[linux-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/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 const 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, "%pUB\n", uuid);
}

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, 1);
	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(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_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=%pUB", uuid);
	return 0;
}

static const 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>
b3b94faa DT	11	#include <linux/spinlock.h>
	12	#include <linux/completion.h>
	13	#include <linux/buffer_head.h>
	14	#include <linux/module.h>
	15	#include <linux/kobject.h>
b3b94faa	16	#include <asm/uaccess.h>
f057f6cd	17	#include <linux/gfs2_ondisk.h>
31e54b01	18	#include <linux/genhd.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
52cf25d0	51	static const struct sysfs_ops gfs2_attr_ops = {
48c2b613 SW	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;
f0b34ae6	87	return snprintf(buf, PAGE_SIZE, "%pUB\n", uuid);
02e3cc70 SW	88	}
02e3cc70 SW	89
b3b94faa DT	90	static ssize_t freeze_show(struct gfs2_sbd sdp, char buf)
	91	{
	92	unsigned int count;
	93
f55ab26a	94	mutex_lock(&sdp->sd_freeze_lock);
b3b94faa	95	count = sdp->sd_freeze_count;
f55ab26a	96	mutex_unlock(&sdp->sd_freeze_lock);
b3b94faa	97
3204a6c0	98	return snprintf(buf, PAGE_SIZE, "%u\n", count);
b3b94faa DT	99	}
	100
	101	static ssize_t freeze_store(struct gfs2_sbd sdp, const char buf, size_t len)
	102	{
	103	ssize_t ret = len;
	104	int error = 0;
	105	int n = simple_strtol(buf, NULL, 0);
	106
	107	if (!capable(CAP_SYS_ADMIN))
	108	return -EACCES;
	109
	110	switch (n) {
	111	case 0:
	112	gfs2_unfreeze_fs(sdp);
	113	break;
	114	case 1:
	115	error = gfs2_freeze_fs(sdp);
	116	break;
	117	default:
	118	ret = -EINVAL;
	119	}
	120
	121	if (error)
	122	fs_warn(sdp, "freeze %d error %d", n, error);
	123
	124	return ret;
	125	}
	126
	127	static ssize_t withdraw_show(struct gfs2_sbd sdp, char buf)
	128	{
	129	unsigned int b = test_bit(SDF_SHUTDOWN, &sdp->sd_flags);
3204a6c0	130	return snprintf(buf, PAGE_SIZE, "%u\n", b);
b3b94faa DT	131	}
	132
	133	static ssize_t withdraw_store(struct gfs2_sbd sdp, const char buf, size_t len)
	134	{
	135	if (!capable(CAP_SYS_ADMIN))
	136	return -EACCES;
	137
	138	if (simple_strtol(buf, NULL, 0) != 1)
	139	return -EINVAL;
	140
	141	gfs2_lm_withdraw(sdp,
	142	"GFS2: fsid=%s: withdrawing from cluster at user's request\n",
	143	sdp->sd_fsname);
	144	return len;
	145	}
	146
	147	static ssize_t statfs_sync_store(struct gfs2_sbd sdp, const char buf,
	148	size_t len)
	149	{
	150	if (!capable(CAP_SYS_ADMIN))
	151	return -EACCES;
	152
	153	if (simple_strtol(buf, NULL, 0) != 1)
	154	return -EINVAL;
	155
8c42d637	156	gfs2_statfs_sync(sdp->sd_vfs, 0);
b3b94faa DT	157	return len;
	158	}
	159
b3b94faa DT	160	static ssize_t quota_sync_store(struct gfs2_sbd sdp, const char buf,
	161	size_t len)
	162	{
	163	if (!capable(CAP_SYS_ADMIN))
	164	return -EACCES;
	165
	166	if (simple_strtol(buf, NULL, 0) != 1)
	167	return -EINVAL;
	168
5fb324ad	169	gfs2_quota_sync(sdp->sd_vfs, 0, 1);
b3b94faa DT	170	return len;
	171	}
	172
	173	static ssize_t quota_refresh_user_store(struct gfs2_sbd sdp, const char buf,
	174	size_t len)
	175	{
ea762338	176	int error;
cd915493	177	u32 id;
b3b94faa DT	178
	179	if (!capable(CAP_SYS_ADMIN))
	180	return -EACCES;
	181
	182	id = simple_strtoul(buf, NULL, 0);
	183
ea762338 SW	184	error = gfs2_quota_refresh(sdp, 1, id);
ea762338 SW	185	return error ? error : len;
b3b94faa DT	186	}
	187
	188	static ssize_t quota_refresh_group_store(struct gfs2_sbd sdp, const char buf,
	189	size_t len)
	190	{
ea762338	191	int error;
cd915493	192	u32 id;
b3b94faa DT	193
	194	if (!capable(CAP_SYS_ADMIN))
	195	return -EACCES;
	196
	197	id = simple_strtoul(buf, NULL, 0);
	198
ea762338 SW	199	error = gfs2_quota_refresh(sdp, 0, id);
ea762338 SW	200	return error ? error : len;
b3b94faa DT	201	}
b3b94faa DT	202
64d576ba SW	203	static ssize_t demote_rq_store(struct gfs2_sbd sdp, const char buf, size_t len)
	204	{
	205	struct gfs2_glock *gl;
	206	const struct gfs2_glock_operations *glops;
	207	unsigned int glmode;
	208	unsigned int gltype;
	209	unsigned long long glnum;
	210	char mode[16];
	211	int rv;
	212
	213	if (!capable(CAP_SYS_ADMIN))
	214	return -EACCES;
	215
	216	rv = sscanf(buf, "%u:%llu %15s", &gltype, &glnum,
	217	mode);
	218	if (rv != 3)
	219	return -EINVAL;
	220
	221	if (strcmp(mode, "EX") == 0)
	222	glmode = LM_ST_UNLOCKED;
	223	else if ((strcmp(mode, "CW") == 0) \|\| (strcmp(mode, "DF") == 0))
	224	glmode = LM_ST_DEFERRED;
	225	else if ((strcmp(mode, "PR") == 0) \|\| (strcmp(mode, "SH") == 0))
	226	glmode = LM_ST_SHARED;
	227	else
	228	return -EINVAL;
	229
	230	if (gltype > LM_TYPE_JOURNAL)
	231	return -EINVAL;
	232	glops = gfs2_glops_list[gltype];
	233	if (glops == NULL)
	234	return -EINVAL;
	235	rv = gfs2_glock_get(sdp, glnum, glops, 0, &gl);
	236	if (rv)
	237	return rv;
	238	gfs2_glock_cb(gl, glmode);
	239	gfs2_glock_put(gl);
	240	return len;
	241	}
	242
b3b94faa DT	243
	244	#define GFS2_ATTR(name, mode, show, store) \
	245	static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store)
	246
	247	GFS2_ATTR(id, 0444, id_show, NULL);
	248	GFS2_ATTR(fsname, 0444, fsname_show, NULL);
02e3cc70	249	GFS2_ATTR(uuid, 0444, uuid_show, NULL);
b3b94faa	250	GFS2_ATTR(freeze, 0644, freeze_show, freeze_store);
b3b94faa DT	251	GFS2_ATTR(withdraw, 0644, withdraw_show, withdraw_store);
	252	GFS2_ATTR(statfs_sync, 0200, NULL, statfs_sync_store);
	253	GFS2_ATTR(quota_sync, 0200, NULL, quota_sync_store);
	254	GFS2_ATTR(quota_refresh_user, 0200, NULL, quota_refresh_user_store);
	255	GFS2_ATTR(quota_refresh_group, 0200, NULL, quota_refresh_group_store);
64d576ba	256	GFS2_ATTR(demote_rq, 0200, NULL, demote_rq_store);
b3b94faa DT	257
	258	static struct attribute *gfs2_attrs[] = {
	259	&gfs2_attr_id.attr,
	260	&gfs2_attr_fsname.attr,
02e3cc70	261	&gfs2_attr_uuid.attr,
b3b94faa	262	&gfs2_attr_freeze.attr,
b3b94faa DT	263	&gfs2_attr_withdraw.attr,
	264	&gfs2_attr_statfs_sync.attr,
	265	&gfs2_attr_quota_sync.attr,
	266	&gfs2_attr_quota_refresh_user.attr,
	267	&gfs2_attr_quota_refresh_group.attr,
64d576ba	268	&gfs2_attr_demote_rq.attr,
b3b94faa DT	269	NULL,
	270	};
	271
b3b94faa DT	272	static struct kobj_type gfs2_ktype = {
	273	.default_attrs = gfs2_attrs,
	274	.sysfs_ops = &gfs2_attr_ops,
	275	};
	276
f057f6cd SW	277
	278	/*
	279	* lock_module. Originally from lock_dlm
	280	*/
	281
	282	static ssize_t proto_name_show(struct gfs2_sbd sdp, char buf)
	283	{
	284	const struct lm_lockops *ops = sdp->sd_lockstruct.ls_ops;
	285	return sprintf(buf, "%s\n", ops->lm_proto_name);
	286	}
	287
	288	static ssize_t block_show(struct gfs2_sbd sdp, char buf)
	289	{
	290	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
	291	ssize_t ret;
	292	int val = 0;
	293
	294	if (test_bit(DFL_BLOCK_LOCKS, &ls->ls_flags))
	295	val = 1;
	296	ret = sprintf(buf, "%d\n", val);
	297	return ret;
	298	}
	299
	300	static ssize_t block_store(struct gfs2_sbd sdp, const char buf, size_t len)
	301	{
	302	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
	303	ssize_t ret = len;
	304	int val;
	305
	306	val = simple_strtol(buf, NULL, 0);
	307
	308	if (val == 1)
	309	set_bit(DFL_BLOCK_LOCKS, &ls->ls_flags);
	310	else if (val == 0) {
	311	clear_bit(DFL_BLOCK_LOCKS, &ls->ls_flags);
	312	smp_mb__after_clear_bit();
	313	gfs2_glock_thaw(sdp);
	314	} else {
	315	ret = -EINVAL;
	316	}
	317	return ret;
	318	}
	319
f057f6cd SW	320	static ssize_t lkfirst_show(struct gfs2_sbd sdp, char buf)
	321	{
	322	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
	323	return sprintf(buf, "%d\n", ls->ls_first);
	324	}
	325
	326	static ssize_t first_done_show(struct gfs2_sbd sdp, char buf)
	327	{
	328	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
	329	return sprintf(buf, "%d\n", ls->ls_first_done);
	330	}
	331
fe64d517	332	static ssize_t recover_store(struct gfs2_sbd sdp, const char buf, size_t len)
f057f6cd	333	{
fe64d517	334	unsigned jid;
f057f6cd	335	struct gfs2_jdesc *jd;
fe64d517 SW	336	int rv;
	337
	338	rv = sscanf(buf, "%u", &jid);
	339	if (rv != 1)
	340	return -EINVAL;
f057f6cd	341
fe64d517	342	rv = -ESHUTDOWN;
f057f6cd	343	spin_lock(&sdp->sd_jindex_spin);
fe64d517 SW	344	if (test_bit(SDF_NORECOVERY, &sdp->sd_flags))
	345	goto out;
	346	rv = -EBUSY;
	347	if (sdp->sd_jdesc->jd_jid == jid)
	348	goto out;
	349	rv = -ENOENT;
f057f6cd SW	350	list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
	351	if (jd->jd_jid != jid)
	352	continue;
fe64d517	353	rv = slow_work_enqueue(&jd->jd_work);
f057f6cd SW	354	break;
f057f6cd SW	355	}
fe64d517	356	out:
f057f6cd	357	spin_unlock(&sdp->sd_jindex_spin);
fe64d517	358	return rv ? rv : len;
f057f6cd SW	359	}
	360
	361	static ssize_t recover_done_show(struct gfs2_sbd sdp, char buf)
	362	{
	363	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
	364	return sprintf(buf, "%d\n", ls->ls_recover_jid_done);
	365	}
	366
	367	static ssize_t recover_status_show(struct gfs2_sbd sdp, char buf)
	368	{
	369	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
	370	return sprintf(buf, "%d\n", ls->ls_recover_jid_status);
	371	}
	372
e1b28aab SW	373	static ssize_t jid_show(struct gfs2_sbd sdp, char buf)
	374	{
	375	return sprintf(buf, "%u\n", sdp->sd_lockstruct.ls_jid);
	376	}
	377
f057f6cd	378	#define GDLM_ATTR(_name,_mode,_show,_store) \
48c2b613	379	static struct gfs2_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store)
f057f6cd	380
d7e623da SW	381	GDLM_ATTR(proto_name, 0444, proto_name_show, NULL);
	382	GDLM_ATTR(block, 0644, block_show, block_store);
	383	GDLM_ATTR(withdraw, 0644, withdraw_show, withdraw_store);
d7e623da SW	384	GDLM_ATTR(jid, 0444, jid_show, NULL);
	385	GDLM_ATTR(first, 0444, lkfirst_show, NULL);
	386	GDLM_ATTR(first_done, 0444, first_done_show, NULL);
	387	GDLM_ATTR(recover, 0600, NULL, recover_store);
	388	GDLM_ATTR(recover_done, 0444, recover_done_show, NULL);
	389	GDLM_ATTR(recover_status, 0444, recover_status_show, NULL);
f057f6cd SW	390
	391	static struct attribute *lock_module_attrs[] = {
	392	&gdlm_attr_proto_name.attr,
	393	&gdlm_attr_block.attr,
	394	&gdlm_attr_withdraw.attr,
e1b28aab	395	&gdlm_attr_jid.attr,
f057f6cd SW	396	&gdlm_attr_first.attr,
	397	&gdlm_attr_first_done.attr,
	398	&gdlm_attr_recover.attr,
	399	&gdlm_attr_recover_done.attr,
	400	&gdlm_attr_recover_status.attr,
ea67eedb	401	NULL,
b3b94faa DT	402	};
b3b94faa DT	403
b3b94faa DT	404	/*
	405	* get and set struct gfs2_tune fields
	406	*/
	407
	408	static ssize_t quota_scale_show(struct gfs2_sbd sdp, char buf)
	409	{
3204a6c0 DT	410	return snprintf(buf, PAGE_SIZE, "%u %u\n",
	411	sdp->sd_tune.gt_quota_scale_num,
	412	sdp->sd_tune.gt_quota_scale_den);
b3b94faa DT	413	}
	414
	415	static ssize_t quota_scale_store(struct gfs2_sbd sdp, const char buf,
	416	size_t len)
	417	{
	418	struct gfs2_tune *gt = &sdp->sd_tune;
	419	unsigned int x, y;
	420
	421	if (!capable(CAP_SYS_ADMIN))
	422	return -EACCES;
	423
	424	if (sscanf(buf, "%u %u", &x, &y) != 2 \|\| !y)
	425	return -EINVAL;
	426
	427	spin_lock(&gt->gt_spin);
	428	gt->gt_quota_scale_num = x;
	429	gt->gt_quota_scale_den = y;
	430	spin_unlock(&gt->gt_spin);
	431	return len;
	432	}
	433
	434	static ssize_t tune_set(struct gfs2_sbd sdp, unsigned int field,
	435	int check_zero, const char *buf, size_t len)
	436	{
	437	struct gfs2_tune *gt = &sdp->sd_tune;
	438	unsigned int x;
	439
	440	if (!capable(CAP_SYS_ADMIN))
	441	return -EACCES;
	442
	443	x = simple_strtoul(buf, NULL, 0);
	444
	445	if (check_zero && !x)
	446	return -EINVAL;
	447
	448	spin_lock(&gt->gt_spin);
	449	*field = x;
	450	spin_unlock(&gt->gt_spin);
	451	return len;
	452	}
	453
b3b94faa	454	#define TUNE_ATTR_3(name, show, store) \
48c2b613	455	static struct gfs2_attr tune_attr_##name = __ATTR(name, 0644, show, store)
b3b94faa DT	456
	457	#define TUNE_ATTR_2(name, store) \
	458	static ssize_t name##_show(struct gfs2_sbd sdp, char buf) \
	459	{ \
3204a6c0	460	return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name); \
b3b94faa DT	461	} \
	462	TUNE_ATTR_3(name, name##_show, store)
	463
	464	#define TUNE_ATTR(name, check_zero) \
	465	static ssize_t name##_store(struct gfs2_sbd sdp, const char buf, size_t len)\
	466	{ \
	467	return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len); \
	468	} \
	469	TUNE_ATTR_2(name, name##_store)
	470
b3b94faa DT	471	TUNE_ATTR(incore_log_blocks, 0);
b3b94faa DT	472	TUNE_ATTR(log_flush_secs, 0);
b3b94faa DT	473	TUNE_ATTR(quota_warn_period, 0);
b3b94faa DT	474	TUNE_ATTR(quota_quantum, 0);
b3b94faa DT	475	TUNE_ATTR(max_readahead, 0);
b3b94faa DT	476	TUNE_ATTR(complain_secs, 0);
b3b94faa DT	477	TUNE_ATTR(statfs_slow, 0);
b3b94faa DT	478	TUNE_ATTR(new_files_jdata, 0);
b3b94faa	479	TUNE_ATTR(quota_simul_sync, 1);
b3b94faa	480	TUNE_ATTR(statfs_quantum, 1);
b3b94faa DT	481	TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
	482
	483	static struct attribute *tune_attrs[] = {
b3b94faa DT	484	&tune_attr_incore_log_blocks.attr,
b3b94faa DT	485	&tune_attr_log_flush_secs.attr,
b3b94faa DT	486	&tune_attr_quota_warn_period.attr,
b3b94faa DT	487	&tune_attr_quota_quantum.attr,
b3b94faa DT	488	&tune_attr_max_readahead.attr,
b3b94faa DT	489	&tune_attr_complain_secs.attr,
b3b94faa DT	490	&tune_attr_statfs_slow.attr,
b3b94faa DT	491	&tune_attr_quota_simul_sync.attr,
b3b94faa	492	&tune_attr_statfs_quantum.attr,
b3b94faa DT	493	&tune_attr_quota_scale.attr,
b3b94faa DT	494	&tune_attr_new_files_jdata.attr,
ea67eedb	495	NULL,
b3b94faa DT	496	};
b3b94faa DT	497
b3b94faa DT	498	static struct attribute_group tune_group = {
b3b94faa DT	499	.name = "tune",
ea67eedb	500	.attrs = tune_attrs,
b3b94faa DT	501	};
b3b94faa DT	502
f057f6cd SW	503	static struct attribute_group lock_module_group = {
	504	.name = "lock_module",
	505	.attrs = lock_module_attrs,
	506	};
	507
b3b94faa DT	508	int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
b3b94faa DT	509	{
440d6da2	510	struct super_block *sb = sdp->sd_vfs;
b3b94faa	511	int error;
440d6da2 SW	512	char ro[20];
	513	char spectator[20];
	514	char *envp[] = { ro, spectator, NULL };
	515
	516	sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0);
	517	sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
b3b94faa	518
9bec101a	519	sdp->sd_kobj.kset = gfs2_kset;
901195ed GKH	520	error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL,
901195ed GKH	521	"%s", sdp->sd_table_name);
b3b94faa DT	522	if (error)
	523	goto fail;
	524
b3b94faa DT	525	error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
b3b94faa DT	526	if (error)
f6eb5349	527	goto fail_reg;
b3b94faa	528
f057f6cd SW	529	error = sysfs_create_group(&sdp->sd_kobj, &lock_module_group);
	530	if (error)
	531	goto fail_tune;
	532
31e54b01 SW	533	error = sysfs_create_link(&sdp->sd_kobj,
	534	&disk_to_dev(sb->s_bdev->bd_disk)->kobj,
	535	"device");
	536	if (error)
	537	goto fail_lock_module;
	538
440d6da2	539	kobject_uevent_env(&sdp->sd_kobj, KOBJ_ADD, envp);
b3b94faa DT	540	return 0;
b3b94faa DT	541
31e54b01 SW	542	fail_lock_module:
31e54b01 SW	543	sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
f057f6cd SW	544	fail_tune:
f057f6cd SW	545	sysfs_remove_group(&sdp->sd_kobj, &tune_group);
a91ea69f	546	fail_reg:
197b12d6	547	kobject_put(&sdp->sd_kobj);
a91ea69f	548	fail:
65952fb4	549	fs_err(sdp, "error %d adding sysfs files", error);
b3b94faa DT	550	return error;
	551	}
	552
	553	void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
	554	{
31e54b01	555	sysfs_remove_link(&sdp->sd_kobj, "device");
b3b94faa	556	sysfs_remove_group(&sdp->sd_kobj, &tune_group);
f057f6cd	557	sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
197b12d6	558	kobject_put(&sdp->sd_kobj);
b3b94faa DT	559	}
b3b94faa DT	560
fdd1062e SW	561	static int gfs2_uevent(struct kset kset, struct kobject kobj,
	562	struct kobj_uevent_env *env)
	563	{
	564	struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
02e3cc70 SW	565	const u8 *uuid = sdp->sd_sb.sb_uuid;
02e3cc70 SW	566
fdd1062e SW	567	add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name);
fdd1062e SW	568	add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name);
440d6da2 SW	569	if (!sdp->sd_args.ar_spectator)
440d6da2 SW	570	add_uevent_var(env, "JOURNALID=%u", sdp->sd_lockstruct.ls_jid);
f0b34ae6 JP	571	if (gfs2_uuid_valid(uuid))
f0b34ae6 JP	572	add_uevent_var(env, "UUID=%pUB", uuid);
fdd1062e SW	573	return 0;
	574	}
	575
9cd43611	576	static const struct kset_uevent_ops gfs2_uevent_ops = {
fdd1062e SW	577	.uevent = gfs2_uevent,
	578	};
	579
b3b94faa DT	580	int gfs2_sys_init(void)
b3b94faa DT	581	{
fdd1062e	582	gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj);
9bec101a GKH	583	if (!gfs2_kset)
	584	return -ENOMEM;
	585	return 0;
b3b94faa DT	586	}
	587
	588	void gfs2_sys_uninit(void)
	589	{
9bec101a	590	kset_unregister(gfs2_kset);
b3b94faa DT	591	}
b3b94faa DT	592