name)
#define XFS_SYSFS_ATTR_RO(name) \
	static struct xfs_sysfs_attr xfs_sysfs_attr_##name = __ATTR_RO(name)
#define XFS_SYSFS_ATTR_WO(name) \
	static struct xfs_sysfs_attr xfs_sysfs_attr_##name = __ATTR_WO(name)

#define ATTR_LIST(name) &xfs_sysfs_attr_##name.attr

STATIC ssize_t
xfs_sysfs_object_show(
	struct kobject		*kobject,
	struct attribute	*attr,
	char			*buf)
{
	struct xfs_sysfs_attr *xfs_attr = to_attr(attr);

	return xfs_attr->show ? xfs_attr->show(kobject, buf) : 0;
}

STATIC ssize_t
xfs_sysfs_object_store(
	struct kobject		*kobject,
	struct attribute	*attr,
	const char		*buf,
	size_t			count)
{
	struct xfs_sysfs_attr *xfs_attr = to_attr(attr);

	return xfs_attr->store ? xfs_attr->store(kobject, buf, count) : 0;
}

static const struct sysfs_ops xfs_sysfs_ops = {
	.show = xfs_sysfs_object_show,
	.store = xfs_sysfs_object_store,
};

static struct attribute *xfs_mp_attrs[] = {
	NULL,
};
ATTRIBUTE_GROUPS(xfs_mp);

const struct kobj_type xfs_mp_ktype = {
	.release = xfs_sysfs_release,
	.sysfs_ops = &xfs_sysfs_ops,
	.default_groups = xfs_mp_groups,
};

#ifdef DEBUG
/* debug */

STATIC ssize_t
bug_on_assert_store(
	struct kobject		*kobject,
	const char		*buf,
	size_t			count)
{
	int			ret;
	int			val;

	ret = kstrtoint(buf, 0, &val);
	if (ret)
		return ret;

	if (val == 1)
		xfs_globals.bug_on_assert = true;
	else if (val == 0)
		xfs_globals.bug_on_assert = false;
	else
		return -EINVAL;

	return count;
}

STATIC ssize_t
bug_on_assert_show(
	struct kobject		*kobject,
	char			*buf)
{
	return sysfs_emit(buf, "%d\n", xfs_globals.bug_on_assert);
}
XFS_SYSFS_ATTR_RW(bug_on_assert);

STATIC ssize_t
log_recovery_delay_store(
	struct kobject	*kobject,
	const char	*buf,
	size_t		count)
{
	int		ret;
	int		val;

	ret = kstrtoint(buf, 0, &val);
	if (ret)
		return ret;

	if (val < 0 || val > 60)
		return -EINVAL;

	xfs_globals.log_recovery_delay = val;

	return count;
}

STATIC ssize_t
log_recovery_delay_show(
	struct kobject	*kobject,
	char		*buf)
{
	return sysfs_emit(buf, "%d\n", xfs_globals.log_recovery_delay);
}
XFS_SYSFS_ATTR_RW(log_recovery_delay);

STATIC ssize_t
mount_delay_store(
	struct kobject	*kobject,
	const char	*buf,
	size_t		count)
{
	int		ret;
	int		val;

	ret = kstrtoint(buf, 0, &val);
	if (ret)
		return ret;

	if (val < 0 || val > 60)
		return -EINVAL;

	xfs_globals.mount_delay = val;

	return count;
}

STATIC ssize_t
mount_delay_show(
	struct kobject	*kobject,
	char		*buf)
{
	return sysfs_emit(buf, "%d\n", xfs_globals.mount_delay);
}
XFS_SYSFS_ATTR_RW(mount_delay);

static ssize_t
always_cow_store(
	struct kobject	*kobject,
	const char	*buf,
	size_t		count)
{
	ssize_t		ret;

	ret = kstrtobool(buf, &xfs_globals.always_cow);
	if (ret < 0)
		return ret;
	return count;
}

static ssize_t
always_cow_show(
	struct kobject	*kobject,
	char		*buf)
{
	return sysfs_emit(buf, "%d\n", xfs_globals.always_cow);
}
XFS_SYSFS_ATTR_RW(always_cow);

#ifdef DEBUG
/*
 * Override how many threads the parallel work queue is allowed to create.
 * This has to be a debug-only global (instead of an errortag) because one of
 * the main users of parallel workqueues is mount time quotacheck.
 */
STATIC ssize_t
pwork_threads_store(
	struct kobject	*kobject,
	const char	*buf,
	size_t		count)
{
	int		ret;
	int		val;

	ret = kstrtoint(buf, 0, &val);
	if (ret)
		return ret;

	if (val < -1 || val > num_possible_cpus())
		return -EINVAL;

	xfs_globals.pwork_threads = val;

	return count;
}

STATIC ssize_t
pwork_threads_show(
	struct kobject	*kobject,
	char		*buf)
{
	return sysfs_emit(buf, "%d\n", xfs_globals.pwork_threads);
}
XFS_SYSFS_ATTR_RW(pwork_threads);

static ssize_t
larp_store(
	struct kobject	*kobject,
	const char	*buf,
	size_t		count)
{
	ssize_t		ret;

	ret = kstrtobool(buf, &xfs_globals.larp);
	if (ret < 0)
		return ret;
	return count;
}

STATIC ssize_t
larp_show(
	struct kobject	*kobject,
	char		*buf)
{
	return snprintf(buf, PAGE_SIZE, "%d\n", xfs_globals.larp);
}
XFS_SYSFS_ATTR_RW(larp);
#endif /* DEBUG */

static struct attribute *xfs_dbg_attrs[] = {
	ATTR_LIST(bug_on_assert),
	ATTR_LIST(log_recovery_delay),
	ATTR_LIST(mount_delay),
	ATTR_LIST(always_cow),
#ifdef DEBUG
	ATTR_LIST(pwork_threads),
	ATTR_LIST(larp),
#endif
	NULL,
};
ATTRIBUTE_GROUPS(xfs_dbg);

const struct kobj_type xfs_dbg_ktype = {
	.release = xfs_sysfs_release,
	.sysfs_ops = &xfs_sysfs_ops,
	.default_groups = xfs_dbg_groups,
};

#endif /* DEBUG */

/* stats */

static inline struct xstats *
to_xstats(struct kobject *kobject)
{
	struct xfs_kobj *kobj = to_kobj(kobject);

	return container_of(kobj, struct xstats, xs_kobj);
}

STATIC ssize_t
stats_show(
	struct kobject	*kobject,
	char		*buf)
{
	struct xstats	*stats = to_xstats(kobject);

	return xfs_stats_format(stats->xs_stats, buf);
}
XFS_SYSFS_ATTR_RO(stats);

STATIC ssize_t
stats_clear_store(
	struct kobject	*kobject,
	const char	*buf,
	size_t		count)
{
	int		ret;
	int		val;
	struct xstats	*stats = to_xstats(kobject);

	ret = kstrtoint(buf, 0, &val);
	if (ret)
		return ret;

	if (val != 1)
		return -EINVAL;

	xfs_stats_clearall(stats->xs_stats);
	return count;
}
XFS_SYSFS_ATTR_WO(stats_clear);

static struct attribute *xfs_stats_attrs[] = {
	ATTR_LIST(stats),
	ATTR_LIST(stats_clear),
	NULL,
};
ATTRIBUTE_GROUPS(xfs_stats);

const struct kobj_type xfs_stats_ktype = {
	.release = xfs_sysfs_release,
	.sysfs_ops = &xfs_sysfs_ops,
	.default_groups = xfs_stats_groups,
};

/* xlog */

static inline struct xlog *
to_xlog(struct kobject *kobject)
{
	struct xfs_kobj *kobj = to_kobj(kobject);

	return container_of(kobj, struct xlog, l_kobj);
}

STATIC ssize_t
log_head_lsn_show(
	struct kobject	*kobject,
	char		*buf)
{
	int cycle;
	int block;
	struct xlog *log = to_xlog(kobject);

	spin_lock(&log->l_icloglock);
	cycle = log->l_curr_cycle;
	block = log->l_curr_block;
	spin_unlock(&log->l_icloglock);

	return sysfs_emit(buf, "%d:%d\n", cycle, block);
}
XFS_SYSFS_ATTR_RO(log_head_lsn);

STATIC ssize_t
log_tail_lsn_show(
	struct kobject	*kobject,
	char		*buf)
{
	int cycle;
	int block;
	struct xlog *log = to_xlog(kobject);

	xlog_crack_atomic_lsn(&log->l_tail_lsn, &cycle, &block);
	return sysfs_emit(buf, "%d:%d\n", cycle, block);
}
XFS_SYSFS_ATTR_RO(log_tail_lsn);

STATIC ssize_t
reserve_grant_head_show(
	struct kobject	*kobject,
	char		*buf)

{
	int cycle;
	int bytes;
	struct xlog *log = to_xlog(kobject);

	xlog_crack_grant_head(&log->l_reserve_head.grant, &cycle, &bytes);
	return sysfs_emit(buf, "%d:%d\n", cycle, bytes);
}
XFS_SYSFS_ATTR_RO(reserve_grant_head);

STATIC ssize_t
write_grant_head_show(
	struct kobject	*kobject,
	char		*buf)
{
	int cycle;
	int bytes;
	struct xlog *log = to_xlog(kobject);

	xlog_crack_grant_head(&log->l_write_head.grant, &cycle, &bytes);
	return sysfs_emit(buf, "%d:%d\n", cycle, bytes);
}
XFS_SYSFS_ATTR_RO(write_grant_head);

static struct attribute *xfs_log_attrs[] = {
	ATTR_LIST(log_head_lsn),
	ATTR_LIST(log_tail_lsn),
	ATTR_LIST(reserve_grant_head),
	ATTR_LIST(write_grant_head),
	NULL,
};
ATTRIBUTE_GROUPS(xfs_log);

const struct kobj_type xfs_log_ktype = {
	.release = xfs_sysfs_release,
	.sysfs_ops = &xfs_sysfs_ops,
	.default_groups = xfs_log_groups,
};

/*
 * Metadata IO error configuration
 *
 * The sysfs structure here is:
 *	...xfs/<dev>/error/<class>/<errno>/<error_attrs>
 *
 * where <class> allows us to discriminate between data IO and metadata IO,
 * and any other future type of IO (e.g. special inode or directory error
 * handling) we care to support.
 */
static inline struct xfs_error_cfg *
to_error_cfg(struct kobject *kobject)
{
	struct xfs_kobj *kobj = to_kobj(kobject);
	return container_of(kobj, struct xfs_error_cfg, kobj);
}

static inline struct xfs_mount *
err_to_mp(struct kobject *kobject)
{
	struct xfs_kobj *kobj = to_kobj(kobject);
	return container_of(kobj, struct xfs_mount, m_error_kobj);
}

static ssize_t
max_retries_show(
	struct kobject	*kobject,
	char		*buf)
{
	int		retries;
	struct xfs_error_cfg *cfg = to_error_cfg(kobject);

	if (cfg->max_retries == XFS_ERR_RETRY_FOREVER)
		retries = -1;
	else
		retries = cfg->max_retries;

	return sysfs_emit(buf, "%d\n", retries);
}

static ssize_t
max_retries_store(
	struct kobject	*kobject,
	const char	*buf,
	size_t		count)
{
	struct xfs_error_cfg *cfg = to_error_cfg(kobject);
	int		ret;
	int		val;

	ret = kstrtoint(buf, 0, &val);
	if (ret)
		return ret;

	if (val < -1)
		return -EINVAL;

	if (val == -1)
		cfg->max_retries = XFS_ERR_RETRY_FOREVER;
	else
		cfg->max_retries = val;
	return count;
}
XFS_SYSFS_ATTR_RW(max_retries);

static ssize_t
retry_timeout_seconds_show(
	struct kobject	*kobject,
	char		*buf)
{
	int		timeout;
	struct xfs_error_cfg *cfg = to_error_cfg(kobject);

	if (cfg->retry_timeout == XFS_ERR_RETRY_FOREVER)
		timeout = -1;
	else
		timeout = jiffies_to_msecs(cfg->retry_timeout) / MSEC_PER_SEC;

	return sysfs_emit(buf, "%d\n", timeout);
}

static ssize_t
retry_timeout_seconds_store(
	struct kobject	*kobject,
	const char	*buf,
	size_t		count)
{
	struct xfs_error_cfg *cfg = to_error_cfg(kobject);
	int		ret;
	int		val;

	ret = kstrtoint(buf, 0, &val);
	if (ret)
		return ret;

	/* 1 day timeout maximum, -1 means infinite */
	if (val < -1 || val > 86400)
		return -EINVAL;

	if (val == -1)
		cfg->retry_timeout = XFS_ERR_RETRY_FOREVER;
	else {
		cfg->retry_timeout = msecs_to_jiffies(val * MSEC_PER_SEC);
		ASSERT(msecs_to_jiffies(val * MSEC_PER_SEC) < LONG_MAX);
	}
	return count;
}
XFS_SYSFS_ATTR_RW(retry_timeout_seconds);

static ssize_t
fail_at_unmount_show(
	struct kobject	*kobject,
	char		*buf)
{
	struct xfs_mount	*mp = err_to_mp(kobject);

	return sysfs_emit(buf, "%d\n", mp->m_fail_unmount);
}

static ssize_t
fail_at_unmount_store(
	struct kobject	*kobject,
	const char	*buf,
	size_t		count)
{
	struct xfs_mount	*mp = err_to_mp(kobject);
	int		ret;
	int		val;

	ret = kstrtoint(buf, 0, &val);
	if (ret)
		return ret;

	if (val < 0 || val > 1)
		return -EINVAL;

	mp->m_fail_unmount = val;
	return count;
}
XFS_SYSFS_ATTR_RW(fail_at_unmount);

static struct attribute *xfs_error_attrs[] = {
	ATTR_LIST(max_retries),
	ATTR_LIST(retry_timeout_seconds),
	NULL,
};
ATTRIBUTE_GROUPS(xfs_error);

static const struct kobj_type xfs_error_cfg_ktype = {
	.release = xfs_sysfs_release,
	.sysfs_ops = &xfs_sysfs_ops,
	.default_groups = xfs_error_groups,
};

static const struct kobj_type xfs_error_ktype = {
	.release = xfs_sysfs_release,
	.sysfs_ops = &xfs_sysfs_ops,
};

/*
 * Error initialization tables. These need to be ordered in the same
 * order as the enums used to index the array. All class init tables need to
 * define a "default" behaviour as the first entry, all other entries can be
 * empty.
 */
struct xfs_error_init {
	char		*name;
	int		max_retries;
	int		retry_timeout;	/* in seconds */
};

static const struct xfs_error_init xfs_error_meta_init[XFS_ERR_ERRNO_MAX] = {
	{ .name = "default",
	  .max_retries = XFS_ERR_RETRY_FOREVER,
	  .retry_timeout = XFS_ERR_RETRY_FOREVER,
	},
	{ .name = "EIO",
	  .max_retries = XFS_ERR_RETRY_FOREVER,
	  .retry_timeout = XFS_ERR_RETRY_FOREVER,
	},
	{ .name = "ENOSPC",
	  .max_retries = XFS_ERR_RETRY_FOREVER,
	  .retry_timeout = XFS_ERR_RETRY_FOREVER,
	},
	{ .name = "ENODEV",
	  .max_retries = 0,	/* We can't recover from devices disappearing */
	  .retry_timeout = 0,
	},
};

static int
xfs_error_sysfs_init_class(
	struct xfs_mount	*mp,
	int			class,
	const char		*parent_name,
	struct xfs_kobj		*parent_kobj,
	const struct xfs_error_init init[])
{
	struct xfs_error_cfg	*cfg;
	int			error;
	int			i;

	ASSERT(class < XFS_ERR_CLASS_MAX);

	error = xfs_sysfs_init(parent_kobj, &xfs_error_ktype,
				&mp->m_error_kobj, parent_name);
	if (error)
		return error;

	for (i = 0; i < XFS_ERR_ERRNO_MAX; i++) {
		cfg = &mp->m_error_cfg[class][i];
		error = xfs_sysfs_init(&cfg->kobj, &xfs_error_cfg_ktype,
					parent_kobj, init[i].name);
		if (error)
			goto out_error;

		cfg->max_retries = init[i].max_retries;
		if (init[i].retry_timeout == XFS_ERR_RETRY_FOREVER)
			cfg->retry_timeout = XFS_ERR_RETRY_FOREVER;
		else
			cfg->retry_timeout = msecs_to_jiffies(
					init[i].retry_timeout * MSEC_PER_SEC);
	}
	return 0;

out_error:
	/* unwind the entries that succeeded */
	for (i--; i >= 0; i--) {
		cfg = &mp->m_error_cfg[class][i];
		xfs_sysfs_del(&cfg->kobj);
	}
	xfs_sysfs_del(parent_kobj);
	return error;
}

int
xfs_error_sysfs_init(
	struct xfs_mount	*mp)
{
	int			error;

	/* .../xfs/<dev>/error/ */
	error = xfs_sysfs_init(&mp->m_error_kobj, &xfs_error_ktype,
				&mp->m_kobj, "error");
	if (error)
		return error;

	error = sysfs_create_file(&mp->m_error_kobj.kobject,
				  ATTR_LIST(fail_at_unmount));

	if (error)
		goto out_error;

	/* .../xfs/<dev>/error/metadata/ */
	error = xfs_error_sysfs_init_class(mp, XFS_ERR_METADATA,
				"metadata", &mp->m_error_meta_kobj,
				xfs_error_meta_init);
	if (error)
		goto out_error;

	return 0;

out_error:
	xfs_sysfs_del(&mp->m_error_kobj);
	return error;
}

void
xfs_error_sysfs_del(
	struct xfs_mount	*mp)
{
	struct xfs_error_cfg	*cfg;
	int			i, j;

	for (i = 0; i < XFS_ERR_CLASS_MAX; i++) {
		for (j = 0; j < XFS_ERR_ERRNO_MAX; j++) {
			cfg = &mp->m_error_cfg[i][j];

			xfs_sysfs_del(&cfg->kobj);
		}
	}
	xfs_sysfs_del(&mp->m_error_meta_kobj);
	xfs_sysfs_del(&mp->m_error_kobj);
}

struct xfs_error_cfg *
xfs_error_get_cfg(
	struct xfs_mount	*mp,
	int			error_class,
	int			error)
{
	struct xfs_error_cfg	*cfg;

	if (error < 0)
		error = -error;

	switch (error) {
	case EIO:
		cfg = &mp->m_error_cfg[error_class][XFS_ERR_EIO];
		break;
	case ENOSPC:
		cfg = &mp->m_error_cfg[error_class][XFS_ERR_ENOSPC];
		break;
	case ENODEV:
		cfg = &mp->m_error_cfg[error_class][XFS_ERR_ENODEV];
		break;
	default:
		cfg = &mp->m_error_cfg[error_class][XFS_ERR_DEFAULT];
		break;
	}

	return cfg;
}
Commit	Line	Data
0b61f8a4	1	// SPDX-License-Identifier: GPL-2.0
a31b1d3d BF	2	/*
	3	* Copyright (c) 2014 Red Hat, Inc.
	4	* All Rights Reserved.
a31b1d3d BF	5	*/
	6
	7	#include "xfs.h"
192852be	8	#include "xfs_shared.h"
801cc4e1	9	#include "xfs_format.h"
baff4e44	10	#include "xfs_log_format.h"
801cc4e1	11	#include "xfs_trans_resv.h"
192852be	12	#include "xfs_sysfs.h"
0020a190	13	#include "xfs_log.h"
baff4e44	14	#include "xfs_log_priv.h"
801cc4e1	15	#include "xfs_mount.h"
a31b1d3d BF	16
	17	struct xfs_sysfs_attr {
	18	struct attribute attr;
a27c2640 BD	19	ssize_t (show)(struct kobject kobject, char *buf);
	20	ssize_t (store)(struct kobject kobject, const char *buf,
	21	size_t count);
a31b1d3d BF	22	};
	23
	24	static inline struct xfs_sysfs_attr *
	25	to_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)
bb230c12 BD	34	#define XFS_SYSFS_ATTR_WO(name) \
bb230c12 BD	35	static struct xfs_sysfs_attr xfs_sysfs_attr_##name = __ATTR_WO(name)
a31b1d3d BF	36
	37	#define ATTR_LIST(name) &xfs_sysfs_attr_##name.attr
	38
a27c2640 BD	39	STATIC ssize_t
	40	xfs_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
	50	STATIC ssize_t
	51	xfs_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
	62	static const struct sysfs_ops xfs_sysfs_ops = {
	63	.show = xfs_sysfs_object_show,
	64	.store = xfs_sysfs_object_store,
	65	};
	66
801cc4e1	67	static struct attribute *xfs_mp_attrs[] = {
801cc4e1 BF	68	NULL,
801cc4e1 BF	69	};
219aac5d	70	ATTRIBUTE_GROUPS(xfs_mp);
801cc4e1	71
2ee83335	72	const struct kobj_type xfs_mp_ktype = {
801cc4e1 BF	73	.release = xfs_sysfs_release,
801cc4e1 BF	74	.sysfs_ops = &xfs_sysfs_ops,
219aac5d	75	.default_groups = xfs_mp_groups,
801cc4e1 BF	76	};
801cc4e1 BF	77
65b65735 BF	78	#ifdef DEBUG
	79	/* debug */
	80
ccdab3d6 BF	81	STATIC ssize_t
	82	bug_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
	104	STATIC ssize_t
	105	bug_on_assert_show(
	106	struct kobject *kobject,
	107	char *buf)
	108	{
53eb47b4	109	return sysfs_emit(buf, "%d\n", xfs_globals.bug_on_assert);
ccdab3d6 BF	110	}
	111	XFS_SYSFS_ATTR_RW(bug_on_assert);
	112
2e227178 BF	113	STATIC ssize_t
2e227178 BF	114	log_recovery_delay_store(
a27c2640	115	struct kobject *kobject,
2e227178	116	const char *buf,
a27c2640	117	size_t count)
2e227178 BF	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
	134	STATIC ssize_t
	135	log_recovery_delay_show(
a27c2640 BD	136	struct kobject *kobject,
a27c2640 BD	137	char *buf)
2e227178	138	{
53eb47b4	139	return sysfs_emit(buf, "%d\n", xfs_globals.log_recovery_delay);
2e227178 BF	140	}
	141	XFS_SYSFS_ATTR_RW(log_recovery_delay);
	142
dae5cd81 DC	143	STATIC ssize_t
	144	mount_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
	164	STATIC ssize_t
	165	mount_delay_show(
	166	struct kobject *kobject,
	167	char *buf)
	168	{
53eb47b4	169	return sysfs_emit(buf, "%d\n", xfs_globals.mount_delay);
dae5cd81 DC	170	}
	171	XFS_SYSFS_ATTR_RW(mount_delay);
	172
66ae56a5 CH	173	static ssize_t
	174	always_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
	187	static ssize_t
	188	always_cow_show(
	189	struct kobject *kobject,
	190	char *buf)
	191	{
53eb47b4	192	return sysfs_emit(buf, "%d\n", xfs_globals.always_cow);
66ae56a5 CH	193	}
	194	XFS_SYSFS_ATTR_RW(always_cow);
	195
40786717 DW	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	*/
	202	STATIC ssize_t
	203	pwork_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
	223	STATIC ssize_t
	224	pwork_threads_show(
	225	struct kobject *kobject,
	226	char *buf)
	227	{
53eb47b4	228	return sysfs_emit(buf, "%d\n", xfs_globals.pwork_threads);
40786717 DW	229	}
40786717 DW	230	XFS_SYSFS_ATTR_RW(pwork_threads);
535e2f75 AH	231
	232	static ssize_t
	233	larp_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
	246	STATIC ssize_t
	247	larp_show(
	248	struct kobject *kobject,
	249	char *buf)
	250	{
	251	return snprintf(buf, PAGE_SIZE, "%d\n", xfs_globals.larp);
	252	}
	253	XFS_SYSFS_ATTR_RW(larp);
40786717 DW	254	#endif /* DEBUG */
40786717 DW	255
65b65735	256	static struct attribute *xfs_dbg_attrs[] = {
ccdab3d6	257	ATTR_LIST(bug_on_assert),
2e227178	258	ATTR_LIST(log_recovery_delay),
dae5cd81	259	ATTR_LIST(mount_delay),
66ae56a5	260	ATTR_LIST(always_cow),
40786717 DW	261	#ifdef DEBUG
40786717 DW	262	ATTR_LIST(pwork_threads),
535e2f75	263	ATTR_LIST(larp),
40786717	264	#endif
65b65735 BF	265	NULL,
65b65735 BF	266	};
219aac5d	267	ATTRIBUTE_GROUPS(xfs_dbg);
65b65735	268
2ee83335	269	const struct kobj_type xfs_dbg_ktype = {
65b65735	270	.release = xfs_sysfs_release,
a27c2640	271	.sysfs_ops = &xfs_sysfs_ops,
219aac5d	272	.default_groups = xfs_dbg_groups,
65b65735 BF	273	};
	274
	275	#endif /* DEBUG */
	276
bb230c12 BD	277	/* stats */
bb230c12 BD	278
80529c45 BD	279	static inline struct xstats *
	280	to_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
bb230c12 BD	287	STATIC ssize_t
bb230c12 BD	288	stats_show(
a27c2640 BD	289	struct kobject *kobject,
a27c2640 BD	290	char *buf)
bb230c12	291	{
80529c45 BD	292	struct xstats *stats = to_xstats(kobject);
	293
	294	return xfs_stats_format(stats->xs_stats, buf);
bb230c12 BD	295	}
	296	XFS_SYSFS_ATTR_RO(stats);
	297
	298	STATIC ssize_t
	299	stats_clear_store(
a27c2640	300	struct kobject *kobject,
bb230c12	301	const char *buf,
a27c2640	302	size_t count)
bb230c12 BD	303	{
	304	int ret;
	305	int val;
80529c45	306	struct xstats *stats = to_xstats(kobject);
bb230c12 BD	307
	308	ret = kstrtoint(buf, 0, &val);
	309	if (ret)
	310	return ret;
	311
	312	if (val != 1)
	313	return -EINVAL;
80529c45 BD	314
80529c45 BD	315	xfs_stats_clearall(stats->xs_stats);
bb230c12 BD	316	return count;
	317	}
	318	XFS_SYSFS_ATTR_WO(stats_clear);
	319
	320	static struct attribute *xfs_stats_attrs[] = {
	321	ATTR_LIST(stats),
	322	ATTR_LIST(stats_clear),
	323	NULL,
	324	};
219aac5d	325	ATTRIBUTE_GROUPS(xfs_stats);
bb230c12	326
2ee83335	327	const struct kobj_type xfs_stats_ktype = {
bb230c12	328	.release = xfs_sysfs_release,
a27c2640	329	.sysfs_ops = &xfs_sysfs_ops,
219aac5d	330	.default_groups = xfs_stats_groups,
bb230c12 BD	331	};
bb230c12 BD	332
baff4e44 BF	333	/* xlog */
baff4e44 BF	334
a27c2640 BD	335	static inline struct xlog *
	336	to_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
80d6d698 BF	343	STATIC ssize_t
80d6d698 BF	344	log_head_lsn_show(
a27c2640 BD	345	struct kobject *kobject,
a27c2640 BD	346	char *buf)
80d6d698	347	{
80d6d698 BF	348	int cycle;
80d6d698 BF	349	int block;
a27c2640	350	struct xlog *log = to_xlog(kobject);
80d6d698 BF	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
53eb47b4	357	return sysfs_emit(buf, "%d:%d\n", cycle, block);
80d6d698 BF	358	}
	359	XFS_SYSFS_ATTR_RO(log_head_lsn);
	360
	361	STATIC ssize_t
	362	log_tail_lsn_show(
a27c2640 BD	363	struct kobject *kobject,
a27c2640 BD	364	char *buf)
80d6d698	365	{
80d6d698 BF	366	int cycle;
80d6d698 BF	367	int block;
a27c2640	368	struct xlog *log = to_xlog(kobject);
80d6d698 BF	369
80d6d698 BF	370	xlog_crack_atomic_lsn(&log->l_tail_lsn, &cycle, &block);
53eb47b4	371	return sysfs_emit(buf, "%d:%d\n", cycle, block);
80d6d698 BF	372	}
	373	XFS_SYSFS_ATTR_RO(log_tail_lsn);
	374
	375	STATIC ssize_t
	376	reserve_grant_head_show(
a27c2640 BD	377	struct kobject *kobject,
	378	char *buf)
	379
80d6d698	380	{
80d6d698 BF	381	int cycle;
80d6d698 BF	382	int bytes;
a27c2640	383	struct xlog *log = to_xlog(kobject);
80d6d698 BF	384
80d6d698 BF	385	xlog_crack_grant_head(&log->l_reserve_head.grant, &cycle, &bytes);
53eb47b4	386	return sysfs_emit(buf, "%d:%d\n", cycle, bytes);
80d6d698 BF	387	}
	388	XFS_SYSFS_ATTR_RO(reserve_grant_head);
	389
	390	STATIC ssize_t
	391	write_grant_head_show(
a27c2640 BD	392	struct kobject *kobject,
a27c2640 BD	393	char *buf)
80d6d698	394	{
80d6d698 BF	395	int cycle;
80d6d698 BF	396	int bytes;
a27c2640	397	struct xlog *log = to_xlog(kobject);
80d6d698 BF	398
80d6d698 BF	399	xlog_crack_grant_head(&log->l_write_head.grant, &cycle, &bytes);
53eb47b4	400	return sysfs_emit(buf, "%d:%d\n", cycle, bytes);
80d6d698 BF	401	}
	402	XFS_SYSFS_ATTR_RO(write_grant_head);
	403
baff4e44	404	static struct attribute *xfs_log_attrs[] = {
80d6d698 BF	405	ATTR_LIST(log_head_lsn),
	406	ATTR_LIST(log_tail_lsn),
	407	ATTR_LIST(reserve_grant_head),
	408	ATTR_LIST(write_grant_head),
baff4e44 BF	409	NULL,
baff4e44 BF	410	};
219aac5d	411	ATTRIBUTE_GROUPS(xfs_log);
baff4e44	412
2ee83335	413	const struct kobj_type xfs_log_ktype = {
baff4e44	414	.release = xfs_sysfs_release,
a27c2640	415	.sysfs_ops = &xfs_sysfs_ops,
219aac5d	416	.default_groups = xfs_log_groups,
baff4e44	417	};
192852be CM	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	*/
192852be CM	429	static inline struct xfs_error_cfg *
	430	to_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
e6b3bb78 CM	436	static inline struct xfs_mount *
	437	err_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
a5ea70d2 CM	443	static ssize_t
	444	max_retries_show(
	445	struct kobject *kobject,
	446	char *buf)
	447	{
77169812	448	int retries;
a5ea70d2 CM	449	struct xfs_error_cfg *cfg = to_error_cfg(kobject);
a5ea70d2 CM	450
ff97f239	451	if (cfg->max_retries == XFS_ERR_RETRY_FOREVER)
77169812 ES	452	retries = -1;
	453	else
	454	retries = cfg->max_retries;
	455
53eb47b4	456	return sysfs_emit(buf, "%d\n", retries);
a5ea70d2 CM	457	}
	458
	459	static ssize_t
	460	max_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
77169812	476	if (val == -1)
ff97f239	477	cfg->max_retries = XFS_ERR_RETRY_FOREVER;
77169812 ES	478	else
77169812 ES	479	cfg->max_retries = val;
a5ea70d2 CM	480	return count;
	481	}
	482	XFS_SYSFS_ATTR_RW(max_retries);
	483
	484	static ssize_t
	485	retry_timeout_seconds_show(
	486	struct kobject *kobject,
	487	char *buf)
	488	{
77169812	489	int timeout;
a5ea70d2 CM	490	struct xfs_error_cfg *cfg = to_error_cfg(kobject);
a5ea70d2 CM	491
77169812 ES	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
53eb47b4	497	return sysfs_emit(buf, "%d\n", timeout);
a5ea70d2 CM	498	}
	499
	500	static ssize_t
	501	retry_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
77169812 ES	514	/* 1 day timeout maximum, -1 means infinite */
77169812 ES	515	if (val < -1 \|\| val > 86400)
a5ea70d2 CM	516	return -EINVAL;
a5ea70d2 CM	517
77169812 ES	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	}
a5ea70d2 CM	524	return count;
	525	}
	526	XFS_SYSFS_ATTR_RW(retry_timeout_seconds);
	527
e6b3bb78 CM	528	static ssize_t
	529	fail_at_unmount_show(
	530	struct kobject *kobject,
	531	char *buf)
	532	{
	533	struct xfs_mount *mp = err_to_mp(kobject);
	534
53eb47b4	535	return sysfs_emit(buf, "%d\n", mp->m_fail_unmount);
e6b3bb78 CM	536	}
	537
	538	static ssize_t
	539	fail_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	}
	558	XFS_SYSFS_ATTR_RW(fail_at_unmount);
	559
a5ea70d2 CM	560	static struct attribute *xfs_error_attrs[] = {
	561	ATTR_LIST(max_retries),
	562	ATTR_LIST(retry_timeout_seconds),
	563	NULL,
	564	};
219aac5d	565	ATTRIBUTE_GROUPS(xfs_error);
a5ea70d2	566
2ee83335	567	static const struct kobj_type xfs_error_cfg_ktype = {
192852be CM	568	.release = xfs_sysfs_release,
192852be CM	569	.sysfs_ops = &xfs_sysfs_ops,
219aac5d	570	.default_groups = xfs_error_groups,
192852be CM	571	};
192852be CM	572
2ee83335	573	static const struct kobj_type xfs_error_ktype = {
192852be	574	.release = xfs_sysfs_release,
e6b3bb78	575	.sysfs_ops = &xfs_sysfs_ops,
192852be CM	576	};
192852be CM	577
ef6a50fb CM	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	*/
	584	struct xfs_error_init {
	585	char *name;
	586	int max_retries;
a5ea70d2	587	int retry_timeout; /* in seconds */
ef6a50fb CM	588	};
	589
	590	static const struct xfs_error_init xfs_error_meta_init[XFS_ERR_ERRNO_MAX] = {
	591	{ .name = "default",
e0a431b3	592	.max_retries = XFS_ERR_RETRY_FOREVER,
77169812	593	.retry_timeout = XFS_ERR_RETRY_FOREVER,
ef6a50fb	594	},
e0a431b3 CM	595	{ .name = "EIO",
e0a431b3 CM	596	.max_retries = XFS_ERR_RETRY_FOREVER,
77169812	597	.retry_timeout = XFS_ERR_RETRY_FOREVER,
e0a431b3 CM	598	},
	599	{ .name = "ENOSPC",
	600	.max_retries = XFS_ERR_RETRY_FOREVER,
77169812	601	.retry_timeout = XFS_ERR_RETRY_FOREVER,
e0a431b3 CM	602	},
e0a431b3 CM	603	{ .name = "ENODEV",
77169812 ES	604	.max_retries = 0, /* We can't recover from devices disappearing */
77169812 ES	605	.retry_timeout = 0,
e0a431b3	606	},
ef6a50fb CM	607	};
	608
	609	static int
	610	xfs_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;
77169812 ES	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(
a5ea70d2	640	init[i].retry_timeout * MSEC_PER_SEC);
ef6a50fb CM	641	}
	642	return 0;
	643
	644	out_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
192852be CM	654	int
	655	xfs_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");
ffd40ef6 CM	663	if (error)
	664	return error;
	665
e6b3bb78 CM	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
ffd40ef6	672	/* .../xfs/<dev>/error/metadata/ */
ef6a50fb CM	673	error = xfs_error_sysfs_init_class(mp, XFS_ERR_METADATA,
	674	"metadata", &mp->m_error_meta_kobj,
	675	xfs_error_meta_init);
ffd40ef6 CM	676	if (error)
	677	goto out_error;
	678
ffd40ef6 CM	679	return 0;
ffd40ef6 CM	680
ffd40ef6 CM	681	out_error:
ffd40ef6 CM	682	xfs_sysfs_del(&mp->m_error_kobj);
192852be CM	683	return error;
	684	}
	685
	686	void
	687	xfs_error_sysfs_del(
	688	struct xfs_mount *mp)
	689	{
ffd40ef6 CM	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);
192852be CM	701	xfs_sysfs_del(&mp->m_error_kobj);
192852be CM	702	}
df309390 CM	703
	704	struct xfs_error_cfg *
	705	xfs_error_get_cfg(
	706	struct xfs_mount *mp,
	707	int error_class,
	708	int error)
	709	{
	710	struct xfs_error_cfg *cfg;
	711
e97f6c54 ES	712	if (error < 0)
	713	error = -error;
	714
df309390	715	switch (error) {
e0a431b3 CM	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;
df309390 CM	725	default:
	726	cfg = &mp->m_error_cfg[error_class][XFS_ERR_DEFAULT];
	727	break;
	728	}
	729
	730	return cfg;
	731	}