[linux-2.6-block.git] / fs / xfs / xfs_sysfs.c

/*
 * Copyright (c) 2014 Red Hat, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#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_stats.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,
};

/*
 * xfs_mount kobject. The mp kobject also serves as the per-mount parent object
 * that is identified by the fsname under sysfs.
 */

static inline struct xfs_mount *
to_mp(struct kobject *kobject)
{
	struct xfs_kobj *kobj = to_kobj(kobject);

	return container_of(kobj, struct xfs_mount, m_kobj);
}

#ifdef DEBUG

STATIC ssize_t
fail_writes_store(
	struct kobject		*kobject,
	const char		*buf,
	size_t			count)
{
	struct xfs_mount	*mp = to_mp(kobject);
	int			ret;
	int			val;

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

	if (val == 1)
		mp->m_fail_writes = true;
	else if (val == 0)
		mp->m_fail_writes = false;
	else
		return -EINVAL;

	return count;
}

STATIC ssize_t
fail_writes_show(
	struct kobject		*kobject,
	char			*buf)
{
	struct xfs_mount	*mp = to_mp(kobject);

	return snprintf(buf, PAGE_SIZE, "%d\n", mp->m_fail_writes ? 1 : 0);
}
XFS_SYSFS_ATTR_RW(fail_writes);

#endif /* DEBUG */

static struct attribute *xfs_mp_attrs[] = {
#ifdef DEBUG
	ATTR_LIST(fail_writes),
#endif
	NULL,
};

struct kobj_type xfs_mp_ktype = {
	.release = xfs_sysfs_release,
	.sysfs_ops = &xfs_sysfs_ops,
	.default_attrs = xfs_mp_attrs,
};

#ifdef DEBUG
/* debug */

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 snprintf(buf, PAGE_SIZE, "%d\n", xfs_globals.log_recovery_delay);
}
XFS_SYSFS_ATTR_RW(log_recovery_delay);

static struct attribute *xfs_dbg_attrs[] = {
	ATTR_LIST(log_recovery_delay),
	NULL,
};

struct kobj_type xfs_dbg_ktype = {
	.release = xfs_sysfs_release,
	.sysfs_ops = &xfs_sysfs_ops,
	.default_attrs = xfs_dbg_attrs,
};

#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,
};

struct kobj_type xfs_stats_ktype = {
	.release = xfs_sysfs_release,
	.sysfs_ops = &xfs_sysfs_ops,
	.default_attrs = xfs_stats_attrs,
};

/* 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 snprintf(buf, PAGE_SIZE, "%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 snprintf(buf, PAGE_SIZE, "%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 snprintf(buf, PAGE_SIZE, "%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 snprintf(buf, PAGE_SIZE, "%d:%d\n", cycle, bytes);
}
XFS_SYSFS_ATTR_RO(write_grant_head);

#ifdef DEBUG
STATIC ssize_t
log_badcrc_factor_store(
	struct kobject	*kobject,
	const char	*buf,
	size_t		count)
{
	struct xlog	*log = to_xlog(kobject);
	int		ret;
	uint32_t	val;

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

	log->l_badcrc_factor = val;

	return count;
}

STATIC ssize_t
log_badcrc_factor_show(
	struct kobject	*kobject,
	char		*buf)
{
	struct xlog	*log = to_xlog(kobject);

	return snprintf(buf, PAGE_SIZE, "%d\n", log->l_badcrc_factor);
}

XFS_SYSFS_ATTR_RW(log_badcrc_factor);
#endif	/* DEBUG */

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),
#ifdef DEBUG
	ATTR_LIST(log_badcrc_factor),
#endif
	NULL,
};

struct kobj_type xfs_log_ktype = {
	.release = xfs_sysfs_release,
	.sysfs_ops = &xfs_sysfs_ops,
	.default_attrs = xfs_log_attrs,
};

/*
 * 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->retry_timeout == XFS_ERR_RETRY_FOREVER)
		retries = -1;
	else
		retries = cfg->max_retries;

	return snprintf(buf, PAGE_SIZE, "%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->retry_timeout = 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 snprintf(buf, PAGE_SIZE, "%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 snprintf(buf, PAGE_SIZE, "%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,
};


struct kobj_type xfs_error_cfg_ktype = {
	.release = xfs_sysfs_release,
	.sysfs_ops = &xfs_sysfs_ops,
	.default_attrs = xfs_error_attrs,
};

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
a31b1d3d BF	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"
192852be	20	#include "xfs_shared.h"
801cc4e1	21	#include "xfs_format.h"
baff4e44	22	#include "xfs_log_format.h"
801cc4e1	23	#include "xfs_trans_resv.h"
192852be	24	#include "xfs_sysfs.h"
baff4e44 BF	25	#include "xfs_log.h"
baff4e44 BF	26	#include "xfs_log_priv.h"
bb230c12	27	#include "xfs_stats.h"
801cc4e1	28	#include "xfs_mount.h"
a31b1d3d BF	29
	30	struct xfs_sysfs_attr {
	31	struct attribute attr;
a27c2640 BD	32	ssize_t (show)(struct kobject kobject, char *buf);
	33	ssize_t (store)(struct kobject kobject, const char *buf,
	34	size_t count);
a31b1d3d BF	35	};
	36
	37	static inline struct xfs_sysfs_attr *
	38	to_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)
bb230c12 BD	47	#define XFS_SYSFS_ATTR_WO(name) \
bb230c12 BD	48	static struct xfs_sysfs_attr xfs_sysfs_attr_##name = __ATTR_WO(name)
a31b1d3d BF	49
	50	#define ATTR_LIST(name) &xfs_sysfs_attr_##name.attr
	51
a27c2640 BD	52	STATIC ssize_t
	53	xfs_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
	63	STATIC ssize_t
	64	xfs_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
	75	static const struct sysfs_ops xfs_sysfs_ops = {
	76	.show = xfs_sysfs_object_show,
	77	.store = xfs_sysfs_object_store,
	78	};
	79
801cc4e1 BF	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
	85	static inline struct xfs_mount *
	86	to_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
	93	#ifdef DEBUG
	94
	95	STATIC ssize_t
	96	fail_writes_store(
	97	struct kobject *kobject,
	98	const char *buf,
	99	size_t count)
	100	{
	101	struct xfs_mount *mp = to_mp(kobject);
	102	int ret;
	103	int val;
	104
	105	ret = kstrtoint(buf, 0, &val);
	106	if (ret)
	107	return ret;
	108
	109	if (val == 1)
	110	mp->m_fail_writes = true;
	111	else if (val == 0)
	112	mp->m_fail_writes = false;
	113	else
	114	return -EINVAL;
	115
	116	return count;
	117	}
	118
	119	STATIC ssize_t
	120	fail_writes_show(
	121	struct kobject *kobject,
	122	char *buf)
	123	{
	124	struct xfs_mount *mp = to_mp(kobject);
	125
	126	return snprintf(buf, PAGE_SIZE, "%d\n", mp->m_fail_writes ? 1 : 0);
	127	}
	128	XFS_SYSFS_ATTR_RW(fail_writes);
	129
	130	#endif /* DEBUG */
	131
	132	static struct attribute *xfs_mp_attrs[] = {
	133	#ifdef DEBUG
	134	ATTR_LIST(fail_writes),
	135	#endif
	136	NULL,
	137	};
	138
	139	struct kobj_type xfs_mp_ktype = {
	140	.release = xfs_sysfs_release,
	141	.sysfs_ops = &xfs_sysfs_ops,
	142	.default_attrs = xfs_mp_attrs,
	143	};
144
65b65735 BF	145	#ifdef DEBUG
	146	/* debug */
	147
2e227178 BF	148	STATIC ssize_t
2e227178 BF	149	log_recovery_delay_store(
a27c2640	150	struct kobject *kobject,
2e227178	151	const char *buf,
a27c2640	152	size_t count)
2e227178 BF	153	{
	154	int ret;
	155	int val;
	156
	157	ret = kstrtoint(buf, 0, &val);
	158	if (ret)
	159	return ret;
	160
	161	if (val < 0 \|\| val > 60)
	162	return -EINVAL;
	163
	164	xfs_globals.log_recovery_delay = val;
	165
	166	return count;
	167	}
	168
	169	STATIC ssize_t
	170	log_recovery_delay_show(
a27c2640 BD	171	struct kobject *kobject,
a27c2640 BD	172	char *buf)
2e227178 BF	173	{
	174	return snprintf(buf, PAGE_SIZE, "%d\n", xfs_globals.log_recovery_delay);
	175	}
	176	XFS_SYSFS_ATTR_RW(log_recovery_delay);
	177
65b65735	178	static struct attribute *xfs_dbg_attrs[] = {
2e227178	179	ATTR_LIST(log_recovery_delay),
65b65735 BF	180	NULL,
	181	};
	182
65b65735 BF	183	struct kobj_type xfs_dbg_ktype = {
65b65735 BF	184	.release = xfs_sysfs_release,
a27c2640	185	.sysfs_ops = &xfs_sysfs_ops,
65b65735 BF	186	.default_attrs = xfs_dbg_attrs,
	187	};
	188
	189	#endif /* DEBUG */
	190
bb230c12 BD	191	/* stats */
bb230c12 BD	192
80529c45 BD	193	static inline struct xstats *
	194	to_xstats(struct kobject *kobject)
	195	{
	196	struct xfs_kobj *kobj = to_kobj(kobject);
	197
	198	return container_of(kobj, struct xstats, xs_kobj);
	199	}
	200
bb230c12 BD	201	STATIC ssize_t
bb230c12 BD	202	stats_show(
a27c2640 BD	203	struct kobject *kobject,
a27c2640 BD	204	char *buf)
bb230c12	205	{
80529c45 BD	206	struct xstats *stats = to_xstats(kobject);
	207
	208	return xfs_stats_format(stats->xs_stats, buf);
bb230c12 BD	209	}
	210	XFS_SYSFS_ATTR_RO(stats);
	211
	212	STATIC ssize_t
	213	stats_clear_store(
a27c2640	214	struct kobject *kobject,
bb230c12	215	const char *buf,
a27c2640	216	size_t count)
bb230c12 BD	217	{
	218	int ret;
	219	int val;
80529c45	220	struct xstats *stats = to_xstats(kobject);
bb230c12 BD	221
	222	ret = kstrtoint(buf, 0, &val);
	223	if (ret)
	224	return ret;
	225
	226	if (val != 1)
	227	return -EINVAL;
80529c45 BD	228
80529c45 BD	229	xfs_stats_clearall(stats->xs_stats);
bb230c12 BD	230	return count;
	231	}
	232	XFS_SYSFS_ATTR_WO(stats_clear);
	233
	234	static struct attribute *xfs_stats_attrs[] = {
	235	ATTR_LIST(stats),
	236	ATTR_LIST(stats_clear),
	237	NULL,
	238	};
	239
bb230c12 BD	240	struct kobj_type xfs_stats_ktype = {
bb230c12 BD	241	.release = xfs_sysfs_release,
a27c2640	242	.sysfs_ops = &xfs_sysfs_ops,
bb230c12 BD	243	.default_attrs = xfs_stats_attrs,
	244	};
	245
baff4e44 BF	246	/* xlog */
baff4e44 BF	247
a27c2640 BD	248	static inline struct xlog *
	249	to_xlog(struct kobject *kobject)
	250	{
	251	struct xfs_kobj *kobj = to_kobj(kobject);
	252
	253	return container_of(kobj, struct xlog, l_kobj);
	254	}
	255
80d6d698 BF	256	STATIC ssize_t
80d6d698 BF	257	log_head_lsn_show(
a27c2640 BD	258	struct kobject *kobject,
a27c2640 BD	259	char *buf)
80d6d698	260	{
80d6d698 BF	261	int cycle;
80d6d698 BF	262	int block;
a27c2640	263	struct xlog *log = to_xlog(kobject);
80d6d698 BF	264
	265	spin_lock(&log->l_icloglock);
	266	cycle = log->l_curr_cycle;
	267	block = log->l_curr_block;
	268	spin_unlock(&log->l_icloglock);
	269
	270	return snprintf(buf, PAGE_SIZE, "%d:%d\n", cycle, block);
	271	}
	272	XFS_SYSFS_ATTR_RO(log_head_lsn);
	273
	274	STATIC ssize_t
	275	log_tail_lsn_show(
a27c2640 BD	276	struct kobject *kobject,
a27c2640 BD	277	char *buf)
80d6d698	278	{
80d6d698 BF	279	int cycle;
80d6d698 BF	280	int block;
a27c2640	281	struct xlog *log = to_xlog(kobject);
80d6d698 BF	282
	283	xlog_crack_atomic_lsn(&log->l_tail_lsn, &cycle, &block);
	284	return snprintf(buf, PAGE_SIZE, "%d:%d\n", cycle, block);
	285	}
	286	XFS_SYSFS_ATTR_RO(log_tail_lsn);
	287
	288	STATIC ssize_t
	289	reserve_grant_head_show(
a27c2640 BD	290	struct kobject *kobject,
	291	char *buf)
	292
80d6d698	293	{
80d6d698 BF	294	int cycle;
80d6d698 BF	295	int bytes;
a27c2640	296	struct xlog *log = to_xlog(kobject);
80d6d698 BF	297
	298	xlog_crack_grant_head(&log->l_reserve_head.grant, &cycle, &bytes);
	299	return snprintf(buf, PAGE_SIZE, "%d:%d\n", cycle, bytes);
	300	}
	301	XFS_SYSFS_ATTR_RO(reserve_grant_head);
	302
	303	STATIC ssize_t
	304	write_grant_head_show(
a27c2640 BD	305	struct kobject *kobject,
a27c2640 BD	306	char *buf)
80d6d698	307	{
80d6d698 BF	308	int cycle;
80d6d698 BF	309	int bytes;
a27c2640	310	struct xlog *log = to_xlog(kobject);
80d6d698 BF	311
	312	xlog_crack_grant_head(&log->l_write_head.grant, &cycle, &bytes);
	313	return snprintf(buf, PAGE_SIZE, "%d:%d\n", cycle, bytes);
	314	}
	315	XFS_SYSFS_ATTR_RO(write_grant_head);
	316
609adfc2 BF	317	#ifdef DEBUG
	318	STATIC ssize_t
	319	log_badcrc_factor_store(
	320	struct kobject *kobject,
	321	const char *buf,
	322	size_t count)
	323	{
	324	struct xlog *log = to_xlog(kobject);
	325	int ret;
	326	uint32_t val;
	327
	328	ret = kstrtouint(buf, 0, &val);
	329	if (ret)
	330	return ret;
	331
	332	log->l_badcrc_factor = val;
	333
	334	return count;
	335	}
	336
	337	STATIC ssize_t
	338	log_badcrc_factor_show(
	339	struct kobject *kobject,
	340	char *buf)
	341	{
	342	struct xlog *log = to_xlog(kobject);
	343
	344	return snprintf(buf, PAGE_SIZE, "%d\n", log->l_badcrc_factor);
	345	}
	346
	347	XFS_SYSFS_ATTR_RW(log_badcrc_factor);
	348	#endif /* DEBUG */
	349
baff4e44	350	static struct attribute *xfs_log_attrs[] = {
80d6d698 BF	351	ATTR_LIST(log_head_lsn),
	352	ATTR_LIST(log_tail_lsn),
	353	ATTR_LIST(reserve_grant_head),
	354	ATTR_LIST(write_grant_head),
609adfc2 BF	355	#ifdef DEBUG
	356	ATTR_LIST(log_badcrc_factor),
	357	#endif
baff4e44 BF	358	NULL,
	359	};
	360
baff4e44 BF	361	struct kobj_type xfs_log_ktype = {
baff4e44 BF	362	.release = xfs_sysfs_release,
a27c2640	363	.sysfs_ops = &xfs_sysfs_ops,
baff4e44 BF	364	.default_attrs = xfs_log_attrs,
baff4e44 BF	365	};
192852be CM	366
	367	/*
	368	* Metadata IO error configuration
	369	*
	370	* The sysfs structure here is:
	371	* ...xfs/<dev>/error/<class>/<errno>/<error_attrs>
	372	*
	373	* where <class> allows us to discriminate between data IO and metadata IO,
	374	* and any other future type of IO (e.g. special inode or directory error
	375	* handling) we care to support.
	376	*/
192852be CM	377	static inline struct xfs_error_cfg *
	378	to_error_cfg(struct kobject *kobject)
	379	{
	380	struct xfs_kobj *kobj = to_kobj(kobject);
	381	return container_of(kobj, struct xfs_error_cfg, kobj);
	382	}
	383
e6b3bb78 CM	384	static inline struct xfs_mount *
	385	err_to_mp(struct kobject *kobject)
	386	{
	387	struct xfs_kobj *kobj = to_kobj(kobject);
	388	return container_of(kobj, struct xfs_mount, m_error_kobj);
	389	}
	390
a5ea70d2 CM	391	static ssize_t
	392	max_retries_show(
	393	struct kobject *kobject,
	394	char *buf)
	395	{
77169812	396	int retries;
a5ea70d2 CM	397	struct xfs_error_cfg *cfg = to_error_cfg(kobject);
a5ea70d2 CM	398
77169812 ES	399	if (cfg->retry_timeout == XFS_ERR_RETRY_FOREVER)
	400	retries = -1;
	401	else
	402	retries = cfg->max_retries;
	403
	404	return snprintf(buf, PAGE_SIZE, "%d\n", retries);
a5ea70d2 CM	405	}
	406
	407	static ssize_t
	408	max_retries_store(
	409	struct kobject *kobject,
	410	const char *buf,
	411	size_t count)
	412	{
	413	struct xfs_error_cfg *cfg = to_error_cfg(kobject);
	414	int ret;
	415	int val;
	416
	417	ret = kstrtoint(buf, 0, &val);
	418	if (ret)
	419	return ret;
	420
	421	if (val < -1)
	422	return -EINVAL;
	423
77169812 ES	424	if (val == -1)
	425	cfg->retry_timeout = XFS_ERR_RETRY_FOREVER;
	426	else
	427	cfg->max_retries = val;
a5ea70d2 CM	428	return count;
	429	}
	430	XFS_SYSFS_ATTR_RW(max_retries);
	431
	432	static ssize_t
	433	retry_timeout_seconds_show(
	434	struct kobject *kobject,
	435	char *buf)
	436	{
77169812	437	int timeout;
a5ea70d2 CM	438	struct xfs_error_cfg *cfg = to_error_cfg(kobject);
a5ea70d2 CM	439
77169812 ES	440	if (cfg->retry_timeout == XFS_ERR_RETRY_FOREVER)
	441	timeout = -1;
	442	else
	443	timeout = jiffies_to_msecs(cfg->retry_timeout) / MSEC_PER_SEC;
	444
	445	return snprintf(buf, PAGE_SIZE, "%d\n", timeout);
a5ea70d2 CM	446	}
	447
	448	static ssize_t
	449	retry_timeout_seconds_store(
	450	struct kobject *kobject,
	451	const char *buf,
	452	size_t count)
	453	{
	454	struct xfs_error_cfg *cfg = to_error_cfg(kobject);
	455	int ret;
	456	int val;
	457
	458	ret = kstrtoint(buf, 0, &val);
	459	if (ret)
	460	return ret;
	461
77169812 ES	462	/* 1 day timeout maximum, -1 means infinite */
77169812 ES	463	if (val < -1 \|\| val > 86400)
a5ea70d2 CM	464	return -EINVAL;
a5ea70d2 CM	465
77169812 ES	466	if (val == -1)
	467	cfg->retry_timeout = XFS_ERR_RETRY_FOREVER;
	468	else {
	469	cfg->retry_timeout = msecs_to_jiffies(val * MSEC_PER_SEC);
	470	ASSERT(msecs_to_jiffies(val * MSEC_PER_SEC) < LONG_MAX);
	471	}
a5ea70d2 CM	472	return count;
	473	}
	474	XFS_SYSFS_ATTR_RW(retry_timeout_seconds);
	475
e6b3bb78 CM	476	static ssize_t
	477	fail_at_unmount_show(
	478	struct kobject *kobject,
	479	char *buf)
	480	{
	481	struct xfs_mount *mp = err_to_mp(kobject);
	482
	483	return snprintf(buf, PAGE_SIZE, "%d\n", mp->m_fail_unmount);
	484	}
	485
	486	static ssize_t
	487	fail_at_unmount_store(
	488	struct kobject *kobject,
	489	const char *buf,
	490	size_t count)
	491	{
	492	struct xfs_mount *mp = err_to_mp(kobject);
	493	int ret;
	494	int val;
	495
	496	ret = kstrtoint(buf, 0, &val);
	497	if (ret)
	498	return ret;
	499
	500	if (val < 0 \|\| val > 1)
	501	return -EINVAL;
	502
	503	mp->m_fail_unmount = val;
	504	return count;
	505	}
	506	XFS_SYSFS_ATTR_RW(fail_at_unmount);
	507
a5ea70d2 CM	508	static struct attribute *xfs_error_attrs[] = {
	509	ATTR_LIST(max_retries),
	510	ATTR_LIST(retry_timeout_seconds),
	511	NULL,
	512	};
	513
	514
192852be CM	515	struct kobj_type xfs_error_cfg_ktype = {
	516	.release = xfs_sysfs_release,
	517	.sysfs_ops = &xfs_sysfs_ops,
	518	.default_attrs = xfs_error_attrs,
	519	};
	520
	521	struct kobj_type xfs_error_ktype = {
	522	.release = xfs_sysfs_release,
e6b3bb78	523	.sysfs_ops = &xfs_sysfs_ops,
192852be CM	524	};
192852be CM	525
ef6a50fb CM	526	/*
	527	* Error initialization tables. These need to be ordered in the same
	528	* order as the enums used to index the array. All class init tables need to
	529	* define a "default" behaviour as the first entry, all other entries can be
	530	* empty.
	531	*/
	532	struct xfs_error_init {
	533	char *name;
	534	int max_retries;
a5ea70d2	535	int retry_timeout; /* in seconds */
ef6a50fb CM	536	};
	537
	538	static const struct xfs_error_init xfs_error_meta_init[XFS_ERR_ERRNO_MAX] = {
	539	{ .name = "default",
e0a431b3	540	.max_retries = XFS_ERR_RETRY_FOREVER,
77169812	541	.retry_timeout = XFS_ERR_RETRY_FOREVER,
ef6a50fb	542	},
e0a431b3 CM	543	{ .name = "EIO",
e0a431b3 CM	544	.max_retries = XFS_ERR_RETRY_FOREVER,
77169812	545	.retry_timeout = XFS_ERR_RETRY_FOREVER,
e0a431b3 CM	546	},
	547	{ .name = "ENOSPC",
	548	.max_retries = XFS_ERR_RETRY_FOREVER,
77169812	549	.retry_timeout = XFS_ERR_RETRY_FOREVER,
e0a431b3 CM	550	},
e0a431b3 CM	551	{ .name = "ENODEV",
77169812 ES	552	.max_retries = 0, /* We can't recover from devices disappearing */
77169812 ES	553	.retry_timeout = 0,
e0a431b3	554	},
ef6a50fb CM	555	};
	556
	557	static int
	558	xfs_error_sysfs_init_class(
	559	struct xfs_mount *mp,
	560	int class,
	561	const char *parent_name,
	562	struct xfs_kobj *parent_kobj,
	563	const struct xfs_error_init init[])
	564	{
	565	struct xfs_error_cfg *cfg;
	566	int error;
	567	int i;
	568
	569	ASSERT(class < XFS_ERR_CLASS_MAX);
	570
	571	error = xfs_sysfs_init(parent_kobj, &xfs_error_ktype,
	572	&mp->m_error_kobj, parent_name);
	573	if (error)
	574	return error;
	575
	576	for (i = 0; i < XFS_ERR_ERRNO_MAX; i++) {
	577	cfg = &mp->m_error_cfg[class][i];
	578	error = xfs_sysfs_init(&cfg->kobj, &xfs_error_cfg_ktype,
	579	parent_kobj, init[i].name);
	580	if (error)
	581	goto out_error;
	582
	583	cfg->max_retries = init[i].max_retries;
77169812 ES	584	if (init[i].retry_timeout == XFS_ERR_RETRY_FOREVER)
	585	cfg->retry_timeout = XFS_ERR_RETRY_FOREVER;
	586	else
	587	cfg->retry_timeout = msecs_to_jiffies(
a5ea70d2	588	init[i].retry_timeout * MSEC_PER_SEC);
ef6a50fb CM	589	}
	590	return 0;
	591
	592	out_error:
	593	/* unwind the entries that succeeded */
	594	for (i--; i >= 0; i--) {
	595	cfg = &mp->m_error_cfg[class][i];
	596	xfs_sysfs_del(&cfg->kobj);
	597	}
	598	xfs_sysfs_del(parent_kobj);
	599	return error;
	600	}
	601
192852be CM	602	int
	603	xfs_error_sysfs_init(
	604	struct xfs_mount *mp)
	605	{
	606	int error;
	607
	608	/* .../xfs/<dev>/error/ */
	609	error = xfs_sysfs_init(&mp->m_error_kobj, &xfs_error_ktype,
	610	&mp->m_kobj, "error");
ffd40ef6 CM	611	if (error)
	612	return error;
	613
e6b3bb78 CM	614	error = sysfs_create_file(&mp->m_error_kobj.kobject,
	615	ATTR_LIST(fail_at_unmount));
	616
	617	if (error)
	618	goto out_error;
	619
ffd40ef6	620	/* .../xfs/<dev>/error/metadata/ */
ef6a50fb CM	621	error = xfs_error_sysfs_init_class(mp, XFS_ERR_METADATA,
	622	"metadata", &mp->m_error_meta_kobj,
	623	xfs_error_meta_init);
ffd40ef6 CM	624	if (error)
	625	goto out_error;
	626
ffd40ef6 CM	627	return 0;
ffd40ef6 CM	628
ffd40ef6 CM	629	out_error:
ffd40ef6 CM	630	xfs_sysfs_del(&mp->m_error_kobj);
192852be CM	631	return error;
	632	}
	633
	634	void
	635	xfs_error_sysfs_del(
	636	struct xfs_mount *mp)
	637	{
ffd40ef6 CM	638	struct xfs_error_cfg *cfg;
	639	int i, j;
	640
	641	for (i = 0; i < XFS_ERR_CLASS_MAX; i++) {
	642	for (j = 0; j < XFS_ERR_ERRNO_MAX; j++) {
	643	cfg = &mp->m_error_cfg[i][j];
	644
	645	xfs_sysfs_del(&cfg->kobj);
	646	}
	647	}
	648	xfs_sysfs_del(&mp->m_error_meta_kobj);
192852be CM	649	xfs_sysfs_del(&mp->m_error_kobj);
192852be CM	650	}
df309390 CM	651
	652	struct xfs_error_cfg *
	653	xfs_error_get_cfg(
	654	struct xfs_mount *mp,
	655	int error_class,
	656	int error)
	657	{
	658	struct xfs_error_cfg *cfg;
	659
e97f6c54 ES	660	if (error < 0)
	661	error = -error;
	662
df309390	663	switch (error) {
e0a431b3 CM	664	case EIO:
	665	cfg = &mp->m_error_cfg[error_class][XFS_ERR_EIO];
	666	break;
	667	case ENOSPC:
	668	cfg = &mp->m_error_cfg[error_class][XFS_ERR_ENOSPC];
	669	break;
	670	case ENODEV:
	671	cfg = &mp->m_error_cfg[error_class][XFS_ERR_ENODEV];
	672	break;
df309390 CM	673	default:
	674	cfg = &mp->m_error_cfg[error_class][XFS_ERR_DEFAULT];
	675	break;
	676	}
	677
	678	return cfg;
	679	}