[linux.git] / fs / gfs2 / sys.c

/*
 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
 * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
 *
 * This copyrighted material is made available to anyone wishing to use,
 * modify, copy, or redistribute it subject to the terms and conditions
 * of the GNU General Public License version 2.
 */

#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
#include <linux/module.h>
#include <linux/kobject.h>
#include <linux/gfs2_ondisk.h>
#include <linux/lm_interface.h>
#include <asm/uaccess.h>

#include "gfs2.h"
#include "incore.h"
#include "sys.h"
#include "super.h"
#include "glock.h"
#include "quota.h"
#include "util.h"

char *gfs2_sys_margs;
spinlock_t gfs2_sys_margs_lock;

static ssize_t id_show(struct gfs2_sbd *sdp, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%u:%u\n",
			MAJOR(sdp->sd_vfs->s_dev), MINOR(sdp->sd_vfs->s_dev));
}

static ssize_t fsname_show(struct gfs2_sbd *sdp, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%s\n", sdp->sd_fsname);
}

static ssize_t freeze_show(struct gfs2_sbd *sdp, char *buf)
{
	unsigned int count;

	mutex_lock(&sdp->sd_freeze_lock);
	count = sdp->sd_freeze_count;
	mutex_unlock(&sdp->sd_freeze_lock);

	return snprintf(buf, PAGE_SIZE, "%u\n", count);
}

static ssize_t freeze_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
{
	ssize_t ret = len;
	int error = 0;
	int n = simple_strtol(buf, NULL, 0);

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;

	switch (n) {
	case 0:
		gfs2_unfreeze_fs(sdp);
		break;
	case 1:
		error = gfs2_freeze_fs(sdp);
		break;
	default:
		ret = -EINVAL;
	}

	if (error)
		fs_warn(sdp, "freeze %d error %d", n, error);

	return ret;
}

static ssize_t withdraw_show(struct gfs2_sbd *sdp, char *buf)
{
	unsigned int b = test_bit(SDF_SHUTDOWN, &sdp->sd_flags);
	return snprintf(buf, PAGE_SIZE, "%u\n", b);
}

static ssize_t withdraw_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
{
	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;

	if (simple_strtol(buf, NULL, 0) != 1)
		return -EINVAL;

	gfs2_lm_withdraw(sdp,
		"GFS2: fsid=%s: withdrawing from cluster at user's request\n",
		sdp->sd_fsname);
	return len;
}

static ssize_t statfs_sync_store(struct gfs2_sbd *sdp, const char *buf,
				 size_t len)
{
	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;

	if (simple_strtol(buf, NULL, 0) != 1)
		return -EINVAL;

	gfs2_statfs_sync(sdp);
	return len;
}

static ssize_t shrink_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
{
	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;

	if (simple_strtol(buf, NULL, 0) != 1)
		return -EINVAL;

	gfs2_gl_hash_clear(sdp, NO_WAIT);
	return len;
}

static ssize_t quota_sync_store(struct gfs2_sbd *sdp, const char *buf,
				size_t len)
{
	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;

	if (simple_strtol(buf, NULL, 0) != 1)
		return -EINVAL;

	gfs2_quota_sync(sdp);
	return len;
}

static ssize_t quota_refresh_user_store(struct gfs2_sbd *sdp, const char *buf,
					size_t len)
{
	u32 id;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;

	id = simple_strtoul(buf, NULL, 0);

	gfs2_quota_refresh(sdp, 1, id);
	return len;
}

static ssize_t quota_refresh_group_store(struct gfs2_sbd *sdp, const char *buf,
					 size_t len)
{
	u32 id;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;

	id = simple_strtoul(buf, NULL, 0);

	gfs2_quota_refresh(sdp, 0, id);
	return len;
}

struct gfs2_attr {
	struct attribute attr;
	ssize_t (*show)(struct gfs2_sbd *, char *);
	ssize_t (*store)(struct gfs2_sbd *, const char *, size_t);
};

#define GFS2_ATTR(name, mode, show, store) \
static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store)

GFS2_ATTR(id,                  0444, id_show,       NULL);
GFS2_ATTR(fsname,              0444, fsname_show,   NULL);
GFS2_ATTR(freeze,              0644, freeze_show,   freeze_store);
GFS2_ATTR(shrink,              0200, NULL,          shrink_store);
GFS2_ATTR(withdraw,            0644, withdraw_show, withdraw_store);
GFS2_ATTR(statfs_sync,         0200, NULL,          statfs_sync_store);
GFS2_ATTR(quota_sync,          0200, NULL,          quota_sync_store);
GFS2_ATTR(quota_refresh_user,  0200, NULL,          quota_refresh_user_store);
GFS2_ATTR(quota_refresh_group, 0200, NULL,          quota_refresh_group_store);

static struct attribute *gfs2_attrs[] = {
	&gfs2_attr_id.attr,
	&gfs2_attr_fsname.attr,
	&gfs2_attr_freeze.attr,
	&gfs2_attr_shrink.attr,
	&gfs2_attr_withdraw.attr,
	&gfs2_attr_statfs_sync.attr,
	&gfs2_attr_quota_sync.attr,
	&gfs2_attr_quota_refresh_user.attr,
	&gfs2_attr_quota_refresh_group.attr,
	NULL,
};

static ssize_t gfs2_attr_show(struct kobject *kobj, struct attribute *attr,
			      char *buf)
{
	struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
	struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
	return a->show ? a->show(sdp, buf) : 0;
}

static ssize_t gfs2_attr_store(struct kobject *kobj, struct attribute *attr,
			       const char *buf, size_t len)
{
	struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
	struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
	return a->store ? a->store(sdp, buf, len) : len;
}

static struct sysfs_ops gfs2_attr_ops = {
	.show  = gfs2_attr_show,
	.store = gfs2_attr_store,
};

static struct kobj_type gfs2_ktype = {
	.default_attrs = gfs2_attrs,
	.sysfs_ops     = &gfs2_attr_ops,
};

static struct kset *gfs2_kset;

/*
 * display struct lm_lockstruct fields
 */

struct lockstruct_attr {
	struct attribute attr;
	ssize_t (*show)(struct gfs2_sbd *, char *);
};

#define LOCKSTRUCT_ATTR(name, fmt)                                          \
static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                 \
{                                                                           \
	return snprintf(buf, PAGE_SIZE, fmt, sdp->sd_lockstruct.ls_##name); \
}                                                                           \
static struct lockstruct_attr lockstruct_attr_##name = __ATTR_RO(name)

LOCKSTRUCT_ATTR(jid,      "%u\n");
LOCKSTRUCT_ATTR(first,    "%u\n");
LOCKSTRUCT_ATTR(lvb_size, "%u\n");
LOCKSTRUCT_ATTR(flags,    "%d\n");

static struct attribute *lockstruct_attrs[] = {
	&lockstruct_attr_jid.attr,
	&lockstruct_attr_first.attr,
	&lockstruct_attr_lvb_size.attr,
	&lockstruct_attr_flags.attr,
	NULL,
};

/*
 * display struct gfs2_args fields
 */

struct args_attr {
	struct attribute attr;
	ssize_t (*show)(struct gfs2_sbd *, char *);
};

#define ARGS_ATTR(name, fmt)                                                \
static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                 \
{                                                                           \
	return snprintf(buf, PAGE_SIZE, fmt, sdp->sd_args.ar_##name);       \
}                                                                           \
static struct args_attr args_attr_##name = __ATTR_RO(name)

ARGS_ATTR(lockproto,       "%s\n");
ARGS_ATTR(locktable,       "%s\n");
ARGS_ATTR(hostdata,        "%s\n");
ARGS_ATTR(spectator,       "%d\n");
ARGS_ATTR(ignore_local_fs, "%d\n");
ARGS_ATTR(localcaching,    "%d\n");
ARGS_ATTR(localflocks,     "%d\n");
ARGS_ATTR(debug,           "%d\n");
ARGS_ATTR(upgrade,         "%d\n");
ARGS_ATTR(num_glockd,      "%u\n");
ARGS_ATTR(posix_acl,       "%d\n");
ARGS_ATTR(quota,           "%u\n");
ARGS_ATTR(suiddir,         "%d\n");
ARGS_ATTR(data,            "%d\n");

/* one oddball doesn't fit the macro mold */
static ssize_t noatime_show(struct gfs2_sbd *sdp, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%d\n",
			!!test_bit(SDF_NOATIME, &sdp->sd_flags));
}
static struct args_attr args_attr_noatime = __ATTR_RO(noatime);

static struct attribute *args_attrs[] = {
	&args_attr_lockproto.attr,
	&args_attr_locktable.attr,
	&args_attr_hostdata.attr,
	&args_attr_spectator.attr,
	&args_attr_ignore_local_fs.attr,
	&args_attr_localcaching.attr,
	&args_attr_localflocks.attr,
	&args_attr_debug.attr,
	&args_attr_upgrade.attr,
	&args_attr_num_glockd.attr,
	&args_attr_posix_acl.attr,
	&args_attr_quota.attr,
	&args_attr_suiddir.attr,
	&args_attr_data.attr,
	&args_attr_noatime.attr,
	NULL,
};

/*
 * display counters from superblock
 */

struct counters_attr {
	struct attribute attr;
	ssize_t (*show)(struct gfs2_sbd *, char *);
};

#define COUNTERS_ATTR(name, fmt)                                            \
static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                 \
{                                                                           \
	return snprintf(buf, PAGE_SIZE, fmt,                                \
			(unsigned int)atomic_read(&sdp->sd_##name));        \
}                                                                           \
static struct counters_attr counters_attr_##name = __ATTR_RO(name)

COUNTERS_ATTR(reclaimed,        "%u\n");

static struct attribute *counters_attrs[] = {
	&counters_attr_reclaimed.attr,
	NULL,
};

/*
 * get and set struct gfs2_tune fields
 */

static ssize_t quota_scale_show(struct gfs2_sbd *sdp, char *buf)
{
	return snprintf(buf, PAGE_SIZE, "%u %u\n",
			sdp->sd_tune.gt_quota_scale_num,
			sdp->sd_tune.gt_quota_scale_den);
}

static ssize_t quota_scale_store(struct gfs2_sbd *sdp, const char *buf,
				 size_t len)
{
	struct gfs2_tune *gt = &sdp->sd_tune;
	unsigned int x, y;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;

	if (sscanf(buf, "%u %u", &x, &y) != 2 || !y)
		return -EINVAL;

	spin_lock(&gt->gt_spin);
	gt->gt_quota_scale_num = x;
	gt->gt_quota_scale_den = y;
	spin_unlock(&gt->gt_spin);
	return len;
}

static ssize_t tune_set(struct gfs2_sbd *sdp, unsigned int *field,
			int check_zero, const char *buf, size_t len)
{
	struct gfs2_tune *gt = &sdp->sd_tune;
	unsigned int x;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;

	x = simple_strtoul(buf, NULL, 0);

	if (check_zero && !x)
		return -EINVAL;

	spin_lock(&gt->gt_spin);
	*field = x;
	spin_unlock(&gt->gt_spin);
	return len;
}

struct tune_attr {
	struct attribute attr;
	ssize_t (*show)(struct gfs2_sbd *, char *);
	ssize_t (*store)(struct gfs2_sbd *, const char *, size_t);
};

#define TUNE_ATTR_3(name, show, store)                                        \
static struct tune_attr tune_attr_##name = __ATTR(name, 0644, show, store)

#define TUNE_ATTR_2(name, store)                                              \
static ssize_t name##_show(struct gfs2_sbd *sdp, char *buf)                   \
{                                                                             \
	return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name);      \
}                                                                             \
TUNE_ATTR_3(name, name##_show, store)

#define TUNE_ATTR(name, check_zero)                                           \
static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
{                                                                             \
	return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len);  \
}                                                                             \
TUNE_ATTR_2(name, name##_store)

#define TUNE_ATTR_DAEMON(name, process)                                       \
static ssize_t name##_store(struct gfs2_sbd *sdp, const char *buf, size_t len)\
{                                                                             \
	ssize_t r = tune_set(sdp, &sdp->sd_tune.gt_##name, 1, buf, len);      \
	wake_up_process(sdp->sd_##process);                                   \
	return r;                                                             \
}                                                                             \
TUNE_ATTR_2(name, name##_store)

TUNE_ATTR(demote_secs, 0);
TUNE_ATTR(incore_log_blocks, 0);
TUNE_ATTR(log_flush_secs, 0);
TUNE_ATTR(quota_warn_period, 0);
TUNE_ATTR(quota_quantum, 0);
TUNE_ATTR(atime_quantum, 0);
TUNE_ATTR(max_readahead, 0);
TUNE_ATTR(complain_secs, 0);
TUNE_ATTR(statfs_slow, 0);
TUNE_ATTR(new_files_jdata, 0);
TUNE_ATTR(new_files_directio, 0);
TUNE_ATTR(quota_simul_sync, 1);
TUNE_ATTR(quota_cache_secs, 1);
TUNE_ATTR(stall_secs, 1);
TUNE_ATTR(statfs_quantum, 1);
TUNE_ATTR_DAEMON(recoverd_secs, recoverd_process);
TUNE_ATTR_DAEMON(logd_secs, logd_process);
TUNE_ATTR_DAEMON(quotad_secs, quotad_process);
TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);

static struct attribute *tune_attrs[] = {
	&tune_attr_demote_secs.attr,
	&tune_attr_incore_log_blocks.attr,
	&tune_attr_log_flush_secs.attr,
	&tune_attr_quota_warn_period.attr,
	&tune_attr_quota_quantum.attr,
	&tune_attr_atime_quantum.attr,
	&tune_attr_max_readahead.attr,
	&tune_attr_complain_secs.attr,
	&tune_attr_statfs_slow.attr,
	&tune_attr_quota_simul_sync.attr,
	&tune_attr_quota_cache_secs.attr,
	&tune_attr_stall_secs.attr,
	&tune_attr_statfs_quantum.attr,
	&tune_attr_recoverd_secs.attr,
	&tune_attr_logd_secs.attr,
	&tune_attr_quotad_secs.attr,
	&tune_attr_quota_scale.attr,
	&tune_attr_new_files_jdata.attr,
	&tune_attr_new_files_directio.attr,
	NULL,
};

static struct attribute_group lockstruct_group = {
	.name = "lockstruct",
	.attrs = lockstruct_attrs,
};

static struct attribute_group counters_group = {
	.name = "counters",
	.attrs = counters_attrs,
};

static struct attribute_group args_group = {
	.name = "args",
	.attrs = args_attrs,
};

static struct attribute_group tune_group = {
	.name = "tune",
	.attrs = tune_attrs,
};

int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
{
	int error;

	sdp->sd_kobj.kset = gfs2_kset;
	error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL,
				     "%s", sdp->sd_table_name);
	if (error)
		goto fail;

	error = sysfs_create_group(&sdp->sd_kobj, &lockstruct_group);
	if (error)
		goto fail_reg;

	error = sysfs_create_group(&sdp->sd_kobj, &counters_group);
	if (error)
		goto fail_lockstruct;

	error = sysfs_create_group(&sdp->sd_kobj, &args_group);
	if (error)
		goto fail_counters;

	error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
	if (error)
		goto fail_args;

	kobject_uevent(&sdp->sd_kobj, KOBJ_ADD);
	return 0;

fail_args:
	sysfs_remove_group(&sdp->sd_kobj, &args_group);
fail_counters:
	sysfs_remove_group(&sdp->sd_kobj, &counters_group);
fail_lockstruct:
	sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group);
fail_reg:
	kobject_put(&sdp->sd_kobj);
fail:
	fs_err(sdp, "error %d adding sysfs files", error);
	return error;
}

void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
{
	sysfs_remove_group(&sdp->sd_kobj, &tune_group);
	sysfs_remove_group(&sdp->sd_kobj, &args_group);
	sysfs_remove_group(&sdp->sd_kobj, &counters_group);
	sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group);
	kobject_put(&sdp->sd_kobj);
}

int gfs2_sys_init(void)
{
	gfs2_sys_margs = NULL;
	spin_lock_init(&gfs2_sys_margs_lock);
	gfs2_kset = kset_create_and_add("gfs2", NULL, fs_kobj);
	if (!gfs2_kset)
		return -ENOMEM;
	return 0;
}

void gfs2_sys_uninit(void)
{
	kfree(gfs2_sys_margs);
	kset_unregister(gfs2_kset);
}
Commit	Line	Data
b3b94faa DT	1	/*
b3b94faa DT	2	* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3a8a9a10	3	* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
b3b94faa DT	4	*
	5	* This copyrighted material is made available to anyone wishing to use,
	6	* modify, copy, or redistribute it subject to the terms and conditions
e9fc2aa0	7	* of the GNU General Public License version 2.
b3b94faa DT	8	*/
	9
	10	#include <linux/sched.h>
	11	#include <linux/slab.h>
	12	#include <linux/spinlock.h>
	13	#include <linux/completion.h>
	14	#include <linux/buffer_head.h>
	15	#include <linux/module.h>
	16	#include <linux/kobject.h>
5c676f6d	17	#include <linux/gfs2_ondisk.h>
7d308590	18	#include <linux/lm_interface.h>
b3b94faa DT	19	#include <asm/uaccess.h>
	20
	21	#include "gfs2.h"
5c676f6d	22	#include "incore.h"
b3b94faa DT	23	#include "sys.h"
	24	#include "super.h"
	25	#include "glock.h"
	26	#include "quota.h"
5c676f6d	27	#include "util.h"
b3b94faa DT	28
	29	char *gfs2_sys_margs;
	30	spinlock_t gfs2_sys_margs_lock;
	31
	32	static ssize_t id_show(struct gfs2_sbd sdp, char buf)
	33	{
c7227e46 BP	34	return snprintf(buf, PAGE_SIZE, "%u:%u\n",
c7227e46 BP	35	MAJOR(sdp->sd_vfs->s_dev), MINOR(sdp->sd_vfs->s_dev));
b3b94faa DT	36	}
	37
	38	static ssize_t fsname_show(struct gfs2_sbd sdp, char buf)
	39	{
3204a6c0	40	return snprintf(buf, PAGE_SIZE, "%s\n", sdp->sd_fsname);
b3b94faa DT	41	}
	42
	43	static ssize_t freeze_show(struct gfs2_sbd sdp, char buf)
	44	{
	45	unsigned int count;
	46
f55ab26a	47	mutex_lock(&sdp->sd_freeze_lock);
b3b94faa	48	count = sdp->sd_freeze_count;
f55ab26a	49	mutex_unlock(&sdp->sd_freeze_lock);
b3b94faa	50
3204a6c0	51	return snprintf(buf, PAGE_SIZE, "%u\n", count);
b3b94faa DT	52	}
	53
	54	static ssize_t freeze_store(struct gfs2_sbd sdp, const char buf, size_t len)
	55	{
	56	ssize_t ret = len;
	57	int error = 0;
	58	int n = simple_strtol(buf, NULL, 0);
	59
	60	if (!capable(CAP_SYS_ADMIN))
	61	return -EACCES;
	62
	63	switch (n) {
	64	case 0:
	65	gfs2_unfreeze_fs(sdp);
	66	break;
	67	case 1:
	68	error = gfs2_freeze_fs(sdp);
	69	break;
	70	default:
	71	ret = -EINVAL;
	72	}
	73
	74	if (error)
	75	fs_warn(sdp, "freeze %d error %d", n, error);
	76
	77	return ret;
	78	}
	79
	80	static ssize_t withdraw_show(struct gfs2_sbd sdp, char buf)
	81	{
	82	unsigned int b = test_bit(SDF_SHUTDOWN, &sdp->sd_flags);
3204a6c0	83	return snprintf(buf, PAGE_SIZE, "%u\n", b);
b3b94faa DT	84	}
	85
	86	static ssize_t withdraw_store(struct gfs2_sbd sdp, const char buf, size_t len)
	87	{
	88	if (!capable(CAP_SYS_ADMIN))
	89	return -EACCES;
	90
	91	if (simple_strtol(buf, NULL, 0) != 1)
	92	return -EINVAL;
	93
	94	gfs2_lm_withdraw(sdp,
	95	"GFS2: fsid=%s: withdrawing from cluster at user's request\n",
	96	sdp->sd_fsname);
	97	return len;
	98	}
	99
	100	static ssize_t statfs_sync_store(struct gfs2_sbd sdp, const char buf,
	101	size_t len)
	102	{
	103	if (!capable(CAP_SYS_ADMIN))
	104	return -EACCES;
	105
	106	if (simple_strtol(buf, NULL, 0) != 1)
	107	return -EINVAL;
	108
	109	gfs2_statfs_sync(sdp);
	110	return len;
	111	}
	112
	113	static ssize_t shrink_store(struct gfs2_sbd sdp, const char buf, size_t len)
	114	{
	115	if (!capable(CAP_SYS_ADMIN))
	116	return -EACCES;
	117
	118	if (simple_strtol(buf, NULL, 0) != 1)
	119	return -EINVAL;
	120
	121	gfs2_gl_hash_clear(sdp, NO_WAIT);
	122	return len;
	123	}
	124
	125	static ssize_t quota_sync_store(struct gfs2_sbd sdp, const char buf,
	126	size_t len)
	127	{
	128	if (!capable(CAP_SYS_ADMIN))
	129	return -EACCES;
	130
	131	if (simple_strtol(buf, NULL, 0) != 1)
	132	return -EINVAL;
	133
	134	gfs2_quota_sync(sdp);
	135	return len;
	136	}
	137
	138	static ssize_t quota_refresh_user_store(struct gfs2_sbd sdp, const char buf,
	139	size_t len)
	140	{
cd915493	141	u32 id;
b3b94faa DT	142
	143	if (!capable(CAP_SYS_ADMIN))
	144	return -EACCES;
	145
	146	id = simple_strtoul(buf, NULL, 0);
	147
	148	gfs2_quota_refresh(sdp, 1, id);
	149	return len;
	150	}
	151
	152	static ssize_t quota_refresh_group_store(struct gfs2_sbd sdp, const char buf,
	153	size_t len)
	154	{
cd915493	155	u32 id;
b3b94faa DT	156
	157	if (!capable(CAP_SYS_ADMIN))
	158	return -EACCES;
	159
	160	id = simple_strtoul(buf, NULL, 0);
	161
	162	gfs2_quota_refresh(sdp, 0, id);
	163	return len;
	164	}
	165
	166	struct gfs2_attr {
	167	struct attribute attr;
	168	ssize_t (show)(struct gfs2_sbd , char *);
	169	ssize_t (store)(struct gfs2_sbd , const char *, size_t);
	170	};
	171
	172	#define GFS2_ATTR(name, mode, show, store) \
	173	static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store)
	174
	175	GFS2_ATTR(id, 0444, id_show, NULL);
	176	GFS2_ATTR(fsname, 0444, fsname_show, NULL);
	177	GFS2_ATTR(freeze, 0644, freeze_show, freeze_store);
	178	GFS2_ATTR(shrink, 0200, NULL, shrink_store);
	179	GFS2_ATTR(withdraw, 0644, withdraw_show, withdraw_store);
	180	GFS2_ATTR(statfs_sync, 0200, NULL, statfs_sync_store);
	181	GFS2_ATTR(quota_sync, 0200, NULL, quota_sync_store);
	182	GFS2_ATTR(quota_refresh_user, 0200, NULL, quota_refresh_user_store);
	183	GFS2_ATTR(quota_refresh_group, 0200, NULL, quota_refresh_group_store);
	184
	185	static struct attribute *gfs2_attrs[] = {
	186	&gfs2_attr_id.attr,
	187	&gfs2_attr_fsname.attr,
	188	&gfs2_attr_freeze.attr,
	189	&gfs2_attr_shrink.attr,
	190	&gfs2_attr_withdraw.attr,
	191	&gfs2_attr_statfs_sync.attr,
	192	&gfs2_attr_quota_sync.attr,
	193	&gfs2_attr_quota_refresh_user.attr,
	194	&gfs2_attr_quota_refresh_group.attr,
	195	NULL,
	196	};
	197
	198	static ssize_t gfs2_attr_show(struct kobject kobj, struct attribute attr,
	199	char *buf)
	200	{
	201	struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
	202	struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
	203	return a->show ? a->show(sdp, buf) : 0;
	204	}
	205
	206	static ssize_t gfs2_attr_store(struct kobject kobj, struct attribute attr,
	207	const char *buf, size_t len)
	208	{
	209	struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
	210	struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
	211	return a->store ? a->store(sdp, buf, len) : len;
	212	}
	213
	214	static struct sysfs_ops gfs2_attr_ops = {
	215	.show = gfs2_attr_show,
	216	.store = gfs2_attr_store,
	217	};
	218
	219	static struct kobj_type gfs2_ktype = {
220	.default_attrs = gfs2_attrs,
221	.sysfs_ops = &gfs2_attr_ops,
222	};
223
9bec101a	224	static struct kset *gfs2_kset;
b3b94faa DT	225
	226	/*
	227	* display struct lm_lockstruct fields
	228	*/
	229
	230	struct lockstruct_attr {
	231	struct attribute attr;
	232	ssize_t (show)(struct gfs2_sbd , char *);
	233	};
	234
	235	#define LOCKSTRUCT_ATTR(name, fmt) \
	236	static ssize_t name##_show(struct gfs2_sbd sdp, char buf) \
	237	{ \
3204a6c0	238	return snprintf(buf, PAGE_SIZE, fmt, sdp->sd_lockstruct.ls_##name); \
b3b94faa DT	239	} \
	240	static struct lockstruct_attr lockstruct_attr_##name = __ATTR_RO(name)
	241
	242	LOCKSTRUCT_ATTR(jid, "%u\n");
	243	LOCKSTRUCT_ATTR(first, "%u\n");
	244	LOCKSTRUCT_ATTR(lvb_size, "%u\n");
	245	LOCKSTRUCT_ATTR(flags, "%d\n");
	246
	247	static struct attribute *lockstruct_attrs[] = {
	248	&lockstruct_attr_jid.attr,
	249	&lockstruct_attr_first.attr,
	250	&lockstruct_attr_lvb_size.attr,
	251	&lockstruct_attr_flags.attr,
ea67eedb	252	NULL,
b3b94faa DT	253	};
	254
	255	/*
	256	* display struct gfs2_args fields
	257	*/
	258
	259	struct args_attr {
	260	struct attribute attr;
	261	ssize_t (show)(struct gfs2_sbd , char *);
	262	};
	263
	264	#define ARGS_ATTR(name, fmt) \
	265	static ssize_t name##_show(struct gfs2_sbd sdp, char buf) \
	266	{ \
3204a6c0	267	return snprintf(buf, PAGE_SIZE, fmt, sdp->sd_args.ar_##name); \
b3b94faa DT	268	} \
	269	static struct args_attr args_attr_##name = __ATTR_RO(name)
	270
	271	ARGS_ATTR(lockproto, "%s\n");
	272	ARGS_ATTR(locktable, "%s\n");
	273	ARGS_ATTR(hostdata, "%s\n");
	274	ARGS_ATTR(spectator, "%d\n");
	275	ARGS_ATTR(ignore_local_fs, "%d\n");
	276	ARGS_ATTR(localcaching, "%d\n");
	277	ARGS_ATTR(localflocks, "%d\n");
	278	ARGS_ATTR(debug, "%d\n");
	279	ARGS_ATTR(upgrade, "%d\n");
	280	ARGS_ATTR(num_glockd, "%u\n");
	281	ARGS_ATTR(posix_acl, "%d\n");
	282	ARGS_ATTR(quota, "%u\n");
	283	ARGS_ATTR(suiddir, "%d\n");
	284	ARGS_ATTR(data, "%d\n");
	285
	286	/* one oddball doesn't fit the macro mold */
	287	static ssize_t noatime_show(struct gfs2_sbd sdp, char buf)
	288	{
3204a6c0 DT	289	return snprintf(buf, PAGE_SIZE, "%d\n",
3204a6c0 DT	290	!!test_bit(SDF_NOATIME, &sdp->sd_flags));
b3b94faa DT	291	}
	292	static struct args_attr args_attr_noatime = __ATTR_RO(noatime);
	293
	294	static struct attribute *args_attrs[] = {
	295	&args_attr_lockproto.attr,
	296	&args_attr_locktable.attr,
	297	&args_attr_hostdata.attr,
	298	&args_attr_spectator.attr,
	299	&args_attr_ignore_local_fs.attr,
	300	&args_attr_localcaching.attr,
	301	&args_attr_localflocks.attr,
	302	&args_attr_debug.attr,
	303	&args_attr_upgrade.attr,
	304	&args_attr_num_glockd.attr,
	305	&args_attr_posix_acl.attr,
	306	&args_attr_quota.attr,
	307	&args_attr_suiddir.attr,
	308	&args_attr_data.attr,
	309	&args_attr_noatime.attr,
ea67eedb	310	NULL,
b3b94faa DT	311	};
	312
	313	/*
	314	* display counters from superblock
	315	*/
	316
	317	struct counters_attr {
	318	struct attribute attr;
	319	ssize_t (show)(struct gfs2_sbd , char *);
	320	};
	321
6a6b3d01	322	#define COUNTERS_ATTR(name, fmt) \
b3b94faa DT	323	static ssize_t name##_show(struct gfs2_sbd sdp, char buf) \
b3b94faa DT	324	{ \
3204a6c0 DT	325	return snprintf(buf, PAGE_SIZE, fmt, \
3204a6c0 DT	326	(unsigned int)atomic_read(&sdp->sd_##name)); \
b3b94faa DT	327	} \
	328	static struct counters_attr counters_attr_##name = __ATTR_RO(name)
	329
6a6b3d01	330	COUNTERS_ATTR(reclaimed, "%u\n");
b3b94faa DT	331
b3b94faa DT	332	static struct attribute *counters_attrs[] = {
b3b94faa	333	&counters_attr_reclaimed.attr,
ea67eedb	334	NULL,
b3b94faa DT	335	};
	336
	337	/*
	338	* get and set struct gfs2_tune fields
	339	*/
	340
	341	static ssize_t quota_scale_show(struct gfs2_sbd sdp, char buf)
	342	{
3204a6c0 DT	343	return snprintf(buf, PAGE_SIZE, "%u %u\n",
	344	sdp->sd_tune.gt_quota_scale_num,
	345	sdp->sd_tune.gt_quota_scale_den);
b3b94faa DT	346	}
	347
	348	static ssize_t quota_scale_store(struct gfs2_sbd sdp, const char buf,
	349	size_t len)
	350	{
	351	struct gfs2_tune *gt = &sdp->sd_tune;
	352	unsigned int x, y;
	353
	354	if (!capable(CAP_SYS_ADMIN))
	355	return -EACCES;
	356
	357	if (sscanf(buf, "%u %u", &x, &y) != 2 \|\| !y)
	358	return -EINVAL;
	359
	360	spin_lock(&gt->gt_spin);
	361	gt->gt_quota_scale_num = x;
	362	gt->gt_quota_scale_den = y;
	363	spin_unlock(&gt->gt_spin);
	364	return len;
	365	}
	366
	367	static ssize_t tune_set(struct gfs2_sbd sdp, unsigned int field,
	368	int check_zero, const char *buf, size_t len)
	369	{
	370	struct gfs2_tune *gt = &sdp->sd_tune;
	371	unsigned int x;
	372
	373	if (!capable(CAP_SYS_ADMIN))
	374	return -EACCES;
	375
	376	x = simple_strtoul(buf, NULL, 0);
	377
	378	if (check_zero && !x)
	379	return -EINVAL;
	380
	381	spin_lock(&gt->gt_spin);
	382	*field = x;
	383	spin_unlock(&gt->gt_spin);
	384	return len;
	385	}
	386
	387	struct tune_attr {
	388	struct attribute attr;
	389	ssize_t (show)(struct gfs2_sbd , char *);
	390	ssize_t (store)(struct gfs2_sbd , const char *, size_t);
	391	};
	392
	393	#define TUNE_ATTR_3(name, show, store) \
	394	static struct tune_attr tune_attr_##name = __ATTR(name, 0644, show, store)
	395
	396	#define TUNE_ATTR_2(name, store) \
	397	static ssize_t name##_show(struct gfs2_sbd sdp, char buf) \
	398	{ \
3204a6c0	399	return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name); \
b3b94faa DT	400	} \
	401	TUNE_ATTR_3(name, name##_show, store)
	402
	403	#define TUNE_ATTR(name, check_zero) \
	404	static ssize_t name##_store(struct gfs2_sbd sdp, const char buf, size_t len)\
	405	{ \
	406	return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len); \
	407	} \
	408	TUNE_ATTR_2(name, name##_store)
	409
	410	#define TUNE_ATTR_DAEMON(name, process) \
	411	static ssize_t name##_store(struct gfs2_sbd sdp, const char buf, size_t len)\
	412	{ \
	413	ssize_t r = tune_set(sdp, &sdp->sd_tune.gt_##name, 1, buf, len); \
	414	wake_up_process(sdp->sd_##process); \
	415	return r; \
	416	} \
	417	TUNE_ATTR_2(name, name##_store)
	418
b3b94faa DT	419	TUNE_ATTR(demote_secs, 0);
	420	TUNE_ATTR(incore_log_blocks, 0);
	421	TUNE_ATTR(log_flush_secs, 0);
b3b94faa DT	422	TUNE_ATTR(quota_warn_period, 0);
	423	TUNE_ATTR(quota_quantum, 0);
	424	TUNE_ATTR(atime_quantum, 0);
	425	TUNE_ATTR(max_readahead, 0);
	426	TUNE_ATTR(complain_secs, 0);
b3b94faa DT	427	TUNE_ATTR(statfs_slow, 0);
	428	TUNE_ATTR(new_files_jdata, 0);
	429	TUNE_ATTR(new_files_directio, 0);
	430	TUNE_ATTR(quota_simul_sync, 1);
	431	TUNE_ATTR(quota_cache_secs, 1);
b3b94faa	432	TUNE_ATTR(stall_secs, 1);
b3b94faa	433	TUNE_ATTR(statfs_quantum, 1);
b3b94faa DT	434	TUNE_ATTR_DAEMON(recoverd_secs, recoverd_process);
	435	TUNE_ATTR_DAEMON(logd_secs, logd_process);
	436	TUNE_ATTR_DAEMON(quotad_secs, quotad_process);
b3b94faa DT	437	TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
	438
	439	static struct attribute *tune_attrs[] = {
b3b94faa DT	440	&tune_attr_demote_secs.attr,
	441	&tune_attr_incore_log_blocks.attr,
	442	&tune_attr_log_flush_secs.attr,
b3b94faa DT	443	&tune_attr_quota_warn_period.attr,
	444	&tune_attr_quota_quantum.attr,
	445	&tune_attr_atime_quantum.attr,
	446	&tune_attr_max_readahead.attr,
	447	&tune_attr_complain_secs.attr,
b3b94faa DT	448	&tune_attr_statfs_slow.attr,
	449	&tune_attr_quota_simul_sync.attr,
	450	&tune_attr_quota_cache_secs.attr,
b3b94faa	451	&tune_attr_stall_secs.attr,
b3b94faa	452	&tune_attr_statfs_quantum.attr,
b3b94faa DT	453	&tune_attr_recoverd_secs.attr,
	454	&tune_attr_logd_secs.attr,
	455	&tune_attr_quotad_secs.attr,
b3b94faa DT	456	&tune_attr_quota_scale.attr,
	457	&tune_attr_new_files_jdata.attr,
	458	&tune_attr_new_files_directio.attr,
ea67eedb	459	NULL,
b3b94faa DT	460	};
	461
	462	static struct attribute_group lockstruct_group = {
	463	.name = "lockstruct",
ea67eedb	464	.attrs = lockstruct_attrs,
b3b94faa DT	465	};
	466
	467	static struct attribute_group counters_group = {
	468	.name = "counters",
ea67eedb	469	.attrs = counters_attrs,
b3b94faa DT	470	};
	471
	472	static struct attribute_group args_group = {
	473	.name = "args",
ea67eedb	474	.attrs = args_attrs,
b3b94faa DT	475	};
	476
	477	static struct attribute_group tune_group = {
	478	.name = "tune",
ea67eedb	479	.attrs = tune_attrs,
b3b94faa DT	480	};
	481
	482	int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
	483	{
	484	int error;
	485
9bec101a	486	sdp->sd_kobj.kset = gfs2_kset;
901195ed GKH	487	error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL,
901195ed GKH	488	"%s", sdp->sd_table_name);
b3b94faa DT	489	if (error)
	490	goto fail;
	491
	492	error = sysfs_create_group(&sdp->sd_kobj, &lockstruct_group);
	493	if (error)
	494	goto fail_reg;
	495
	496	error = sysfs_create_group(&sdp->sd_kobj, &counters_group);
	497	if (error)
	498	goto fail_lockstruct;
	499
	500	error = sysfs_create_group(&sdp->sd_kobj, &args_group);
	501	if (error)
	502	goto fail_counters;
	503
	504	error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
	505	if (error)
	506	goto fail_args;
	507
901195ed	508	kobject_uevent(&sdp->sd_kobj, KOBJ_ADD);
b3b94faa DT	509	return 0;
b3b94faa DT	510
a91ea69f	511	fail_args:
b3b94faa	512	sysfs_remove_group(&sdp->sd_kobj, &args_group);
a91ea69f	513	fail_counters:
b3b94faa	514	sysfs_remove_group(&sdp->sd_kobj, &counters_group);
a91ea69f	515	fail_lockstruct:
b3b94faa	516	sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group);
a91ea69f	517	fail_reg:
197b12d6	518	kobject_put(&sdp->sd_kobj);
a91ea69f	519	fail:
65952fb4	520	fs_err(sdp, "error %d adding sysfs files", error);
b3b94faa DT	521	return error;
	522	}
	523
	524	void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
	525	{
	526	sysfs_remove_group(&sdp->sd_kobj, &tune_group);
	527	sysfs_remove_group(&sdp->sd_kobj, &args_group);
	528	sysfs_remove_group(&sdp->sd_kobj, &counters_group);
	529	sysfs_remove_group(&sdp->sd_kobj, &lockstruct_group);
197b12d6	530	kobject_put(&sdp->sd_kobj);
b3b94faa DT	531	}
	532
	533	int gfs2_sys_init(void)
	534	{
	535	gfs2_sys_margs = NULL;
	536	spin_lock_init(&gfs2_sys_margs_lock);
9bec101a GKH	537	gfs2_kset = kset_create_and_add("gfs2", NULL, fs_kobj);
	538	if (!gfs2_kset)
	539	return -ENOMEM;
	540	return 0;
b3b94faa DT	541	}
	542
	543	void gfs2_sys_uninit(void)
	544	{
	545	kfree(gfs2_sys_margs);
9bec101a	546	kset_unregister(gfs2_kset);
b3b94faa DT	547	}
b3b94faa DT	548