/*
 * GPL HEADER START
 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 only,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License version 2 for more details (a copy is included
 * in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU General Public License
 * version 2 along with this program; If not, see
 * http://www.gnu.org/licenses/gpl-2.0.html
 *
 * GPL HEADER END
 */
/*
 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
 * Use is subject to license terms.
 *
 * Copyright (c) 2012, 2015 Intel Corporation.
 */
/*
 * This file is part of Lustre, http://www.lustre.org/
 * Lustre is a trademark of Sun Microsystems, Inc.
 */
#define DEBUG_SUBSYSTEM S_CLASS

#include <linux/statfs.h>
#include <lprocfs_status.h>
#include <obd_class.h>
#include <linux/seq_file.h>
#include "lov_internal.h"

static int lov_stripesize_seq_show(struct seq_file *m, void *v)
{
	struct obd_device *dev = (struct obd_device *)m->private;
	struct lov_desc *desc;

	LASSERT(dev);
	desc = &dev->u.lov.desc;
	seq_printf(m, "%llu\n", desc->ld_default_stripe_size);
	return 0;
}

static ssize_t lov_stripesize_seq_write(struct file *file,
					const char __user *buffer,
					size_t count, loff_t *off)
{
	struct obd_device *dev = ((struct seq_file *)file->private_data)->private;
	struct lov_desc *desc;
	__u64 val;
	int rc;

	LASSERT(dev);
	desc = &dev->u.lov.desc;
	rc = lprocfs_write_u64_helper(buffer, count, &val);
	if (rc)
		return rc;

	lov_fix_desc_stripe_size(&val);
	desc->ld_default_stripe_size = val;
	return count;
}

LPROC_SEQ_FOPS(lov_stripesize);

static int lov_stripeoffset_seq_show(struct seq_file *m, void *v)
{
	struct obd_device *dev = (struct obd_device *)m->private;
	struct lov_desc *desc;

	LASSERT(dev);
	desc = &dev->u.lov.desc;
	seq_printf(m, "%llu\n", desc->ld_default_stripe_offset);
	return 0;
}

static ssize_t lov_stripeoffset_seq_write(struct file *file,
					  const char __user *buffer,
					  size_t count, loff_t *off)
{
	struct obd_device *dev = ((struct seq_file *)file->private_data)->private;
	struct lov_desc *desc;
	__u64 val;
	int rc;

	LASSERT(dev);
	desc = &dev->u.lov.desc;
	rc = lprocfs_write_u64_helper(buffer, count, &val);
	if (rc)
		return rc;

	desc->ld_default_stripe_offset = val;
	return count;
}

LPROC_SEQ_FOPS(lov_stripeoffset);

static int lov_stripetype_seq_show(struct seq_file *m, void *v)
{
	struct obd_device *dev = (struct obd_device *)m->private;
	struct lov_desc *desc;

	LASSERT(dev);
	desc = &dev->u.lov.desc;
	seq_printf(m, "%u\n", desc->ld_pattern);
	return 0;
}

static ssize_t lov_stripetype_seq_write(struct file *file,
					const char __user *buffer,
					size_t count, loff_t *off)
{
	struct obd_device *dev = ((struct seq_file *)file->private_data)->private;
	struct lov_desc *desc;
	int val, rc;

	LASSERT(dev);
	desc = &dev->u.lov.desc;
	rc = lprocfs_write_helper(buffer, count, &val);
	if (rc)
		return rc;

	lov_fix_desc_pattern(&val);
	desc->ld_pattern = val;
	return count;
}

LPROC_SEQ_FOPS(lov_stripetype);

static int lov_stripecount_seq_show(struct seq_file *m, void *v)
{
	struct obd_device *dev = (struct obd_device *)m->private;
	struct lov_desc *desc;

	LASSERT(dev);
	desc = &dev->u.lov.desc;
	seq_printf(m, "%d\n", (__s16)(desc->ld_default_stripe_count + 1) - 1);
	return 0;
}

static ssize_t lov_stripecount_seq_write(struct file *file,
					 const char __user *buffer,
					 size_t count, loff_t *off)
{
	struct obd_device *dev = ((struct seq_file *)file->private_data)->private;
	struct lov_desc *desc;
	int val, rc;

	LASSERT(dev);
	desc = &dev->u.lov.desc;
	rc = lprocfs_write_helper(buffer, count, &val);
	if (rc)
		return rc;

	lov_fix_desc_stripe_count(&val);
	desc->ld_default_stripe_count = val;
	return count;
}

LPROC_SEQ_FOPS(lov_stripecount);

static ssize_t numobd_show(struct kobject *kobj, struct attribute *attr,
			   char *buf)
{
	struct obd_device *dev = container_of(kobj, struct obd_device,
					      obd_kobj);
	struct lov_desc *desc;

	desc = &dev->u.lov.desc;
	return sprintf(buf, "%u\n", desc->ld_tgt_count);
}
LUSTRE_RO_ATTR(numobd);

static ssize_t activeobd_show(struct kobject *kobj, struct attribute *attr,
			      char *buf)
{
	struct obd_device *dev = container_of(kobj, struct obd_device,
					      obd_kobj);
	struct lov_desc *desc;

	desc = &dev->u.lov.desc;
	return sprintf(buf, "%u\n", desc->ld_active_tgt_count);
}
LUSTRE_RO_ATTR(activeobd);

static int lov_desc_uuid_seq_show(struct seq_file *m, void *v)
{
	struct obd_device *dev = (struct obd_device *)m->private;
	struct lov_obd *lov;

	LASSERT(dev);
	lov = &dev->u.lov;
	seq_printf(m, "%s\n", lov->desc.ld_uuid.uuid);
	return 0;
}

LPROC_SEQ_FOPS_RO(lov_desc_uuid);

static void *lov_tgt_seq_start(struct seq_file *p, loff_t *pos)
{
	struct obd_device *dev = p->private;
	struct lov_obd *lov = &dev->u.lov;

	while (*pos < lov->desc.ld_tgt_count) {
		if (lov->lov_tgts[*pos])
			return lov->lov_tgts[*pos];
		++*pos;
	}
	return NULL;
}

static void lov_tgt_seq_stop(struct seq_file *p, void *v)
{
}

static void *lov_tgt_seq_next(struct seq_file *p, void *v, loff_t *pos)
{
	struct obd_device *dev = p->private;
	struct lov_obd *lov = &dev->u.lov;

	while (++*pos < lov->desc.ld_tgt_count) {
		if (lov->lov_tgts[*pos])
			return lov->lov_tgts[*pos];
	}
	return NULL;
}

static int lov_tgt_seq_show(struct seq_file *p, void *v)
{
	struct lov_tgt_desc *tgt = v;

	seq_printf(p, "%d: %s %sACTIVE\n",
		   tgt->ltd_index, obd_uuid2str(&tgt->ltd_uuid),
		   tgt->ltd_active ? "" : "IN");
	return 0;
}

static const struct seq_operations lov_tgt_sops = {
	.start = lov_tgt_seq_start,
	.stop = lov_tgt_seq_stop,
	.next = lov_tgt_seq_next,
	.show = lov_tgt_seq_show,
};

static int lov_target_seq_open(struct inode *inode, struct file *file)
{
	struct seq_file *seq;
	int rc;

	rc = seq_open(file, &lov_tgt_sops);
	if (rc)
		return rc;

	seq = file->private_data;
	seq->private = inode->i_private;
	return 0;
}

static struct lprocfs_vars lprocfs_lov_obd_vars[] = {
	{ "stripesize",   &lov_stripesize_fops,   NULL },
	{ "stripeoffset", &lov_stripeoffset_fops, NULL },
	{ "stripecount",  &lov_stripecount_fops,  NULL },
	{ "stripetype",   &lov_stripetype_fops,   NULL },
	/*{ "filegroups", lprocfs_rd_filegroups,  NULL, 0 },*/
	{ "desc_uuid",    &lov_desc_uuid_fops,    NULL, 0 },
	{ NULL }
};

static struct attribute *lov_attrs[] = {
	&lustre_attr_activeobd.attr,
	&lustre_attr_numobd.attr,
	NULL,
};

static const struct attribute_group lov_attr_group = {
	.attrs = lov_attrs,
};

void lprocfs_lov_init_vars(struct lprocfs_static_vars *lvars)
{
	lvars->sysfs_vars = &lov_attr_group;
	lvars->obd_vars = lprocfs_lov_obd_vars;
}

const struct file_operations lov_proc_target_fops = {
	.owner   = THIS_MODULE,
	.open    = lov_target_seq_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
	.release = lprocfs_seq_release,
};