[linux-2.6-block.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 <asm/uaccess.h>
#include <linux/gfs2_ondisk.h>
#include <linux/genhd.h>

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

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

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 kset *gfs2_kset;

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 int gfs2_uuid_valid(const u8 *uuid)
{
	int i;

	for (i = 0; i < 16; i++) {
		if (uuid[i])
			return 1;
	}
	return 0;
}

static ssize_t uuid_show(struct gfs2_sbd *sdp, char *buf)
{
	const u8 *uuid = sdp->sd_sb.sb_uuid;
	buf[0] = '\0';
	if (!gfs2_uuid_valid(uuid))
		return 0;
	return snprintf(buf, PAGE_SIZE, "%02X%02X%02X%02X-%02X%02X-"
			"%02X%02X-%02X%02X-%02X%02X%02X%02X%02X%02X\n",
			uuid[0], uuid[1], uuid[2], uuid[3], uuid[4], uuid[5],
			uuid[6], uuid[7], uuid[8], uuid[9], uuid[10], uuid[11],
			uuid[12], uuid[13], uuid[14], uuid[15]);
}

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->sd_vfs, 0);
	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->sd_vfs, 0);
	return len;
}

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

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

	id = simple_strtoul(buf, NULL, 0);

	error = gfs2_quota_refresh(sdp, 1, id);
	return error ? error : len;
}

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

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

	id = simple_strtoul(buf, NULL, 0);

	error = gfs2_quota_refresh(sdp, 0, id);
	return error ? error : len;
}

static ssize_t demote_rq_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
{
	struct gfs2_glock *gl;
	const struct gfs2_glock_operations *glops;
	unsigned int glmode;
	unsigned int gltype;
	unsigned long long glnum;
	char mode[16];
	int rv;

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

	rv = sscanf(buf, "%u:%llu %15s", &gltype, &glnum,
		    mode);
	if (rv != 3)
		return -EINVAL;

	if (strcmp(mode, "EX") == 0)
		glmode = LM_ST_UNLOCKED;
	else if ((strcmp(mode, "CW") == 0) || (strcmp(mode, "DF") == 0))
		glmode = LM_ST_DEFERRED;
	else if ((strcmp(mode, "PR") == 0) || (strcmp(mode, "SH") == 0))
		glmode = LM_ST_SHARED;
	else
		return -EINVAL;

	if (gltype > LM_TYPE_JOURNAL)
		return -EINVAL;
	glops = gfs2_glops_list[gltype];
	if (glops == NULL)
		return -EINVAL;
	rv = gfs2_glock_get(sdp, glnum, glops, 0, &gl);
	if (rv)
		return rv;
	gfs2_glock_cb(gl, glmode);
	gfs2_glock_put(gl);
	return len;
}


#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(uuid,                0444, uuid_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);
GFS2_ATTR(demote_rq,           0200, NULL,	    demote_rq_store);

static struct attribute *gfs2_attrs[] = {
	&gfs2_attr_id.attr,
	&gfs2_attr_fsname.attr,
	&gfs2_attr_uuid.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,
	&gfs2_attr_demote_rq.attr,
	NULL,
};

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


/*
 * lock_module. Originally from lock_dlm
 */

static ssize_t proto_name_show(struct gfs2_sbd *sdp, char *buf)
{
	const struct lm_lockops *ops = sdp->sd_lockstruct.ls_ops;
	return sprintf(buf, "%s\n", ops->lm_proto_name);
}

static ssize_t block_show(struct gfs2_sbd *sdp, char *buf)
{
	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
	ssize_t ret;
	int val = 0;

	if (test_bit(DFL_BLOCK_LOCKS, &ls->ls_flags))
		val = 1;
	ret = sprintf(buf, "%d\n", val);
	return ret;
}

static ssize_t block_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
{
	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
	ssize_t ret = len;
	int val;

	val = simple_strtol(buf, NULL, 0);

	if (val == 1)
		set_bit(DFL_BLOCK_LOCKS, &ls->ls_flags);
	else if (val == 0) {
		clear_bit(DFL_BLOCK_LOCKS, &ls->ls_flags);
		smp_mb__after_clear_bit();
		gfs2_glock_thaw(sdp);
	} else {
		ret = -EINVAL;
	}
	return ret;
}

static ssize_t lkfirst_show(struct gfs2_sbd *sdp, char *buf)
{
	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
	return sprintf(buf, "%d\n", ls->ls_first);
}

static ssize_t first_done_show(struct gfs2_sbd *sdp, char *buf)
{
	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
	return sprintf(buf, "%d\n", ls->ls_first_done);
}

static ssize_t recover_store(struct gfs2_sbd *sdp, const char *buf, size_t len)
{
	unsigned jid;
	struct gfs2_jdesc *jd;
	int rv;

	rv = sscanf(buf, "%u", &jid);
	if (rv != 1)
		return -EINVAL;

	rv = -ESHUTDOWN;
	spin_lock(&sdp->sd_jindex_spin);
	if (test_bit(SDF_NORECOVERY, &sdp->sd_flags))
		goto out;
	rv = -EBUSY;
	if (sdp->sd_jdesc->jd_jid == jid)
		goto out;
	rv = -ENOENT;
	list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
		if (jd->jd_jid != jid)
			continue;
		rv = slow_work_enqueue(&jd->jd_work);
		break;
	}
out:
	spin_unlock(&sdp->sd_jindex_spin);
	return rv ? rv : len;
}

static ssize_t recover_done_show(struct gfs2_sbd *sdp, char *buf)
{
	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
	return sprintf(buf, "%d\n", ls->ls_recover_jid_done);
}

static ssize_t recover_status_show(struct gfs2_sbd *sdp, char *buf)
{
	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
	return sprintf(buf, "%d\n", ls->ls_recover_jid_status);
}

static ssize_t jid_show(struct gfs2_sbd *sdp, char *buf)
{
	return sprintf(buf, "%u\n", sdp->sd_lockstruct.ls_jid);
}

#define GDLM_ATTR(_name,_mode,_show,_store) \
static struct gfs2_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store)

GDLM_ATTR(proto_name,		0444, proto_name_show,		NULL);
GDLM_ATTR(block,		0644, block_show,		block_store);
GDLM_ATTR(withdraw,		0644, withdraw_show,		withdraw_store);
GDLM_ATTR(jid,			0444, jid_show,			NULL);
GDLM_ATTR(first,		0444, lkfirst_show,		NULL);
GDLM_ATTR(first_done,		0444, first_done_show,		NULL);
GDLM_ATTR(recover,		0600, NULL,			recover_store);
GDLM_ATTR(recover_done,		0444, recover_done_show,	NULL);
GDLM_ATTR(recover_status,	0444, recover_status_show,	NULL);

static struct attribute *lock_module_attrs[] = {
	&gdlm_attr_proto_name.attr,
	&gdlm_attr_block.attr,
	&gdlm_attr_withdraw.attr,
	&gdlm_attr_jid.attr,
	&gdlm_attr_first.attr,
	&gdlm_attr_first_done.attr,
	&gdlm_attr_recover.attr,
	&gdlm_attr_recover_done.attr,
	&gdlm_attr_recover_status.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;
}

#define TUNE_ATTR_3(name, show, store)                                        \
static struct gfs2_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)

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_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_quota_scale.attr,
	&tune_attr_new_files_jdata.attr,
	NULL,
};

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

static struct attribute_group lock_module_group = {
	.name = "lock_module",
	.attrs = lock_module_attrs,
};

int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
{
	struct super_block *sb = sdp->sd_vfs;
	int error;
	char ro[20];
	char spectator[20];
	char *envp[] = { ro, spectator, NULL };

	sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0);
	sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);

	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, &tune_group);
	if (error)
		goto fail_reg;

	error = sysfs_create_group(&sdp->sd_kobj, &lock_module_group);
	if (error)
		goto fail_tune;

	error = sysfs_create_link(&sdp->sd_kobj,
				  &disk_to_dev(sb->s_bdev->bd_disk)->kobj,
				  "device");
	if (error)
		goto fail_lock_module;

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

fail_lock_module:
	sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
fail_tune:
	sysfs_remove_group(&sdp->sd_kobj, &tune_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_link(&sdp->sd_kobj, "device");
	sysfs_remove_group(&sdp->sd_kobj, &tune_group);
	sysfs_remove_group(&sdp->sd_kobj, &lock_module_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);
	const u8 *uuid = sdp->sd_sb.sb_uuid;

	add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name);
	add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name);
	if (!sdp->sd_args.ar_spectator)
		add_uevent_var(env, "JOURNALID=%u", sdp->sd_lockstruct.ls_jid);
	if (gfs2_uuid_valid(uuid)) {
		add_uevent_var(env, "UUID=%02X%02X%02X%02X-%02X%02X-%02X%02X-"
			       "%02X%02X-%02X%02X%02X%02X%02X%02X",
			       uuid[0], uuid[1], uuid[2], uuid[3], uuid[4],
			       uuid[5], uuid[6], uuid[7], uuid[8], uuid[9],
			       uuid[10], uuid[11], uuid[12], uuid[13],
			       uuid[14], uuid[15]);
	}
	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);
}
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>
b3b94faa	17	#include <asm/uaccess.h>
f057f6cd	18	#include <linux/gfs2_ondisk.h>
31e54b01	19	#include <linux/genhd.h>
b3b94faa DT	20
b3b94faa DT	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"
64d576ba	28	#include "glops.h"
b3b94faa	29
48c2b613 SW	30	struct gfs2_attr {
	31	struct attribute attr;
	32	ssize_t (show)(struct gfs2_sbd , char *);
	33	ssize_t (store)(struct gfs2_sbd , const char *, size_t);
	34	};
	35
	36	static ssize_t gfs2_attr_show(struct kobject kobj, struct attribute attr,
	37	char *buf)
	38	{
	39	struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
	40	struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
	41	return a->show ? a->show(sdp, buf) : 0;
	42	}
	43
	44	static ssize_t gfs2_attr_store(struct kobject kobj, struct attribute attr,
	45	const char *buf, size_t len)
	46	{
	47	struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
	48	struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
	49	return a->store ? a->store(sdp, buf, len) : len;
	50	}
	51
	52	static struct sysfs_ops gfs2_attr_ops = {
	53	.show = gfs2_attr_show,
	54	.store = gfs2_attr_store,
	55	};
	56
	57
	58	static struct kset *gfs2_kset;
	59
b3b94faa DT	60	static ssize_t id_show(struct gfs2_sbd sdp, char buf)
b3b94faa DT	61	{
c7227e46 BP	62	return snprintf(buf, PAGE_SIZE, "%u:%u\n",
c7227e46 BP	63	MAJOR(sdp->sd_vfs->s_dev), MINOR(sdp->sd_vfs->s_dev));
b3b94faa DT	64	}
	65
	66	static ssize_t fsname_show(struct gfs2_sbd sdp, char buf)
	67	{
3204a6c0	68	return snprintf(buf, PAGE_SIZE, "%s\n", sdp->sd_fsname);
b3b94faa DT	69	}
b3b94faa DT	70
02e3cc70 SW	71	static int gfs2_uuid_valid(const u8 *uuid)
	72	{
	73	int i;
	74
	75	for (i = 0; i < 16; i++) {
	76	if (uuid[i])
	77	return 1;
	78	}
	79	return 0;
	80	}
	81
	82	static ssize_t uuid_show(struct gfs2_sbd sdp, char buf)
	83	{
	84	const u8 *uuid = sdp->sd_sb.sb_uuid;
	85	buf[0] = '\0';
	86	if (!gfs2_uuid_valid(uuid))
	87	return 0;
	88	return snprintf(buf, PAGE_SIZE, "%02X%02X%02X%02X-%02X%02X-"
	89	"%02X%02X-%02X%02X-%02X%02X%02X%02X%02X%02X\n",
	90	uuid[0], uuid[1], uuid[2], uuid[3], uuid[4], uuid[5],
	91	uuid[6], uuid[7], uuid[8], uuid[9], uuid[10], uuid[11],
	92	uuid[12], uuid[13], uuid[14], uuid[15]);
	93	}
	94
b3b94faa DT	95	static ssize_t freeze_show(struct gfs2_sbd sdp, char buf)
	96	{
	97	unsigned int count;
	98
f55ab26a	99	mutex_lock(&sdp->sd_freeze_lock);
b3b94faa	100	count = sdp->sd_freeze_count;
f55ab26a	101	mutex_unlock(&sdp->sd_freeze_lock);
b3b94faa	102
3204a6c0	103	return snprintf(buf, PAGE_SIZE, "%u\n", count);
b3b94faa DT	104	}
	105
	106	static ssize_t freeze_store(struct gfs2_sbd sdp, const char buf, size_t len)
	107	{
	108	ssize_t ret = len;
	109	int error = 0;
	110	int n = simple_strtol(buf, NULL, 0);
	111
	112	if (!capable(CAP_SYS_ADMIN))
	113	return -EACCES;
	114
	115	switch (n) {
	116	case 0:
	117	gfs2_unfreeze_fs(sdp);
	118	break;
	119	case 1:
	120	error = gfs2_freeze_fs(sdp);
	121	break;
	122	default:
	123	ret = -EINVAL;
	124	}
	125
	126	if (error)
	127	fs_warn(sdp, "freeze %d error %d", n, error);
	128
	129	return ret;
	130	}
	131
	132	static ssize_t withdraw_show(struct gfs2_sbd sdp, char buf)
	133	{
	134	unsigned int b = test_bit(SDF_SHUTDOWN, &sdp->sd_flags);
3204a6c0	135	return snprintf(buf, PAGE_SIZE, "%u\n", b);
b3b94faa DT	136	}
	137
	138	static ssize_t withdraw_store(struct gfs2_sbd sdp, const char buf, size_t len)
	139	{
	140	if (!capable(CAP_SYS_ADMIN))
	141	return -EACCES;
	142
	143	if (simple_strtol(buf, NULL, 0) != 1)
	144	return -EINVAL;
	145
	146	gfs2_lm_withdraw(sdp,
	147	"GFS2: fsid=%s: withdrawing from cluster at user's request\n",
	148	sdp->sd_fsname);
	149	return len;
	150	}
	151
	152	static ssize_t statfs_sync_store(struct gfs2_sbd sdp, const char buf,
	153	size_t len)
	154	{
	155	if (!capable(CAP_SYS_ADMIN))
	156	return -EACCES;
	157
	158	if (simple_strtol(buf, NULL, 0) != 1)
	159	return -EINVAL;
	160
8c42d637	161	gfs2_statfs_sync(sdp->sd_vfs, 0);
b3b94faa DT	162	return len;
	163	}
	164
b3b94faa DT	165	static ssize_t quota_sync_store(struct gfs2_sbd sdp, const char buf,
	166	size_t len)
	167	{
	168	if (!capable(CAP_SYS_ADMIN))
	169	return -EACCES;
	170
	171	if (simple_strtol(buf, NULL, 0) != 1)
	172	return -EINVAL;
	173
8c42d637	174	gfs2_quota_sync(sdp->sd_vfs, 0);
b3b94faa DT	175	return len;
	176	}
	177
	178	static ssize_t quota_refresh_user_store(struct gfs2_sbd sdp, const char buf,
	179	size_t len)
	180	{
ea762338	181	int error;
cd915493	182	u32 id;
b3b94faa DT	183
	184	if (!capable(CAP_SYS_ADMIN))
	185	return -EACCES;
	186
	187	id = simple_strtoul(buf, NULL, 0);
	188
ea762338 SW	189	error = gfs2_quota_refresh(sdp, 1, id);
ea762338 SW	190	return error ? error : len;
b3b94faa DT	191	}
	192
	193	static ssize_t quota_refresh_group_store(struct gfs2_sbd sdp, const char buf,
	194	size_t len)
	195	{
ea762338	196	int error;
cd915493	197	u32 id;
b3b94faa DT	198
	199	if (!capable(CAP_SYS_ADMIN))
	200	return -EACCES;
	201
	202	id = simple_strtoul(buf, NULL, 0);
	203
ea762338 SW	204	error = gfs2_quota_refresh(sdp, 0, id);
ea762338 SW	205	return error ? error : len;
b3b94faa DT	206	}
b3b94faa DT	207
64d576ba SW	208	static ssize_t demote_rq_store(struct gfs2_sbd sdp, const char buf, size_t len)
	209	{
	210	struct gfs2_glock *gl;
	211	const struct gfs2_glock_operations *glops;
	212	unsigned int glmode;
	213	unsigned int gltype;
	214	unsigned long long glnum;
	215	char mode[16];
	216	int rv;
	217
	218	if (!capable(CAP_SYS_ADMIN))
	219	return -EACCES;
	220
	221	rv = sscanf(buf, "%u:%llu %15s", &gltype, &glnum,
	222	mode);
	223	if (rv != 3)
	224	return -EINVAL;
	225
	226	if (strcmp(mode, "EX") == 0)
	227	glmode = LM_ST_UNLOCKED;
	228	else if ((strcmp(mode, "CW") == 0) \|\| (strcmp(mode, "DF") == 0))
	229	glmode = LM_ST_DEFERRED;
	230	else if ((strcmp(mode, "PR") == 0) \|\| (strcmp(mode, "SH") == 0))
	231	glmode = LM_ST_SHARED;
	232	else
	233	return -EINVAL;
	234
	235	if (gltype > LM_TYPE_JOURNAL)
	236	return -EINVAL;
	237	glops = gfs2_glops_list[gltype];
	238	if (glops == NULL)
	239	return -EINVAL;
	240	rv = gfs2_glock_get(sdp, glnum, glops, 0, &gl);
	241	if (rv)
	242	return rv;
	243	gfs2_glock_cb(gl, glmode);
	244	gfs2_glock_put(gl);
	245	return len;
	246	}
	247
b3b94faa DT	248
	249	#define GFS2_ATTR(name, mode, show, store) \
	250	static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store)
	251
	252	GFS2_ATTR(id, 0444, id_show, NULL);
	253	GFS2_ATTR(fsname, 0444, fsname_show, NULL);
02e3cc70	254	GFS2_ATTR(uuid, 0444, uuid_show, NULL);
b3b94faa	255	GFS2_ATTR(freeze, 0644, freeze_show, freeze_store);
b3b94faa DT	256	GFS2_ATTR(withdraw, 0644, withdraw_show, withdraw_store);
	257	GFS2_ATTR(statfs_sync, 0200, NULL, statfs_sync_store);
	258	GFS2_ATTR(quota_sync, 0200, NULL, quota_sync_store);
	259	GFS2_ATTR(quota_refresh_user, 0200, NULL, quota_refresh_user_store);
	260	GFS2_ATTR(quota_refresh_group, 0200, NULL, quota_refresh_group_store);
64d576ba	261	GFS2_ATTR(demote_rq, 0200, NULL, demote_rq_store);
b3b94faa DT	262
	263	static struct attribute *gfs2_attrs[] = {
	264	&gfs2_attr_id.attr,
	265	&gfs2_attr_fsname.attr,
02e3cc70	266	&gfs2_attr_uuid.attr,
b3b94faa	267	&gfs2_attr_freeze.attr,
b3b94faa DT	268	&gfs2_attr_withdraw.attr,
	269	&gfs2_attr_statfs_sync.attr,
	270	&gfs2_attr_quota_sync.attr,
	271	&gfs2_attr_quota_refresh_user.attr,
	272	&gfs2_attr_quota_refresh_group.attr,
64d576ba	273	&gfs2_attr_demote_rq.attr,
b3b94faa DT	274	NULL,
	275	};
	276
b3b94faa DT	277	static struct kobj_type gfs2_ktype = {
	278	.default_attrs = gfs2_attrs,
	279	.sysfs_ops = &gfs2_attr_ops,
	280	};
	281
f057f6cd SW	282
	283	/*
	284	* lock_module. Originally from lock_dlm
	285	*/
	286
	287	static ssize_t proto_name_show(struct gfs2_sbd sdp, char buf)
	288	{
	289	const struct lm_lockops *ops = sdp->sd_lockstruct.ls_ops;
	290	return sprintf(buf, "%s\n", ops->lm_proto_name);
	291	}
	292
	293	static ssize_t block_show(struct gfs2_sbd sdp, char buf)
	294	{
	295	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
	296	ssize_t ret;
	297	int val = 0;
	298
	299	if (test_bit(DFL_BLOCK_LOCKS, &ls->ls_flags))
	300	val = 1;
	301	ret = sprintf(buf, "%d\n", val);
	302	return ret;
	303	}
	304
	305	static ssize_t block_store(struct gfs2_sbd sdp, const char buf, size_t len)
	306	{
	307	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
	308	ssize_t ret = len;
	309	int val;
	310
	311	val = simple_strtol(buf, NULL, 0);
	312
	313	if (val == 1)
	314	set_bit(DFL_BLOCK_LOCKS, &ls->ls_flags);
	315	else if (val == 0) {
	316	clear_bit(DFL_BLOCK_LOCKS, &ls->ls_flags);
	317	smp_mb__after_clear_bit();
	318	gfs2_glock_thaw(sdp);
	319	} else {
	320	ret = -EINVAL;
	321	}
	322	return ret;
	323	}
	324
f057f6cd SW	325	static ssize_t lkfirst_show(struct gfs2_sbd sdp, char buf)
	326	{
	327	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
	328	return sprintf(buf, "%d\n", ls->ls_first);
	329	}
	330
	331	static ssize_t first_done_show(struct gfs2_sbd sdp, char buf)
	332	{
	333	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
	334	return sprintf(buf, "%d\n", ls->ls_first_done);
	335	}
	336
fe64d517	337	static ssize_t recover_store(struct gfs2_sbd sdp, const char buf, size_t len)
f057f6cd	338	{
fe64d517	339	unsigned jid;
f057f6cd	340	struct gfs2_jdesc *jd;
fe64d517 SW	341	int rv;
	342
	343	rv = sscanf(buf, "%u", &jid);
	344	if (rv != 1)
	345	return -EINVAL;
f057f6cd	346
fe64d517	347	rv = -ESHUTDOWN;
f057f6cd	348	spin_lock(&sdp->sd_jindex_spin);
fe64d517 SW	349	if (test_bit(SDF_NORECOVERY, &sdp->sd_flags))
	350	goto out;
	351	rv = -EBUSY;
	352	if (sdp->sd_jdesc->jd_jid == jid)
	353	goto out;
	354	rv = -ENOENT;
f057f6cd SW	355	list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
	356	if (jd->jd_jid != jid)
	357	continue;
fe64d517	358	rv = slow_work_enqueue(&jd->jd_work);
f057f6cd SW	359	break;
f057f6cd SW	360	}
fe64d517	361	out:
f057f6cd	362	spin_unlock(&sdp->sd_jindex_spin);
fe64d517	363	return rv ? rv : len;
f057f6cd SW	364	}
	365
	366	static ssize_t recover_done_show(struct gfs2_sbd sdp, char buf)
	367	{
	368	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
	369	return sprintf(buf, "%d\n", ls->ls_recover_jid_done);
	370	}
	371
	372	static ssize_t recover_status_show(struct gfs2_sbd sdp, char buf)
	373	{
	374	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
	375	return sprintf(buf, "%d\n", ls->ls_recover_jid_status);
	376	}
	377
e1b28aab SW	378	static ssize_t jid_show(struct gfs2_sbd sdp, char buf)
	379	{
	380	return sprintf(buf, "%u\n", sdp->sd_lockstruct.ls_jid);
	381	}
	382
f057f6cd	383	#define GDLM_ATTR(_name,_mode,_show,_store) \
48c2b613	384	static struct gfs2_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store)
f057f6cd	385
d7e623da SW	386	GDLM_ATTR(proto_name, 0444, proto_name_show, NULL);
	387	GDLM_ATTR(block, 0644, block_show, block_store);
	388	GDLM_ATTR(withdraw, 0644, withdraw_show, withdraw_store);
d7e623da SW	389	GDLM_ATTR(jid, 0444, jid_show, NULL);
	390	GDLM_ATTR(first, 0444, lkfirst_show, NULL);
	391	GDLM_ATTR(first_done, 0444, first_done_show, NULL);
	392	GDLM_ATTR(recover, 0600, NULL, recover_store);
	393	GDLM_ATTR(recover_done, 0444, recover_done_show, NULL);
	394	GDLM_ATTR(recover_status, 0444, recover_status_show, NULL);
f057f6cd SW	395
	396	static struct attribute *lock_module_attrs[] = {
	397	&gdlm_attr_proto_name.attr,
	398	&gdlm_attr_block.attr,
	399	&gdlm_attr_withdraw.attr,
e1b28aab	400	&gdlm_attr_jid.attr,
f057f6cd SW	401	&gdlm_attr_first.attr,
	402	&gdlm_attr_first_done.attr,
	403	&gdlm_attr_recover.attr,
	404	&gdlm_attr_recover_done.attr,
	405	&gdlm_attr_recover_status.attr,
ea67eedb	406	NULL,
b3b94faa DT	407	};
b3b94faa DT	408
b3b94faa DT	409	/*
	410	* get and set struct gfs2_tune fields
	411	*/
	412
	413	static ssize_t quota_scale_show(struct gfs2_sbd sdp, char buf)
	414	{
3204a6c0 DT	415	return snprintf(buf, PAGE_SIZE, "%u %u\n",
	416	sdp->sd_tune.gt_quota_scale_num,
	417	sdp->sd_tune.gt_quota_scale_den);
b3b94faa DT	418	}
	419
	420	static ssize_t quota_scale_store(struct gfs2_sbd sdp, const char buf,
	421	size_t len)
	422	{
	423	struct gfs2_tune *gt = &sdp->sd_tune;
	424	unsigned int x, y;
	425
	426	if (!capable(CAP_SYS_ADMIN))
	427	return -EACCES;
	428
	429	if (sscanf(buf, "%u %u", &x, &y) != 2 \|\| !y)
	430	return -EINVAL;
	431
	432	spin_lock(&gt->gt_spin);
	433	gt->gt_quota_scale_num = x;
	434	gt->gt_quota_scale_den = y;
	435	spin_unlock(&gt->gt_spin);
	436	return len;
	437	}
	438
	439	static ssize_t tune_set(struct gfs2_sbd sdp, unsigned int field,
	440	int check_zero, const char *buf, size_t len)
	441	{
	442	struct gfs2_tune *gt = &sdp->sd_tune;
	443	unsigned int x;
	444
	445	if (!capable(CAP_SYS_ADMIN))
	446	return -EACCES;
	447
	448	x = simple_strtoul(buf, NULL, 0);
	449
	450	if (check_zero && !x)
	451	return -EINVAL;
	452
	453	spin_lock(&gt->gt_spin);
	454	*field = x;
	455	spin_unlock(&gt->gt_spin);
	456	return len;
	457	}
	458
b3b94faa	459	#define TUNE_ATTR_3(name, show, store) \
48c2b613	460	static struct gfs2_attr tune_attr_##name = __ATTR(name, 0644, show, store)
b3b94faa DT	461
	462	#define TUNE_ATTR_2(name, store) \
	463	static ssize_t name##_show(struct gfs2_sbd sdp, char buf) \
	464	{ \
3204a6c0	465	return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name); \
b3b94faa DT	466	} \
	467	TUNE_ATTR_3(name, name##_show, store)
	468
	469	#define TUNE_ATTR(name, check_zero) \
	470	static ssize_t name##_store(struct gfs2_sbd sdp, const char buf, size_t len)\
	471	{ \
	472	return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len); \
	473	} \
	474	TUNE_ATTR_2(name, name##_store)
	475
b3b94faa DT	476	TUNE_ATTR(incore_log_blocks, 0);
b3b94faa DT	477	TUNE_ATTR(log_flush_secs, 0);
b3b94faa DT	478	TUNE_ATTR(quota_warn_period, 0);
b3b94faa DT	479	TUNE_ATTR(quota_quantum, 0);
b3b94faa DT	480	TUNE_ATTR(max_readahead, 0);
b3b94faa DT	481	TUNE_ATTR(complain_secs, 0);
b3b94faa DT	482	TUNE_ATTR(statfs_slow, 0);
b3b94faa DT	483	TUNE_ATTR(new_files_jdata, 0);
b3b94faa	484	TUNE_ATTR(quota_simul_sync, 1);
b3b94faa	485	TUNE_ATTR(stall_secs, 1);
b3b94faa	486	TUNE_ATTR(statfs_quantum, 1);
b3b94faa DT	487	TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
	488
	489	static struct attribute *tune_attrs[] = {
b3b94faa DT	490	&tune_attr_incore_log_blocks.attr,
b3b94faa DT	491	&tune_attr_log_flush_secs.attr,
b3b94faa DT	492	&tune_attr_quota_warn_period.attr,
b3b94faa DT	493	&tune_attr_quota_quantum.attr,
b3b94faa DT	494	&tune_attr_max_readahead.attr,
b3b94faa DT	495	&tune_attr_complain_secs.attr,
b3b94faa DT	496	&tune_attr_statfs_slow.attr,
b3b94faa DT	497	&tune_attr_quota_simul_sync.attr,
b3b94faa	498	&tune_attr_stall_secs.attr,
b3b94faa	499	&tune_attr_statfs_quantum.attr,
b3b94faa DT	500	&tune_attr_quota_scale.attr,
b3b94faa DT	501	&tune_attr_new_files_jdata.attr,
ea67eedb	502	NULL,
b3b94faa DT	503	};
b3b94faa DT	504
b3b94faa DT	505	static struct attribute_group tune_group = {
b3b94faa DT	506	.name = "tune",
ea67eedb	507	.attrs = tune_attrs,
b3b94faa DT	508	};
b3b94faa DT	509
f057f6cd SW	510	static struct attribute_group lock_module_group = {
	511	.name = "lock_module",
	512	.attrs = lock_module_attrs,
	513	};
	514
b3b94faa DT	515	int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
b3b94faa DT	516	{
440d6da2	517	struct super_block *sb = sdp->sd_vfs;
b3b94faa	518	int error;
440d6da2 SW	519	char ro[20];
	520	char spectator[20];
	521	char *envp[] = { ro, spectator, NULL };
	522
	523	sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0);
	524	sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
b3b94faa	525
9bec101a	526	sdp->sd_kobj.kset = gfs2_kset;
901195ed GKH	527	error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL,
901195ed GKH	528	"%s", sdp->sd_table_name);
b3b94faa DT	529	if (error)
	530	goto fail;
	531
b3b94faa DT	532	error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
b3b94faa DT	533	if (error)
f6eb5349	534	goto fail_reg;
b3b94faa	535
f057f6cd SW	536	error = sysfs_create_group(&sdp->sd_kobj, &lock_module_group);
	537	if (error)
	538	goto fail_tune;
	539
31e54b01 SW	540	error = sysfs_create_link(&sdp->sd_kobj,
	541	&disk_to_dev(sb->s_bdev->bd_disk)->kobj,
	542	"device");
	543	if (error)
	544	goto fail_lock_module;
	545
440d6da2	546	kobject_uevent_env(&sdp->sd_kobj, KOBJ_ADD, envp);
b3b94faa DT	547	return 0;
b3b94faa DT	548
31e54b01 SW	549	fail_lock_module:
31e54b01 SW	550	sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
f057f6cd SW	551	fail_tune:
f057f6cd SW	552	sysfs_remove_group(&sdp->sd_kobj, &tune_group);
a91ea69f	553	fail_reg:
197b12d6	554	kobject_put(&sdp->sd_kobj);
a91ea69f	555	fail:
65952fb4	556	fs_err(sdp, "error %d adding sysfs files", error);
b3b94faa DT	557	return error;
	558	}
	559
	560	void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
	561	{
31e54b01	562	sysfs_remove_link(&sdp->sd_kobj, "device");
b3b94faa	563	sysfs_remove_group(&sdp->sd_kobj, &tune_group);
f057f6cd	564	sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
197b12d6	565	kobject_put(&sdp->sd_kobj);
b3b94faa DT	566	}
b3b94faa DT	567
fdd1062e SW	568	static int gfs2_uevent(struct kset kset, struct kobject kobj,
	569	struct kobj_uevent_env *env)
	570	{
	571	struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
02e3cc70 SW	572	const u8 *uuid = sdp->sd_sb.sb_uuid;
02e3cc70 SW	573
fdd1062e SW	574	add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name);
fdd1062e SW	575	add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name);
440d6da2 SW	576	if (!sdp->sd_args.ar_spectator)
440d6da2 SW	577	add_uevent_var(env, "JOURNALID=%u", sdp->sd_lockstruct.ls_jid);
02e3cc70 SW	578	if (gfs2_uuid_valid(uuid)) {
	579	add_uevent_var(env, "UUID=%02X%02X%02X%02X-%02X%02X-%02X%02X-"
	580	"%02X%02X-%02X%02X%02X%02X%02X%02X",
	581	uuid[0], uuid[1], uuid[2], uuid[3], uuid[4],
	582	uuid[5], uuid[6], uuid[7], uuid[8], uuid[9],
	583	uuid[10], uuid[11], uuid[12], uuid[13],
	584	uuid[14], uuid[15]);
	585	}
fdd1062e SW	586	return 0;
	587	}
	588
	589	static struct kset_uevent_ops gfs2_uevent_ops = {
	590	.uevent = gfs2_uevent,
	591	};
	592
b3b94faa DT	593	int gfs2_sys_init(void)
b3b94faa DT	594	{
fdd1062e	595	gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj);
9bec101a GKH	596	if (!gfs2_kset)
	597	return -ENOMEM;
	598	return 0;
b3b94faa DT	599	}
	600
	601	void gfs2_sys_uninit(void)
	602	{
9bec101a	603	kset_unregister(gfs2_kset);
b3b94faa DT	604	}
b3b94faa DT	605