[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);

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);
#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),
#endif
	NULL,
};
ATTRIBUTE_GROUPS(xfs_dbg);

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);

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);

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

static 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 BF	71
	72	struct kobj_type xfs_mp_ktype = {
	73	.release = xfs_sysfs_release,
	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	}
	230	XFS_SYSFS_ATTR_RW(pwork_threads);
	231	#endif /* DEBUG */
	232
65b65735	233	static struct attribute *xfs_dbg_attrs[] = {
ccdab3d6	234	ATTR_LIST(bug_on_assert),
2e227178	235	ATTR_LIST(log_recovery_delay),
dae5cd81	236	ATTR_LIST(mount_delay),
66ae56a5	237	ATTR_LIST(always_cow),
40786717 DW	238	#ifdef DEBUG
	239	ATTR_LIST(pwork_threads),
	240	#endif
65b65735 BF	241	NULL,
65b65735 BF	242	};
219aac5d	243	ATTRIBUTE_GROUPS(xfs_dbg);
65b65735	244
65b65735 BF	245	struct kobj_type xfs_dbg_ktype = {
65b65735 BF	246	.release = xfs_sysfs_release,
a27c2640	247	.sysfs_ops = &xfs_sysfs_ops,
219aac5d	248	.default_groups = xfs_dbg_groups,
65b65735 BF	249	};
	250
	251	#endif /* DEBUG */
	252
bb230c12 BD	253	/* stats */
bb230c12 BD	254
80529c45 BD	255	static inline struct xstats *
	256	to_xstats(struct kobject *kobject)
	257	{
	258	struct xfs_kobj *kobj = to_kobj(kobject);
	259
	260	return container_of(kobj, struct xstats, xs_kobj);
	261	}
	262
bb230c12 BD	263	STATIC ssize_t
bb230c12 BD	264	stats_show(
a27c2640 BD	265	struct kobject *kobject,
a27c2640 BD	266	char *buf)
bb230c12	267	{
80529c45 BD	268	struct xstats *stats = to_xstats(kobject);
	269
	270	return xfs_stats_format(stats->xs_stats, buf);
bb230c12 BD	271	}
	272	XFS_SYSFS_ATTR_RO(stats);
	273
	274	STATIC ssize_t
	275	stats_clear_store(
a27c2640	276	struct kobject *kobject,
bb230c12	277	const char *buf,
a27c2640	278	size_t count)
bb230c12 BD	279	{
	280	int ret;
	281	int val;
80529c45	282	struct xstats *stats = to_xstats(kobject);
bb230c12 BD	283
	284	ret = kstrtoint(buf, 0, &val);
	285	if (ret)
	286	return ret;
	287
	288	if (val != 1)
	289	return -EINVAL;
80529c45 BD	290
80529c45 BD	291	xfs_stats_clearall(stats->xs_stats);
bb230c12 BD	292	return count;
	293	}
	294	XFS_SYSFS_ATTR_WO(stats_clear);
	295
	296	static struct attribute *xfs_stats_attrs[] = {
	297	ATTR_LIST(stats),
	298	ATTR_LIST(stats_clear),
	299	NULL,
	300	};
219aac5d	301	ATTRIBUTE_GROUPS(xfs_stats);
bb230c12	302
bb230c12 BD	303	struct kobj_type xfs_stats_ktype = {
bb230c12 BD	304	.release = xfs_sysfs_release,
a27c2640	305	.sysfs_ops = &xfs_sysfs_ops,
219aac5d	306	.default_groups = xfs_stats_groups,
bb230c12 BD	307	};
bb230c12 BD	308
baff4e44 BF	309	/* xlog */
baff4e44 BF	310
a27c2640 BD	311	static inline struct xlog *
	312	to_xlog(struct kobject *kobject)
	313	{
	314	struct xfs_kobj *kobj = to_kobj(kobject);
	315
	316	return container_of(kobj, struct xlog, l_kobj);
	317	}
	318
80d6d698 BF	319	STATIC ssize_t
80d6d698 BF	320	log_head_lsn_show(
a27c2640 BD	321	struct kobject *kobject,
a27c2640 BD	322	char *buf)
80d6d698	323	{
80d6d698 BF	324	int cycle;
80d6d698 BF	325	int block;
a27c2640	326	struct xlog *log = to_xlog(kobject);
80d6d698 BF	327
	328	spin_lock(&log->l_icloglock);
	329	cycle = log->l_curr_cycle;
	330	block = log->l_curr_block;
	331	spin_unlock(&log->l_icloglock);
	332
53eb47b4	333	return sysfs_emit(buf, "%d:%d\n", cycle, block);
80d6d698 BF	334	}
	335	XFS_SYSFS_ATTR_RO(log_head_lsn);
	336
	337	STATIC ssize_t
	338	log_tail_lsn_show(
a27c2640 BD	339	struct kobject *kobject,
a27c2640 BD	340	char *buf)
80d6d698	341	{
80d6d698 BF	342	int cycle;
80d6d698 BF	343	int block;
a27c2640	344	struct xlog *log = to_xlog(kobject);
80d6d698 BF	345
80d6d698 BF	346	xlog_crack_atomic_lsn(&log->l_tail_lsn, &cycle, &block);
53eb47b4	347	return sysfs_emit(buf, "%d:%d\n", cycle, block);
80d6d698 BF	348	}
	349	XFS_SYSFS_ATTR_RO(log_tail_lsn);
	350
	351	STATIC ssize_t
	352	reserve_grant_head_show(
a27c2640 BD	353	struct kobject *kobject,
	354	char *buf)
	355
80d6d698	356	{
80d6d698 BF	357	int cycle;
80d6d698 BF	358	int bytes;
a27c2640	359	struct xlog *log = to_xlog(kobject);
80d6d698 BF	360
80d6d698 BF	361	xlog_crack_grant_head(&log->l_reserve_head.grant, &cycle, &bytes);
53eb47b4	362	return sysfs_emit(buf, "%d:%d\n", cycle, bytes);
80d6d698 BF	363	}
	364	XFS_SYSFS_ATTR_RO(reserve_grant_head);
	365
	366	STATIC ssize_t
	367	write_grant_head_show(
a27c2640 BD	368	struct kobject *kobject,
a27c2640 BD	369	char *buf)
80d6d698	370	{
80d6d698 BF	371	int cycle;
80d6d698 BF	372	int bytes;
a27c2640	373	struct xlog *log = to_xlog(kobject);
80d6d698 BF	374
80d6d698 BF	375	xlog_crack_grant_head(&log->l_write_head.grant, &cycle, &bytes);
53eb47b4	376	return sysfs_emit(buf, "%d:%d\n", cycle, bytes);
80d6d698 BF	377	}
	378	XFS_SYSFS_ATTR_RO(write_grant_head);
	379
baff4e44	380	static struct attribute *xfs_log_attrs[] = {
80d6d698 BF	381	ATTR_LIST(log_head_lsn),
	382	ATTR_LIST(log_tail_lsn),
	383	ATTR_LIST(reserve_grant_head),
	384	ATTR_LIST(write_grant_head),
baff4e44 BF	385	NULL,
baff4e44 BF	386	};
219aac5d	387	ATTRIBUTE_GROUPS(xfs_log);
baff4e44	388
baff4e44 BF	389	struct kobj_type xfs_log_ktype = {
baff4e44 BF	390	.release = xfs_sysfs_release,
a27c2640	391	.sysfs_ops = &xfs_sysfs_ops,
219aac5d	392	.default_groups = xfs_log_groups,
baff4e44	393	};
192852be CM	394
	395	/*
	396	* Metadata IO error configuration
	397	*
	398	* The sysfs structure here is:
	399	* ...xfs/<dev>/error/<class>/<errno>/<error_attrs>
	400	*
	401	* where <class> allows us to discriminate between data IO and metadata IO,
	402	* and any other future type of IO (e.g. special inode or directory error
	403	* handling) we care to support.
	404	*/
192852be CM	405	static inline struct xfs_error_cfg *
	406	to_error_cfg(struct kobject *kobject)
	407	{
	408	struct xfs_kobj *kobj = to_kobj(kobject);
	409	return container_of(kobj, struct xfs_error_cfg, kobj);
	410	}
	411
e6b3bb78 CM	412	static inline struct xfs_mount *
	413	err_to_mp(struct kobject *kobject)
	414	{
	415	struct xfs_kobj *kobj = to_kobj(kobject);
	416	return container_of(kobj, struct xfs_mount, m_error_kobj);
	417	}
	418
a5ea70d2 CM	419	static ssize_t
	420	max_retries_show(
	421	struct kobject *kobject,
	422	char *buf)
	423	{
77169812	424	int retries;
a5ea70d2 CM	425	struct xfs_error_cfg *cfg = to_error_cfg(kobject);
a5ea70d2 CM	426
ff97f239	427	if (cfg->max_retries == XFS_ERR_RETRY_FOREVER)
77169812 ES	428	retries = -1;
	429	else
	430	retries = cfg->max_retries;
	431
53eb47b4	432	return sysfs_emit(buf, "%d\n", retries);
a5ea70d2 CM	433	}
	434
	435	static ssize_t
	436	max_retries_store(
	437	struct kobject *kobject,
	438	const char *buf,
	439	size_t count)
	440	{
	441	struct xfs_error_cfg *cfg = to_error_cfg(kobject);
	442	int ret;
	443	int val;
	444
	445	ret = kstrtoint(buf, 0, &val);
	446	if (ret)
	447	return ret;
	448
	449	if (val < -1)
	450	return -EINVAL;
	451
77169812	452	if (val == -1)
ff97f239	453	cfg->max_retries = XFS_ERR_RETRY_FOREVER;
77169812 ES	454	else
77169812 ES	455	cfg->max_retries = val;
a5ea70d2 CM	456	return count;
	457	}
	458	XFS_SYSFS_ATTR_RW(max_retries);
	459
	460	static ssize_t
	461	retry_timeout_seconds_show(
	462	struct kobject *kobject,
	463	char *buf)
	464	{
77169812	465	int timeout;
a5ea70d2 CM	466	struct xfs_error_cfg *cfg = to_error_cfg(kobject);
a5ea70d2 CM	467
77169812 ES	468	if (cfg->retry_timeout == XFS_ERR_RETRY_FOREVER)
	469	timeout = -1;
	470	else
	471	timeout = jiffies_to_msecs(cfg->retry_timeout) / MSEC_PER_SEC;
	472
53eb47b4	473	return sysfs_emit(buf, "%d\n", timeout);
a5ea70d2 CM	474	}
	475
	476	static ssize_t
	477	retry_timeout_seconds_store(
	478	struct kobject *kobject,
	479	const char *buf,
	480	size_t count)
	481	{
	482	struct xfs_error_cfg *cfg = to_error_cfg(kobject);
	483	int ret;
	484	int val;
	485
	486	ret = kstrtoint(buf, 0, &val);
	487	if (ret)
	488	return ret;
	489
77169812 ES	490	/* 1 day timeout maximum, -1 means infinite */
77169812 ES	491	if (val < -1 \|\| val > 86400)
a5ea70d2 CM	492	return -EINVAL;
a5ea70d2 CM	493
77169812 ES	494	if (val == -1)
	495	cfg->retry_timeout = XFS_ERR_RETRY_FOREVER;
	496	else {
	497	cfg->retry_timeout = msecs_to_jiffies(val * MSEC_PER_SEC);
	498	ASSERT(msecs_to_jiffies(val * MSEC_PER_SEC) < LONG_MAX);
	499	}
a5ea70d2 CM	500	return count;
	501	}
	502	XFS_SYSFS_ATTR_RW(retry_timeout_seconds);
	503
e6b3bb78 CM	504	static ssize_t
	505	fail_at_unmount_show(
	506	struct kobject *kobject,
	507	char *buf)
	508	{
	509	struct xfs_mount *mp = err_to_mp(kobject);
	510
53eb47b4	511	return sysfs_emit(buf, "%d\n", mp->m_fail_unmount);
e6b3bb78 CM	512	}
	513
	514	static ssize_t
	515	fail_at_unmount_store(
	516	struct kobject *kobject,
	517	const char *buf,
	518	size_t count)
	519	{
	520	struct xfs_mount *mp = err_to_mp(kobject);
	521	int ret;
	522	int val;
	523
	524	ret = kstrtoint(buf, 0, &val);
	525	if (ret)
	526	return ret;
	527
	528	if (val < 0 \|\| val > 1)
	529	return -EINVAL;
	530
	531	mp->m_fail_unmount = val;
	532	return count;
	533	}
	534	XFS_SYSFS_ATTR_RW(fail_at_unmount);
	535
a5ea70d2 CM	536	static struct attribute *xfs_error_attrs[] = {
	537	ATTR_LIST(max_retries),
	538	ATTR_LIST(retry_timeout_seconds),
	539	NULL,
	540	};
219aac5d	541	ATTRIBUTE_GROUPS(xfs_error);
a5ea70d2	542
f1b8243c	543	static struct kobj_type xfs_error_cfg_ktype = {
192852be CM	544	.release = xfs_sysfs_release,
192852be CM	545	.sysfs_ops = &xfs_sysfs_ops,
219aac5d	546	.default_groups = xfs_error_groups,
192852be CM	547	};
192852be CM	548
f1b8243c	549	static struct kobj_type xfs_error_ktype = {
192852be	550	.release = xfs_sysfs_release,
e6b3bb78	551	.sysfs_ops = &xfs_sysfs_ops,
192852be CM	552	};
192852be CM	553
ef6a50fb CM	554	/*
	555	* Error initialization tables. These need to be ordered in the same
	556	* order as the enums used to index the array. All class init tables need to
	557	* define a "default" behaviour as the first entry, all other entries can be
	558	* empty.
	559	*/
	560	struct xfs_error_init {
	561	char *name;
	562	int max_retries;
a5ea70d2	563	int retry_timeout; /* in seconds */
ef6a50fb CM	564	};
	565
	566	static const struct xfs_error_init xfs_error_meta_init[XFS_ERR_ERRNO_MAX] = {
	567	{ .name = "default",
e0a431b3	568	.max_retries = XFS_ERR_RETRY_FOREVER,
77169812	569	.retry_timeout = XFS_ERR_RETRY_FOREVER,
ef6a50fb	570	},
e0a431b3 CM	571	{ .name = "EIO",
e0a431b3 CM	572	.max_retries = XFS_ERR_RETRY_FOREVER,
77169812	573	.retry_timeout = XFS_ERR_RETRY_FOREVER,
e0a431b3 CM	574	},
	575	{ .name = "ENOSPC",
	576	.max_retries = XFS_ERR_RETRY_FOREVER,
77169812	577	.retry_timeout = XFS_ERR_RETRY_FOREVER,
e0a431b3 CM	578	},
e0a431b3 CM	579	{ .name = "ENODEV",
77169812 ES	580	.max_retries = 0, /* We can't recover from devices disappearing */
77169812 ES	581	.retry_timeout = 0,
e0a431b3	582	},
ef6a50fb CM	583	};
	584
	585	static int
	586	xfs_error_sysfs_init_class(
	587	struct xfs_mount *mp,
	588	int class,
	589	const char *parent_name,
	590	struct xfs_kobj *parent_kobj,
	591	const struct xfs_error_init init[])
	592	{
	593	struct xfs_error_cfg *cfg;
	594	int error;
	595	int i;
	596
	597	ASSERT(class < XFS_ERR_CLASS_MAX);
	598
	599	error = xfs_sysfs_init(parent_kobj, &xfs_error_ktype,
	600	&mp->m_error_kobj, parent_name);
	601	if (error)
	602	return error;
	603
	604	for (i = 0; i < XFS_ERR_ERRNO_MAX; i++) {
	605	cfg = &mp->m_error_cfg[class][i];
	606	error = xfs_sysfs_init(&cfg->kobj, &xfs_error_cfg_ktype,
	607	parent_kobj, init[i].name);
	608	if (error)
	609	goto out_error;
	610
	611	cfg->max_retries = init[i].max_retries;
77169812 ES	612	if (init[i].retry_timeout == XFS_ERR_RETRY_FOREVER)
	613	cfg->retry_timeout = XFS_ERR_RETRY_FOREVER;
	614	else
	615	cfg->retry_timeout = msecs_to_jiffies(
a5ea70d2	616	init[i].retry_timeout * MSEC_PER_SEC);
ef6a50fb CM	617	}
	618	return 0;
	619
	620	out_error:
	621	/* unwind the entries that succeeded */
	622	for (i--; i >= 0; i--) {
	623	cfg = &mp->m_error_cfg[class][i];
	624	xfs_sysfs_del(&cfg->kobj);
	625	}
	626	xfs_sysfs_del(parent_kobj);
	627	return error;
	628	}
	629
192852be CM	630	int
	631	xfs_error_sysfs_init(
	632	struct xfs_mount *mp)
	633	{
	634	int error;
	635
	636	/* .../xfs/<dev>/error/ */
	637	error = xfs_sysfs_init(&mp->m_error_kobj, &xfs_error_ktype,
	638	&mp->m_kobj, "error");
ffd40ef6 CM	639	if (error)
	640	return error;
	641
e6b3bb78 CM	642	error = sysfs_create_file(&mp->m_error_kobj.kobject,
	643	ATTR_LIST(fail_at_unmount));
	644
	645	if (error)
	646	goto out_error;
	647
ffd40ef6	648	/* .../xfs/<dev>/error/metadata/ */
ef6a50fb CM	649	error = xfs_error_sysfs_init_class(mp, XFS_ERR_METADATA,
	650	"metadata", &mp->m_error_meta_kobj,
	651	xfs_error_meta_init);
ffd40ef6 CM	652	if (error)
	653	goto out_error;
	654
ffd40ef6 CM	655	return 0;
ffd40ef6 CM	656
ffd40ef6 CM	657	out_error:
ffd40ef6 CM	658	xfs_sysfs_del(&mp->m_error_kobj);
192852be CM	659	return error;
	660	}
	661
	662	void
	663	xfs_error_sysfs_del(
	664	struct xfs_mount *mp)
	665	{
ffd40ef6 CM	666	struct xfs_error_cfg *cfg;
	667	int i, j;
	668
	669	for (i = 0; i < XFS_ERR_CLASS_MAX; i++) {
	670	for (j = 0; j < XFS_ERR_ERRNO_MAX; j++) {
	671	cfg = &mp->m_error_cfg[i][j];
	672
	673	xfs_sysfs_del(&cfg->kobj);
	674	}
	675	}
	676	xfs_sysfs_del(&mp->m_error_meta_kobj);
192852be CM	677	xfs_sysfs_del(&mp->m_error_kobj);
192852be CM	678	}
df309390 CM	679
	680	struct xfs_error_cfg *
	681	xfs_error_get_cfg(
	682	struct xfs_mount *mp,
	683	int error_class,
	684	int error)
	685	{
	686	struct xfs_error_cfg *cfg;
	687
e97f6c54 ES	688	if (error < 0)
	689	error = -error;
	690
df309390	691	switch (error) {
e0a431b3 CM	692	case EIO:
	693	cfg = &mp->m_error_cfg[error_class][XFS_ERR_EIO];
	694	break;
	695	case ENOSPC:
	696	cfg = &mp->m_error_cfg[error_class][XFS_ERR_ENOSPC];
	697	break;
	698	case ENODEV:
	699	cfg = &mp->m_error_cfg[error_class][XFS_ERR_ENODEV];
	700	break;
df309390 CM	701	default:
	702	cfg = &mp->m_error_cfg[error_class][XFS_ERR_DEFAULT];
	703	break;
	704	}
	705
	706	return cfg;
	707	}