[deliverable/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 <asm/uaccess.h>
#include <linux/gfs2_ondisk.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);
	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;
}

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 lkid_show(struct gfs2_sbd *sdp, char *buf)
{
	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
	return sprintf(buf, "%u\n", ls->ls_id);
}

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(id,             0444, lkid_show,		NULL);
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,        0200, 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_id.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)
{
	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, &tune_group);
	if (error)
		goto fail_reg;

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

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

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_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 (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>
b3b94faa DT	19
b3b94faa DT	20	#include "gfs2.h"
5c676f6d	21	#include "incore.h"
b3b94faa DT	22	#include "sys.h"
	23	#include "super.h"
	24	#include "glock.h"
	25	#include "quota.h"
5c676f6d	26	#include "util.h"
64d576ba	27	#include "glops.h"
b3b94faa	28
48c2b613 SW	29	struct gfs2_attr {
	30	struct attribute attr;
	31	ssize_t (show)(struct gfs2_sbd , char *);
	32	ssize_t (store)(struct gfs2_sbd , const char *, size_t);
	33	};
	34
	35	static ssize_t gfs2_attr_show(struct kobject kobj, struct attribute attr,
	36	char *buf)
	37	{
	38	struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
	39	struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
	40	return a->show ? a->show(sdp, buf) : 0;
	41	}
	42
	43	static ssize_t gfs2_attr_store(struct kobject kobj, struct attribute attr,
	44	const char *buf, size_t len)
	45	{
	46	struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
	47	struct gfs2_attr *a = container_of(attr, struct gfs2_attr, attr);
	48	return a->store ? a->store(sdp, buf, len) : len;
	49	}
	50
	51	static struct sysfs_ops gfs2_attr_ops = {
	52	.show = gfs2_attr_show,
	53	.store = gfs2_attr_store,
	54	};
	55
	56
	57	static struct kset *gfs2_kset;
	58
b3b94faa DT	59	static ssize_t id_show(struct gfs2_sbd sdp, char buf)
b3b94faa DT	60	{
c7227e46 BP	61	return snprintf(buf, PAGE_SIZE, "%u:%u\n",
c7227e46 BP	62	MAJOR(sdp->sd_vfs->s_dev), MINOR(sdp->sd_vfs->s_dev));
b3b94faa DT	63	}
	64
	65	static ssize_t fsname_show(struct gfs2_sbd sdp, char buf)
	66	{
3204a6c0	67	return snprintf(buf, PAGE_SIZE, "%s\n", sdp->sd_fsname);
b3b94faa DT	68	}
b3b94faa DT	69
02e3cc70 SW	70	static int gfs2_uuid_valid(const u8 *uuid)
	71	{
	72	int i;
	73
	74	for (i = 0; i < 16; i++) {
	75	if (uuid[i])
	76	return 1;
	77	}
	78	return 0;
	79	}
	80
	81	static ssize_t uuid_show(struct gfs2_sbd sdp, char buf)
	82	{
	83	const u8 *uuid = sdp->sd_sb.sb_uuid;
	84	buf[0] = '\0';
	85	if (!gfs2_uuid_valid(uuid))
	86	return 0;
	87	return snprintf(buf, PAGE_SIZE, "%02X%02X%02X%02X-%02X%02X-"
	88	"%02X%02X-%02X%02X-%02X%02X%02X%02X%02X%02X\n",
	89	uuid[0], uuid[1], uuid[2], uuid[3], uuid[4], uuid[5],
	90	uuid[6], uuid[7], uuid[8], uuid[9], uuid[10], uuid[11],
	91	uuid[12], uuid[13], uuid[14], uuid[15]);
	92	}
	93
b3b94faa DT	94	static ssize_t freeze_show(struct gfs2_sbd sdp, char buf)
	95	{
	96	unsigned int count;
	97
f55ab26a	98	mutex_lock(&sdp->sd_freeze_lock);
b3b94faa	99	count = sdp->sd_freeze_count;
f55ab26a	100	mutex_unlock(&sdp->sd_freeze_lock);
b3b94faa	101
3204a6c0	102	return snprintf(buf, PAGE_SIZE, "%u\n", count);
b3b94faa DT	103	}
	104
	105	static ssize_t freeze_store(struct gfs2_sbd sdp, const char buf, size_t len)
	106	{
	107	ssize_t ret = len;
	108	int error = 0;
	109	int n = simple_strtol(buf, NULL, 0);
	110
	111	if (!capable(CAP_SYS_ADMIN))
	112	return -EACCES;
	113
	114	switch (n) {
	115	case 0:
	116	gfs2_unfreeze_fs(sdp);
	117	break;
	118	case 1:
	119	error = gfs2_freeze_fs(sdp);
	120	break;
	121	default:
	122	ret = -EINVAL;
	123	}
	124
	125	if (error)
	126	fs_warn(sdp, "freeze %d error %d", n, error);
	127
	128	return ret;
	129	}
	130
	131	static ssize_t withdraw_show(struct gfs2_sbd sdp, char buf)
	132	{
	133	unsigned int b = test_bit(SDF_SHUTDOWN, &sdp->sd_flags);
3204a6c0	134	return snprintf(buf, PAGE_SIZE, "%u\n", b);
b3b94faa DT	135	}
	136
	137	static ssize_t withdraw_store(struct gfs2_sbd sdp, const char buf, size_t len)
	138	{
	139	if (!capable(CAP_SYS_ADMIN))
	140	return -EACCES;
	141
	142	if (simple_strtol(buf, NULL, 0) != 1)
	143	return -EINVAL;
	144
	145	gfs2_lm_withdraw(sdp,
	146	"GFS2: fsid=%s: withdrawing from cluster at user's request\n",
	147	sdp->sd_fsname);
	148	return len;
	149	}
	150
	151	static ssize_t statfs_sync_store(struct gfs2_sbd sdp, const char buf,
	152	size_t len)
	153	{
	154	if (!capable(CAP_SYS_ADMIN))
	155	return -EACCES;
	156
	157	if (simple_strtol(buf, NULL, 0) != 1)
	158	return -EINVAL;
	159
	160	gfs2_statfs_sync(sdp);
	161	return len;
	162	}
	163
b3b94faa DT	164	static ssize_t quota_sync_store(struct gfs2_sbd sdp, const char buf,
	165	size_t len)
	166	{
	167	if (!capable(CAP_SYS_ADMIN))
	168	return -EACCES;
	169
	170	if (simple_strtol(buf, NULL, 0) != 1)
	171	return -EINVAL;
	172
	173	gfs2_quota_sync(sdp);
	174	return len;
	175	}
	176
	177	static ssize_t quota_refresh_user_store(struct gfs2_sbd sdp, const char buf,
	178	size_t len)
	179	{
cd915493	180	u32 id;
b3b94faa DT	181
	182	if (!capable(CAP_SYS_ADMIN))
	183	return -EACCES;
	184
	185	id = simple_strtoul(buf, NULL, 0);
	186
	187	gfs2_quota_refresh(sdp, 1, id);
	188	return len;
	189	}
	190
	191	static ssize_t quota_refresh_group_store(struct gfs2_sbd sdp, const char buf,
	192	size_t len)
	193	{
cd915493	194	u32 id;
b3b94faa DT	195
	196	if (!capable(CAP_SYS_ADMIN))
	197	return -EACCES;
	198
	199	id = simple_strtoul(buf, NULL, 0);
	200
	201	gfs2_quota_refresh(sdp, 0, id);
	202	return len;
	203	}
	204
64d576ba SW	205	static ssize_t demote_rq_store(struct gfs2_sbd sdp, const char buf, size_t len)
	206	{
	207	struct gfs2_glock *gl;
	208	const struct gfs2_glock_operations *glops;
	209	unsigned int glmode;
	210	unsigned int gltype;
	211	unsigned long long glnum;
	212	char mode[16];
	213	int rv;
	214
	215	if (!capable(CAP_SYS_ADMIN))
	216	return -EACCES;
	217
	218	rv = sscanf(buf, "%u:%llu %15s", &gltype, &glnum,
	219	mode);
	220	if (rv != 3)
	221	return -EINVAL;
	222
	223	if (strcmp(mode, "EX") == 0)
	224	glmode = LM_ST_UNLOCKED;
	225	else if ((strcmp(mode, "CW") == 0) \|\| (strcmp(mode, "DF") == 0))
	226	glmode = LM_ST_DEFERRED;
	227	else if ((strcmp(mode, "PR") == 0) \|\| (strcmp(mode, "SH") == 0))
	228	glmode = LM_ST_SHARED;
	229	else
	230	return -EINVAL;
	231
	232	if (gltype > LM_TYPE_JOURNAL)
	233	return -EINVAL;
	234	glops = gfs2_glops_list[gltype];
	235	if (glops == NULL)
	236	return -EINVAL;
	237	rv = gfs2_glock_get(sdp, glnum, glops, 0, &gl);
	238	if (rv)
	239	return rv;
	240	gfs2_glock_cb(gl, glmode);
	241	gfs2_glock_put(gl);
	242	return len;
	243	}
	244
b3b94faa DT	245
	246	#define GFS2_ATTR(name, mode, show, store) \
	247	static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store)
	248
	249	GFS2_ATTR(id, 0444, id_show, NULL);
	250	GFS2_ATTR(fsname, 0444, fsname_show, NULL);
02e3cc70	251	GFS2_ATTR(uuid, 0444, uuid_show, NULL);
b3b94faa	252	GFS2_ATTR(freeze, 0644, freeze_show, freeze_store);
b3b94faa DT	253	GFS2_ATTR(withdraw, 0644, withdraw_show, withdraw_store);
	254	GFS2_ATTR(statfs_sync, 0200, NULL, statfs_sync_store);
	255	GFS2_ATTR(quota_sync, 0200, NULL, quota_sync_store);
	256	GFS2_ATTR(quota_refresh_user, 0200, NULL, quota_refresh_user_store);
	257	GFS2_ATTR(quota_refresh_group, 0200, NULL, quota_refresh_group_store);
64d576ba	258	GFS2_ATTR(demote_rq, 0200, NULL, demote_rq_store);
b3b94faa DT	259
	260	static struct attribute *gfs2_attrs[] = {
	261	&gfs2_attr_id.attr,
	262	&gfs2_attr_fsname.attr,
02e3cc70	263	&gfs2_attr_uuid.attr,
b3b94faa	264	&gfs2_attr_freeze.attr,
b3b94faa DT	265	&gfs2_attr_withdraw.attr,
	266	&gfs2_attr_statfs_sync.attr,
	267	&gfs2_attr_quota_sync.attr,
	268	&gfs2_attr_quota_refresh_user.attr,
	269	&gfs2_attr_quota_refresh_group.attr,
64d576ba	270	&gfs2_attr_demote_rq.attr,
b3b94faa DT	271	NULL,
	272	};
	273
b3b94faa DT	274	static struct kobj_type gfs2_ktype = {
	275	.default_attrs = gfs2_attrs,
	276	.sysfs_ops = &gfs2_attr_ops,
	277	};
	278
f057f6cd SW	279
	280	/*
	281	* lock_module. Originally from lock_dlm
	282	*/
	283
	284	static ssize_t proto_name_show(struct gfs2_sbd sdp, char buf)
	285	{
	286	const struct lm_lockops *ops = sdp->sd_lockstruct.ls_ops;
	287	return sprintf(buf, "%s\n", ops->lm_proto_name);
	288	}
	289
	290	static ssize_t block_show(struct gfs2_sbd sdp, char buf)
	291	{
	292	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
	293	ssize_t ret;
	294	int val = 0;
	295
	296	if (test_bit(DFL_BLOCK_LOCKS, &ls->ls_flags))
	297	val = 1;
	298	ret = sprintf(buf, "%d\n", val);
	299	return ret;
	300	}
	301
	302	static ssize_t block_store(struct gfs2_sbd sdp, const char buf, size_t len)
	303	{
	304	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
	305	ssize_t ret = len;
	306	int val;
	307
	308	val = simple_strtol(buf, NULL, 0);
	309
	310	if (val == 1)
	311	set_bit(DFL_BLOCK_LOCKS, &ls->ls_flags);
	312	else if (val == 0) {
	313	clear_bit(DFL_BLOCK_LOCKS, &ls->ls_flags);
	314	smp_mb__after_clear_bit();
	315	gfs2_glock_thaw(sdp);
	316	} else {
	317	ret = -EINVAL;
	318	}
	319	return ret;
	320	}
	321
	322	static ssize_t lkid_show(struct gfs2_sbd sdp, char buf)
	323	{
	324	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
	325	return sprintf(buf, "%u\n", ls->ls_id);
	326	}
	327
	328	static ssize_t lkfirst_show(struct gfs2_sbd sdp, char buf)
	329	{
	330	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
	331	return sprintf(buf, "%d\n", ls->ls_first);
	332	}
	333
	334	static ssize_t first_done_show(struct gfs2_sbd sdp, char buf)
	335	{
	336	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
	337	return sprintf(buf, "%d\n", ls->ls_first_done);
	338	}
	339
fe64d517	340	static ssize_t recover_store(struct gfs2_sbd sdp, const char buf, size_t len)
f057f6cd	341	{
fe64d517	342	unsigned jid;
f057f6cd	343	struct gfs2_jdesc *jd;
fe64d517 SW	344	int rv;
	345
	346	rv = sscanf(buf, "%u", &jid);
	347	if (rv != 1)
	348	return -EINVAL;
f057f6cd	349
fe64d517	350	rv = -ESHUTDOWN;
f057f6cd	351	spin_lock(&sdp->sd_jindex_spin);
fe64d517 SW	352	if (test_bit(SDF_NORECOVERY, &sdp->sd_flags))
	353	goto out;
	354	rv = -EBUSY;
	355	if (sdp->sd_jdesc->jd_jid == jid)
	356	goto out;
	357	rv = -ENOENT;
f057f6cd SW	358	list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
	359	if (jd->jd_jid != jid)
	360	continue;
fe64d517	361	rv = slow_work_enqueue(&jd->jd_work);
f057f6cd SW	362	break;
f057f6cd SW	363	}
fe64d517	364	out:
f057f6cd	365	spin_unlock(&sdp->sd_jindex_spin);
fe64d517	366	return rv ? rv : len;
f057f6cd SW	367	}
	368
	369	static ssize_t recover_done_show(struct gfs2_sbd sdp, char buf)
	370	{
	371	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
	372	return sprintf(buf, "%d\n", ls->ls_recover_jid_done);
	373	}
	374
	375	static ssize_t recover_status_show(struct gfs2_sbd sdp, char buf)
	376	{
	377	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
	378	return sprintf(buf, "%d\n", ls->ls_recover_jid_status);
	379	}
	380
e1b28aab SW	381	static ssize_t jid_show(struct gfs2_sbd sdp, char buf)
	382	{
	383	return sprintf(buf, "%u\n", sdp->sd_lockstruct.ls_jid);
	384	}
	385
f057f6cd	386	#define GDLM_ATTR(_name,_mode,_show,_store) \
48c2b613	387	static struct gfs2_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store)
f057f6cd	388
fe64d517 SW	389	GDLM_ATTR(proto_name, 0444, proto_name_show, NULL);
	390	GDLM_ATTR(block, 0644, block_show, block_store);
	391	GDLM_ATTR(withdraw, 0644, withdraw_show, withdraw_store);
	392	GDLM_ATTR(id, 0444, lkid_show, NULL);
e1b28aab	393	GDLM_ATTR(jid, 0444, jid_show, NULL);
fe64d517 SW	394	GDLM_ATTR(first, 0444, lkfirst_show, NULL);
	395	GDLM_ATTR(first_done, 0444, first_done_show, NULL);
	396	GDLM_ATTR(recover, 0200, NULL, recover_store);
	397	GDLM_ATTR(recover_done, 0444, recover_done_show, NULL);
	398	GDLM_ATTR(recover_status, 0444, recover_status_show, NULL);
f057f6cd SW	399
	400	static struct attribute *lock_module_attrs[] = {
	401	&gdlm_attr_proto_name.attr,
	402	&gdlm_attr_block.attr,
	403	&gdlm_attr_withdraw.attr,
	404	&gdlm_attr_id.attr,
e1b28aab	405	&gdlm_attr_jid.attr,
f057f6cd SW	406	&gdlm_attr_first.attr,
	407	&gdlm_attr_first_done.attr,
	408	&gdlm_attr_recover.attr,
	409	&gdlm_attr_recover_done.attr,
	410	&gdlm_attr_recover_status.attr,
ea67eedb	411	NULL,
b3b94faa DT	412	};
b3b94faa DT	413
b3b94faa DT	414	/*
	415	* get and set struct gfs2_tune fields
	416	*/
	417
	418	static ssize_t quota_scale_show(struct gfs2_sbd sdp, char buf)
	419	{
3204a6c0 DT	420	return snprintf(buf, PAGE_SIZE, "%u %u\n",
	421	sdp->sd_tune.gt_quota_scale_num,
	422	sdp->sd_tune.gt_quota_scale_den);
b3b94faa DT	423	}
	424
	425	static ssize_t quota_scale_store(struct gfs2_sbd sdp, const char buf,
	426	size_t len)
	427	{
	428	struct gfs2_tune *gt = &sdp->sd_tune;
	429	unsigned int x, y;
	430
	431	if (!capable(CAP_SYS_ADMIN))
	432	return -EACCES;
	433
	434	if (sscanf(buf, "%u %u", &x, &y) != 2 \|\| !y)
	435	return -EINVAL;
	436
	437	spin_lock(&gt->gt_spin);
	438	gt->gt_quota_scale_num = x;
	439	gt->gt_quota_scale_den = y;
	440	spin_unlock(&gt->gt_spin);
	441	return len;
	442	}
	443
	444	static ssize_t tune_set(struct gfs2_sbd sdp, unsigned int field,
	445	int check_zero, const char *buf, size_t len)
	446	{
	447	struct gfs2_tune *gt = &sdp->sd_tune;
	448	unsigned int x;
	449
	450	if (!capable(CAP_SYS_ADMIN))
	451	return -EACCES;
	452
	453	x = simple_strtoul(buf, NULL, 0);
	454
	455	if (check_zero && !x)
	456	return -EINVAL;
	457
	458	spin_lock(&gt->gt_spin);
	459	*field = x;
	460	spin_unlock(&gt->gt_spin);
	461	return len;
	462	}
	463
b3b94faa	464	#define TUNE_ATTR_3(name, show, store) \
48c2b613	465	static struct gfs2_attr tune_attr_##name = __ATTR(name, 0644, show, store)
b3b94faa DT	466
	467	#define TUNE_ATTR_2(name, store) \
	468	static ssize_t name##_show(struct gfs2_sbd sdp, char buf) \
	469	{ \
3204a6c0	470	return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name); \
b3b94faa DT	471	} \
	472	TUNE_ATTR_3(name, name##_show, store)
	473
	474	#define TUNE_ATTR(name, check_zero) \
	475	static ssize_t name##_store(struct gfs2_sbd sdp, const char buf, size_t len)\
	476	{ \
	477	return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len); \
	478	} \
	479	TUNE_ATTR_2(name, name##_store)
	480
b3b94faa DT	481	TUNE_ATTR(incore_log_blocks, 0);
b3b94faa DT	482	TUNE_ATTR(log_flush_secs, 0);
b3b94faa DT	483	TUNE_ATTR(quota_warn_period, 0);
b3b94faa DT	484	TUNE_ATTR(quota_quantum, 0);
b3b94faa DT	485	TUNE_ATTR(max_readahead, 0);
b3b94faa DT	486	TUNE_ATTR(complain_secs, 0);
b3b94faa DT	487	TUNE_ATTR(statfs_slow, 0);
b3b94faa DT	488	TUNE_ATTR(new_files_jdata, 0);
b3b94faa	489	TUNE_ATTR(quota_simul_sync, 1);
b3b94faa	490	TUNE_ATTR(stall_secs, 1);
b3b94faa	491	TUNE_ATTR(statfs_quantum, 1);
b3b94faa DT	492	TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
	493
	494	static struct attribute *tune_attrs[] = {
b3b94faa DT	495	&tune_attr_incore_log_blocks.attr,
b3b94faa DT	496	&tune_attr_log_flush_secs.attr,
b3b94faa DT	497	&tune_attr_quota_warn_period.attr,
b3b94faa DT	498	&tune_attr_quota_quantum.attr,
b3b94faa DT	499	&tune_attr_max_readahead.attr,
b3b94faa DT	500	&tune_attr_complain_secs.attr,
b3b94faa DT	501	&tune_attr_statfs_slow.attr,
b3b94faa DT	502	&tune_attr_quota_simul_sync.attr,
b3b94faa	503	&tune_attr_stall_secs.attr,
b3b94faa	504	&tune_attr_statfs_quantum.attr,
b3b94faa DT	505	&tune_attr_quota_scale.attr,
b3b94faa DT	506	&tune_attr_new_files_jdata.attr,
ea67eedb	507	NULL,
b3b94faa DT	508	};
b3b94faa DT	509
b3b94faa DT	510	static struct attribute_group tune_group = {
b3b94faa DT	511	.name = "tune",
ea67eedb	512	.attrs = tune_attrs,
b3b94faa DT	513	};
b3b94faa DT	514
f057f6cd SW	515	static struct attribute_group lock_module_group = {
	516	.name = "lock_module",
	517	.attrs = lock_module_attrs,
	518	};
	519
b3b94faa DT	520	int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
	521	{
	522	int error;
	523
9bec101a	524	sdp->sd_kobj.kset = gfs2_kset;
901195ed GKH	525	error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL,
901195ed GKH	526	"%s", sdp->sd_table_name);
b3b94faa DT	527	if (error)
	528	goto fail;
	529
b3b94faa DT	530	error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
b3b94faa DT	531	if (error)
f6eb5349	532	goto fail_reg;
b3b94faa	533
f057f6cd SW	534	error = sysfs_create_group(&sdp->sd_kobj, &lock_module_group);
	535	if (error)
	536	goto fail_tune;
	537
901195ed	538	kobject_uevent(&sdp->sd_kobj, KOBJ_ADD);
b3b94faa DT	539	return 0;
b3b94faa DT	540
f057f6cd SW	541	fail_tune:
f057f6cd SW	542	sysfs_remove_group(&sdp->sd_kobj, &tune_group);
a91ea69f	543	fail_reg:
197b12d6	544	kobject_put(&sdp->sd_kobj);
a91ea69f	545	fail:
65952fb4	546	fs_err(sdp, "error %d adding sysfs files", error);
b3b94faa DT	547	return error;
	548	}
	549
	550	void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
	551	{
	552	sysfs_remove_group(&sdp->sd_kobj, &tune_group);
f057f6cd	553	sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
197b12d6	554	kobject_put(&sdp->sd_kobj);
b3b94faa DT	555	}
b3b94faa DT	556
02e3cc70	557
fdd1062e SW	558	static int gfs2_uevent(struct kset kset, struct kobject kobj,
	559	struct kobj_uevent_env *env)
	560	{
	561	struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
02e3cc70 SW	562	const u8 *uuid = sdp->sd_sb.sb_uuid;
02e3cc70 SW	563
fdd1062e SW	564	add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name);
fdd1062e SW	565	add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name);
02e3cc70 SW	566	if (gfs2_uuid_valid(uuid)) {
	567	add_uevent_var(env, "UUID=%02X%02X%02X%02X-%02X%02X-%02X%02X-"
	568	"%02X%02X-%02X%02X%02X%02X%02X%02X",
	569	uuid[0], uuid[1], uuid[2], uuid[3], uuid[4],
	570	uuid[5], uuid[6], uuid[7], uuid[8], uuid[9],
	571	uuid[10], uuid[11], uuid[12], uuid[13],
	572	uuid[14], uuid[15]);
	573	}
fdd1062e SW	574	return 0;
	575	}
	576
	577	static struct kset_uevent_ops gfs2_uevent_ops = {
	578	.uevent = gfs2_uevent,
	579	};
	580
	581
b3b94faa DT	582	int gfs2_sys_init(void)
b3b94faa DT	583	{
fdd1062e	584	gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj);
9bec101a GKH	585	if (!gfs2_kset)
	586	return -ENOMEM;
	587	return 0;
b3b94faa DT	588	}
	589
	590	void gfs2_sys_uninit(void)
	591	{
9bec101a	592	kset_unregister(gfs2_kset);
b3b94faa DT	593	}
b3b94faa DT	594