[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 <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, "%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 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;
f0b34ae6	88	return snprintf(buf, PAGE_SIZE, "%pUB\n", uuid);
02e3cc70 SW	89	}
02e3cc70 SW	90
b3b94faa DT	91	static ssize_t freeze_show(struct gfs2_sbd sdp, char buf)
	92	{
	93	unsigned int count;
	94
f55ab26a	95	mutex_lock(&sdp->sd_freeze_lock);
b3b94faa	96	count = sdp->sd_freeze_count;
f55ab26a	97	mutex_unlock(&sdp->sd_freeze_lock);
b3b94faa	98
3204a6c0	99	return snprintf(buf, PAGE_SIZE, "%u\n", count);
b3b94faa DT	100	}
	101
	102	static ssize_t freeze_store(struct gfs2_sbd sdp, const char buf, size_t len)
	103	{
	104	ssize_t ret = len;
	105	int error = 0;
	106	int n = simple_strtol(buf, NULL, 0);
	107
	108	if (!capable(CAP_SYS_ADMIN))
	109	return -EACCES;
	110
	111	switch (n) {
	112	case 0:
	113	gfs2_unfreeze_fs(sdp);
	114	break;
	115	case 1:
	116	error = gfs2_freeze_fs(sdp);
	117	break;
	118	default:
	119	ret = -EINVAL;
	120	}
	121
	122	if (error)
	123	fs_warn(sdp, "freeze %d error %d", n, error);
	124
	125	return ret;
	126	}
	127
	128	static ssize_t withdraw_show(struct gfs2_sbd sdp, char buf)
	129	{
	130	unsigned int b = test_bit(SDF_SHUTDOWN, &sdp->sd_flags);
3204a6c0	131	return snprintf(buf, PAGE_SIZE, "%u\n", b);
b3b94faa DT	132	}
	133
	134	static ssize_t withdraw_store(struct gfs2_sbd sdp, const char buf, size_t len)
	135	{
	136	if (!capable(CAP_SYS_ADMIN))
	137	return -EACCES;
	138
	139	if (simple_strtol(buf, NULL, 0) != 1)
	140	return -EINVAL;
	141
	142	gfs2_lm_withdraw(sdp,
	143	"GFS2: fsid=%s: withdrawing from cluster at user's request\n",
	144	sdp->sd_fsname);
	145	return len;
	146	}
	147
	148	static ssize_t statfs_sync_store(struct gfs2_sbd sdp, const char buf,
	149	size_t len)
	150	{
	151	if (!capable(CAP_SYS_ADMIN))
	152	return -EACCES;
	153
	154	if (simple_strtol(buf, NULL, 0) != 1)
	155	return -EINVAL;
	156
8c42d637	157	gfs2_statfs_sync(sdp->sd_vfs, 0);
b3b94faa DT	158	return len;
	159	}
	160
b3b94faa DT	161	static ssize_t quota_sync_store(struct gfs2_sbd sdp, const char buf,
	162	size_t len)
	163	{
	164	if (!capable(CAP_SYS_ADMIN))
	165	return -EACCES;
	166
	167	if (simple_strtol(buf, NULL, 0) != 1)
	168	return -EINVAL;
	169
5fb324ad	170	gfs2_quota_sync(sdp->sd_vfs, 0, 1);
b3b94faa DT	171	return len;
	172	}
	173
	174	static ssize_t quota_refresh_user_store(struct gfs2_sbd sdp, const char buf,
	175	size_t len)
	176	{
ea762338	177	int error;
cd915493	178	u32 id;
b3b94faa DT	179
	180	if (!capable(CAP_SYS_ADMIN))
	181	return -EACCES;
	182
	183	id = simple_strtoul(buf, NULL, 0);
	184
ea762338 SW	185	error = gfs2_quota_refresh(sdp, 1, id);
ea762338 SW	186	return error ? error : len;
b3b94faa DT	187	}
	188
	189	static ssize_t quota_refresh_group_store(struct gfs2_sbd sdp, const char buf,
	190	size_t len)
	191	{
ea762338	192	int error;
cd915493	193	u32 id;
b3b94faa DT	194
	195	if (!capable(CAP_SYS_ADMIN))
	196	return -EACCES;
	197
	198	id = simple_strtoul(buf, NULL, 0);
	199
ea762338 SW	200	error = gfs2_quota_refresh(sdp, 0, id);
ea762338 SW	201	return error ? error : len;
b3b94faa DT	202	}
b3b94faa DT	203
64d576ba SW	204	static ssize_t demote_rq_store(struct gfs2_sbd sdp, const char buf, size_t len)
	205	{
	206	struct gfs2_glock *gl;
	207	const struct gfs2_glock_operations *glops;
	208	unsigned int glmode;
	209	unsigned int gltype;
	210	unsigned long long glnum;
	211	char mode[16];
	212	int rv;
	213
	214	if (!capable(CAP_SYS_ADMIN))
	215	return -EACCES;
	216
	217	rv = sscanf(buf, "%u:%llu %15s", &gltype, &glnum,
	218	mode);
	219	if (rv != 3)
	220	return -EINVAL;
	221
	222	if (strcmp(mode, "EX") == 0)
	223	glmode = LM_ST_UNLOCKED;
	224	else if ((strcmp(mode, "CW") == 0) \|\| (strcmp(mode, "DF") == 0))
	225	glmode = LM_ST_DEFERRED;
	226	else if ((strcmp(mode, "PR") == 0) \|\| (strcmp(mode, "SH") == 0))
	227	glmode = LM_ST_SHARED;
	228	else
	229	return -EINVAL;
	230
	231	if (gltype > LM_TYPE_JOURNAL)
	232	return -EINVAL;
	233	glops = gfs2_glops_list[gltype];
	234	if (glops == NULL)
	235	return -EINVAL;
	236	rv = gfs2_glock_get(sdp, glnum, glops, 0, &gl);
	237	if (rv)
	238	return rv;
	239	gfs2_glock_cb(gl, glmode);
	240	gfs2_glock_put(gl);
	241	return len;
	242	}
	243
b3b94faa DT	244
	245	#define GFS2_ATTR(name, mode, show, store) \
	246	static struct gfs2_attr gfs2_attr_##name = __ATTR(name, mode, show, store)
	247
	248	GFS2_ATTR(id, 0444, id_show, NULL);
	249	GFS2_ATTR(fsname, 0444, fsname_show, NULL);
02e3cc70	250	GFS2_ATTR(uuid, 0444, uuid_show, NULL);
b3b94faa	251	GFS2_ATTR(freeze, 0644, freeze_show, freeze_store);
b3b94faa DT	252	GFS2_ATTR(withdraw, 0644, withdraw_show, withdraw_store);
	253	GFS2_ATTR(statfs_sync, 0200, NULL, statfs_sync_store);
	254	GFS2_ATTR(quota_sync, 0200, NULL, quota_sync_store);
	255	GFS2_ATTR(quota_refresh_user, 0200, NULL, quota_refresh_user_store);
	256	GFS2_ATTR(quota_refresh_group, 0200, NULL, quota_refresh_group_store);
64d576ba	257	GFS2_ATTR(demote_rq, 0200, NULL, demote_rq_store);
b3b94faa DT	258
	259	static struct attribute *gfs2_attrs[] = {
	260	&gfs2_attr_id.attr,
	261	&gfs2_attr_fsname.attr,
02e3cc70	262	&gfs2_attr_uuid.attr,
b3b94faa	263	&gfs2_attr_freeze.attr,
b3b94faa DT	264	&gfs2_attr_withdraw.attr,
	265	&gfs2_attr_statfs_sync.attr,
	266	&gfs2_attr_quota_sync.attr,
	267	&gfs2_attr_quota_refresh_user.attr,
	268	&gfs2_attr_quota_refresh_group.attr,
64d576ba	269	&gfs2_attr_demote_rq.attr,
b3b94faa DT	270	NULL,
	271	};
	272
b3b94faa DT	273	static struct kobj_type gfs2_ktype = {
	274	.default_attrs = gfs2_attrs,
	275	.sysfs_ops = &gfs2_attr_ops,
	276	};
	277
f057f6cd SW	278
	279	/*
	280	* lock_module. Originally from lock_dlm
	281	*/
	282
	283	static ssize_t proto_name_show(struct gfs2_sbd sdp, char buf)
	284	{
	285	const struct lm_lockops *ops = sdp->sd_lockstruct.ls_ops;
	286	return sprintf(buf, "%s\n", ops->lm_proto_name);
	287	}
	288
	289	static ssize_t block_show(struct gfs2_sbd sdp, char buf)
	290	{
	291	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
	292	ssize_t ret;
	293	int val = 0;
	294
	295	if (test_bit(DFL_BLOCK_LOCKS, &ls->ls_flags))
	296	val = 1;
	297	ret = sprintf(buf, "%d\n", val);
	298	return ret;
	299	}
	300
	301	static ssize_t block_store(struct gfs2_sbd sdp, const char buf, size_t len)
	302	{
	303	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
	304	ssize_t ret = len;
	305	int val;
	306
	307	val = simple_strtol(buf, NULL, 0);
	308
	309	if (val == 1)
	310	set_bit(DFL_BLOCK_LOCKS, &ls->ls_flags);
	311	else if (val == 0) {
	312	clear_bit(DFL_BLOCK_LOCKS, &ls->ls_flags);
	313	smp_mb__after_clear_bit();
	314	gfs2_glock_thaw(sdp);
	315	} else {
	316	ret = -EINVAL;
	317	}
	318	return ret;
	319	}
	320
f057f6cd SW	321	static ssize_t lkfirst_show(struct gfs2_sbd sdp, char buf)
	322	{
	323	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
	324	return sprintf(buf, "%d\n", ls->ls_first);
	325	}
	326
	327	static ssize_t first_done_show(struct gfs2_sbd sdp, char buf)
	328	{
	329	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
	330	return sprintf(buf, "%d\n", ls->ls_first_done);
	331	}
	332
fe64d517	333	static ssize_t recover_store(struct gfs2_sbd sdp, const char buf, size_t len)
f057f6cd	334	{
fe64d517	335	unsigned jid;
f057f6cd	336	struct gfs2_jdesc *jd;
fe64d517 SW	337	int rv;
	338
	339	rv = sscanf(buf, "%u", &jid);
	340	if (rv != 1)
	341	return -EINVAL;
f057f6cd	342
fe64d517	343	rv = -ESHUTDOWN;
f057f6cd	344	spin_lock(&sdp->sd_jindex_spin);
fe64d517 SW	345	if (test_bit(SDF_NORECOVERY, &sdp->sd_flags))
	346	goto out;
	347	rv = -EBUSY;
	348	if (sdp->sd_jdesc->jd_jid == jid)
	349	goto out;
	350	rv = -ENOENT;
f057f6cd SW	351	list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
	352	if (jd->jd_jid != jid)
	353	continue;
fe64d517	354	rv = slow_work_enqueue(&jd->jd_work);
f057f6cd SW	355	break;
f057f6cd SW	356	}
fe64d517	357	out:
f057f6cd	358	spin_unlock(&sdp->sd_jindex_spin);
fe64d517	359	return rv ? rv : len;
f057f6cd SW	360	}
	361
	362	static ssize_t recover_done_show(struct gfs2_sbd sdp, char buf)
	363	{
	364	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
	365	return sprintf(buf, "%d\n", ls->ls_recover_jid_done);
	366	}
	367
	368	static ssize_t recover_status_show(struct gfs2_sbd sdp, char buf)
	369	{
	370	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
	371	return sprintf(buf, "%d\n", ls->ls_recover_jid_status);
	372	}
	373
e1b28aab SW	374	static ssize_t jid_show(struct gfs2_sbd sdp, char buf)
	375	{
	376	return sprintf(buf, "%u\n", sdp->sd_lockstruct.ls_jid);
	377	}
	378
f057f6cd	379	#define GDLM_ATTR(_name,_mode,_show,_store) \
48c2b613	380	static struct gfs2_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store)
f057f6cd	381
d7e623da SW	382	GDLM_ATTR(proto_name, 0444, proto_name_show, NULL);
	383	GDLM_ATTR(block, 0644, block_show, block_store);
	384	GDLM_ATTR(withdraw, 0644, withdraw_show, withdraw_store);
d7e623da SW	385	GDLM_ATTR(jid, 0444, jid_show, NULL);
	386	GDLM_ATTR(first, 0444, lkfirst_show, NULL);
	387	GDLM_ATTR(first_done, 0444, first_done_show, NULL);
	388	GDLM_ATTR(recover, 0600, NULL, recover_store);
	389	GDLM_ATTR(recover_done, 0444, recover_done_show, NULL);
	390	GDLM_ATTR(recover_status, 0444, recover_status_show, NULL);
f057f6cd SW	391
	392	static struct attribute *lock_module_attrs[] = {
	393	&gdlm_attr_proto_name.attr,
	394	&gdlm_attr_block.attr,
	395	&gdlm_attr_withdraw.attr,
e1b28aab	396	&gdlm_attr_jid.attr,
f057f6cd SW	397	&gdlm_attr_first.attr,
	398	&gdlm_attr_first_done.attr,
	399	&gdlm_attr_recover.attr,
	400	&gdlm_attr_recover_done.attr,
	401	&gdlm_attr_recover_status.attr,
ea67eedb	402	NULL,
b3b94faa DT	403	};
b3b94faa DT	404
b3b94faa DT	405	/*
	406	* get and set struct gfs2_tune fields
	407	*/
	408
	409	static ssize_t quota_scale_show(struct gfs2_sbd sdp, char buf)
	410	{
3204a6c0 DT	411	return snprintf(buf, PAGE_SIZE, "%u %u\n",
	412	sdp->sd_tune.gt_quota_scale_num,
	413	sdp->sd_tune.gt_quota_scale_den);
b3b94faa DT	414	}
	415
	416	static ssize_t quota_scale_store(struct gfs2_sbd sdp, const char buf,
	417	size_t len)
	418	{
	419	struct gfs2_tune *gt = &sdp->sd_tune;
	420	unsigned int x, y;
	421
	422	if (!capable(CAP_SYS_ADMIN))
	423	return -EACCES;
	424
	425	if (sscanf(buf, "%u %u", &x, &y) != 2 \|\| !y)
	426	return -EINVAL;
	427
	428	spin_lock(&gt->gt_spin);
	429	gt->gt_quota_scale_num = x;
	430	gt->gt_quota_scale_den = y;
	431	spin_unlock(&gt->gt_spin);
	432	return len;
	433	}
	434
	435	static ssize_t tune_set(struct gfs2_sbd sdp, unsigned int field,
	436	int check_zero, const char *buf, size_t len)
	437	{
	438	struct gfs2_tune *gt = &sdp->sd_tune;
	439	unsigned int x;
	440
	441	if (!capable(CAP_SYS_ADMIN))
	442	return -EACCES;
	443
	444	x = simple_strtoul(buf, NULL, 0);
	445
	446	if (check_zero && !x)
	447	return -EINVAL;
	448
	449	spin_lock(&gt->gt_spin);
	450	*field = x;
	451	spin_unlock(&gt->gt_spin);
	452	return len;
	453	}
	454
b3b94faa	455	#define TUNE_ATTR_3(name, show, store) \
48c2b613	456	static struct gfs2_attr tune_attr_##name = __ATTR(name, 0644, show, store)
b3b94faa DT	457
	458	#define TUNE_ATTR_2(name, store) \
	459	static ssize_t name##_show(struct gfs2_sbd sdp, char buf) \
	460	{ \
3204a6c0	461	return snprintf(buf, PAGE_SIZE, "%u\n", sdp->sd_tune.gt_##name); \
b3b94faa DT	462	} \
	463	TUNE_ATTR_3(name, name##_show, store)
	464
	465	#define TUNE_ATTR(name, check_zero) \
	466	static ssize_t name##_store(struct gfs2_sbd sdp, const char buf, size_t len)\
	467	{ \
	468	return tune_set(sdp, &sdp->sd_tune.gt_##name, check_zero, buf, len); \
	469	} \
	470	TUNE_ATTR_2(name, name##_store)
	471
b3b94faa DT	472	TUNE_ATTR(incore_log_blocks, 0);
b3b94faa DT	473	TUNE_ATTR(log_flush_secs, 0);
b3b94faa DT	474	TUNE_ATTR(quota_warn_period, 0);
b3b94faa DT	475	TUNE_ATTR(quota_quantum, 0);
b3b94faa DT	476	TUNE_ATTR(max_readahead, 0);
b3b94faa DT	477	TUNE_ATTR(complain_secs, 0);
b3b94faa DT	478	TUNE_ATTR(statfs_slow, 0);
b3b94faa DT	479	TUNE_ATTR(new_files_jdata, 0);
b3b94faa	480	TUNE_ATTR(quota_simul_sync, 1);
b3b94faa	481	TUNE_ATTR(statfs_quantum, 1);
b3b94faa DT	482	TUNE_ATTR_3(quota_scale, quota_scale_show, quota_scale_store);
	483
	484	static struct attribute *tune_attrs[] = {
b3b94faa DT	485	&tune_attr_incore_log_blocks.attr,
b3b94faa DT	486	&tune_attr_log_flush_secs.attr,
b3b94faa DT	487	&tune_attr_quota_warn_period.attr,
b3b94faa DT	488	&tune_attr_quota_quantum.attr,
b3b94faa DT	489	&tune_attr_max_readahead.attr,
b3b94faa DT	490	&tune_attr_complain_secs.attr,
b3b94faa DT	491	&tune_attr_statfs_slow.attr,
b3b94faa DT	492	&tune_attr_quota_simul_sync.attr,
b3b94faa	493	&tune_attr_statfs_quantum.attr,
b3b94faa DT	494	&tune_attr_quota_scale.attr,
b3b94faa DT	495	&tune_attr_new_files_jdata.attr,
ea67eedb	496	NULL,
b3b94faa DT	497	};
b3b94faa DT	498
b3b94faa DT	499	static struct attribute_group tune_group = {
b3b94faa DT	500	.name = "tune",
ea67eedb	501	.attrs = tune_attrs,
b3b94faa DT	502	};
b3b94faa DT	503
f057f6cd SW	504	static struct attribute_group lock_module_group = {
	505	.name = "lock_module",
	506	.attrs = lock_module_attrs,
	507	};
	508
b3b94faa DT	509	int gfs2_sys_fs_add(struct gfs2_sbd *sdp)
b3b94faa DT	510	{
440d6da2	511	struct super_block *sb = sdp->sd_vfs;
b3b94faa	512	int error;
440d6da2 SW	513	char ro[20];
	514	char spectator[20];
	515	char *envp[] = { ro, spectator, NULL };
	516
	517	sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0);
	518	sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
b3b94faa	519
9bec101a	520	sdp->sd_kobj.kset = gfs2_kset;
901195ed GKH	521	error = kobject_init_and_add(&sdp->sd_kobj, &gfs2_ktype, NULL,
901195ed GKH	522	"%s", sdp->sd_table_name);
b3b94faa DT	523	if (error)
	524	goto fail;
	525
b3b94faa DT	526	error = sysfs_create_group(&sdp->sd_kobj, &tune_group);
b3b94faa DT	527	if (error)
f6eb5349	528	goto fail_reg;
b3b94faa	529
f057f6cd SW	530	error = sysfs_create_group(&sdp->sd_kobj, &lock_module_group);
	531	if (error)
	532	goto fail_tune;
	533
31e54b01 SW	534	error = sysfs_create_link(&sdp->sd_kobj,
	535	&disk_to_dev(sb->s_bdev->bd_disk)->kobj,
	536	"device");
	537	if (error)
	538	goto fail_lock_module;
	539
440d6da2	540	kobject_uevent_env(&sdp->sd_kobj, KOBJ_ADD, envp);
b3b94faa DT	541	return 0;
b3b94faa DT	542
31e54b01 SW	543	fail_lock_module:
31e54b01 SW	544	sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
f057f6cd SW	545	fail_tune:
f057f6cd SW	546	sysfs_remove_group(&sdp->sd_kobj, &tune_group);
a91ea69f	547	fail_reg:
197b12d6	548	kobject_put(&sdp->sd_kobj);
a91ea69f	549	fail:
65952fb4	550	fs_err(sdp, "error %d adding sysfs files", error);
b3b94faa DT	551	return error;
	552	}
	553
	554	void gfs2_sys_fs_del(struct gfs2_sbd *sdp)
	555	{
31e54b01	556	sysfs_remove_link(&sdp->sd_kobj, "device");
b3b94faa	557	sysfs_remove_group(&sdp->sd_kobj, &tune_group);
f057f6cd	558	sysfs_remove_group(&sdp->sd_kobj, &lock_module_group);
197b12d6	559	kobject_put(&sdp->sd_kobj);
b3b94faa DT	560	}
b3b94faa DT	561
fdd1062e SW	562	static int gfs2_uevent(struct kset kset, struct kobject kobj,
	563	struct kobj_uevent_env *env)
	564	{
	565	struct gfs2_sbd *sdp = container_of(kobj, struct gfs2_sbd, sd_kobj);
02e3cc70 SW	566	const u8 *uuid = sdp->sd_sb.sb_uuid;
02e3cc70 SW	567
fdd1062e SW	568	add_uevent_var(env, "LOCKTABLE=%s", sdp->sd_table_name);
fdd1062e SW	569	add_uevent_var(env, "LOCKPROTO=%s", sdp->sd_proto_name);
440d6da2 SW	570	if (!sdp->sd_args.ar_spectator)
440d6da2 SW	571	add_uevent_var(env, "JOURNALID=%u", sdp->sd_lockstruct.ls_jid);
f0b34ae6 JP	572	if (gfs2_uuid_valid(uuid))
f0b34ae6 JP	573	add_uevent_var(env, "UUID=%pUB", uuid);
fdd1062e SW	574	return 0;
	575	}
	576
	577	static struct kset_uevent_ops gfs2_uevent_ops = {
	578	.uevent = gfs2_uevent,
	579	};
	580
b3b94faa DT	581	int gfs2_sys_init(void)
b3b94faa DT	582	{
fdd1062e	583	gfs2_kset = kset_create_and_add("gfs2", &gfs2_uevent_ops, fs_kobj);
9bec101a GKH	584	if (!gfs2_kset)
	585	return -ENOMEM;
	586	return 0;
b3b94faa DT	587	}
	588
	589	void gfs2_sys_uninit(void)
	590	{
9bec101a	591	kset_unregister(gfs2_kset);
b3b94faa DT	592	}
b3b94faa DT	593