fs/gfs2/sys.c - LeafOS-Devices/android_kernel_samsung_gta4xl - Gitiles

 /*
  * 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"

 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 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(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_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(posix_acl,       "%d\n");
 ARGS_ATTR(quota,           "%u\n");
 ARGS_ATTR(suiddir,         "%d\n");
 ARGS_ATTR(data,            "%d\n");

 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_posix_acl.attr,
 	&args_attr_quota.attr,
 	&args_attr_suiddir.attr,
 	&args_attr_data.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(incore_log_blocks, 0);
 TUNE_ATTR(log_flush_secs, 0);
 TUNE_ATTR(quota_warn_period, 0);
 TUNE_ATTR(quota_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(quota_simul_sync, 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_3(quota_scale, quota_scale_show, quota_scale_store);

 static struct attribute *tune_attrs[] = {
 	&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_max_readahead.attr,
 	&tune_attr_complain_secs.attr,
 	&tune_attr_statfs_slow.attr,
 	&tune_attr_quota_simul_sync.attr,
 	&tune_attr_stall_secs.attr,
 	&tune_attr_statfs_quantum.attr,
 	&tune_attr_recoverd_secs.attr,
 	&tune_attr_logd_secs.attr,
 	&tune_attr_quota_scale.attr,
 	&tune_attr_new_files_jdata.attr,
 	NULL,
 };

 static struct attribute_group lockstruct_group = {
 	.name = "lockstruct",
 	.attrs = lockstruct_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, &args_group);
 	if (error)
 		goto fail_lockstruct;

 	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_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, &lockstruct_group);
 	kobject_put(&sdp->sd_kobj);
 }

 static int gfs2_uevent(struct kset *kset, struct kobject *kobj,
 		       struct kobj_uevent_env *env)
 {
 	struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
 	add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name);
 	add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name);
 	return 0;
 }

 static struct kset_uevent_ops gfs2_uevent_ops = {
 	.uevent = gfs2_uevent,
 };


 int gfs2_sys_init(void)
 {
 	gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj);
 	if (!gfs2_kset)
 		return -ENOMEM;
 	return 0;
 }

 void gfs2_sys_uninit(void)
 {
 	kset_unregister(gfs2_kset);
 }
	/*
	* 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"

	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 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(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_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(posix_acl, "%d\n");
	ARGS_ATTR(quota, "%u\n");
	ARGS_ATTR(suiddir, "%d\n");
	ARGS_ATTR(data, "%d\n");

	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_posix_acl.attr,
	&args_attr_quota.attr,
	&args_attr_suiddir.attr,
	&args_attr_data.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(incore_log_blocks, 0);
	TUNE_ATTR(log_flush_secs, 0);
	TUNE_ATTR(quota_warn_period, 0);
	TUNE_ATTR(quota_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(quota_simul_sync, 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_3(quota_scale, quota_scale_show, quota_scale_store);

	static struct attribute *tune_attrs[] = {
	&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_max_readahead.attr,
	&tune_attr_complain_secs.attr,
	&tune_attr_statfs_slow.attr,
	&tune_attr_quota_simul_sync.attr,
	&tune_attr_stall_secs.attr,
	&tune_attr_statfs_quantum.attr,
	&tune_attr_recoverd_secs.attr,
	&tune_attr_logd_secs.attr,
	&tune_attr_quota_scale.attr,
	&tune_attr_new_files_jdata.attr,
	NULL,
	};

	static struct attribute_group lockstruct_group = {
	.name = "lockstruct",
	.attrs = lockstruct_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, &args_group);
	if (error)
	goto fail_lockstruct;

	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_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, &lockstruct_group);
	kobject_put(&sdp->sd_kobj);
	}

	static int gfs2_uevent(struct kset kset, struct kobject kobj,
	struct kobj_uevent_env *env)
	{
	struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
	add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name);
	add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name);
	return 0;
	}

	static struct kset_uevent_ops gfs2_uevent_ops = {
	.uevent = gfs2_uevent,
	};


	int gfs2_sys_init(void)
	{
	gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj);
	if (!gfs2_kset)
	return -ENOMEM;
	return 0;
	}

	void gfs2_sys_uninit(void)
	{
	kset_unregister(gfs2_kset);
	}