/*
 * 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/version.h>
#include <asm/statfs.h>
#include <lprocfs_status.h>
#include <obd_class.h>
#include <lustre_param.h>
#include "lov_internal.h"

#ifdef CONFIG_PROC_FS
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 != NULL);
	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;
	__s64 val;
	int rc;

	LASSERT(dev != NULL);
	desc = &dev->u.lov.desc;
	rc = lprocfs_str_to_s64(buffer, count, &val);
	if (rc)
		return rc;
	if (val < 0)
		return -ERANGE;

	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 != NULL);
	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;
	__s64 val;
	int rc;

	LASSERT(dev != NULL);
	desc = &dev->u.lov.desc;
	rc = lprocfs_str_to_s64(buffer, count, &val);
	if (rc)
		return rc;
	if (val < 0)
		return -ERANGE;

	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 != NULL);
	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 pattern, rc;
	__s64 val;

	LASSERT(dev != NULL);
	desc = &dev->u.lov.desc;
	rc = lprocfs_str_to_s64(buffer, count, &val);
	if (rc)
		return rc;
	if (val < INT_MIN || val > INT_MAX)
		return -ERANGE;

	pattern = val;
	lov_fix_desc_pattern(&pattern);
	desc->ld_pattern = pattern;

	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 != NULL);
	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 rc;
	__u32 stripe_count;
	__s64 val;

	LASSERT(dev != NULL);
	desc = &dev->u.lov.desc;
	rc = lprocfs_str_to_s64(buffer, count, &val);
	if (rc)
		return rc;
	if (val < 0)
		return -ERANGE;

	stripe_count = val;
	lov_fix_desc_stripe_count(&stripe_count);
	desc->ld_default_stripe_count = stripe_count;

	return count;
}
LPROC_SEQ_FOPS(lov_stripecount);

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

	LASSERT(dev != NULL);
	desc = &dev->u.lov.desc;
	seq_printf(m, "%u\n", desc->ld_tgt_count);
	return 0;
}
LPROC_SEQ_FOPS_RO(lov_numobd);

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

	LASSERT(dev != NULL);
	desc = &dev->u.lov.desc;
	seq_printf(m, "%u\n", desc->ld_active_tgt_count);
	return 0;
}
LPROC_SEQ_FOPS_RO(lov_activeobd);

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

	LASSERT(dev != NULL);
	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 = LPROCFS_ENTRY_CHECK(inode);
	if (rc < 0)
		return rc;

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

	seq = file->private_data;
	seq->private = PDE_DATA(inode);
	return 0;
}

LPROC_SEQ_FOPS_RO_TYPE(lov, uuid);
LPROC_SEQ_FOPS_RO_TYPE(lov, filestotal);
LPROC_SEQ_FOPS_RO_TYPE(lov, filesfree);
LPROC_SEQ_FOPS_RO_TYPE(lov, blksize);
LPROC_SEQ_FOPS_RO_TYPE(lov, kbytestotal);
LPROC_SEQ_FOPS_RO_TYPE(lov, kbytesfree);
LPROC_SEQ_FOPS_RO_TYPE(lov, kbytesavail);

struct lprocfs_vars lprocfs_lov_obd_vars[] = {
	{ .name	=	"uuid",
	  .fops	=	&lov_uuid_fops		},
	{ .name	=	"stripesize",
	  .fops	=	&lov_stripesize_fops	},
	{ .name	=	"stripeoffset",
	  .fops	=	&lov_stripeoffset_fops	},
	{ .name	=	"stripecount",
	  .fops	=	&lov_stripecount_fops	},
	{ .name	=	"stripetype",
	  .fops	=	&lov_stripetype_fops	},
	{ .name	=	"numobd",
	  .fops	=	&lov_numobd_fops	},
	{ .name	=	"activeobd",
	  .fops	=	&lov_activeobd_fops	},
	{ .name	=	"filestotal",
	  .fops	=	&lov_filestotal_fops	},
	{ .name	=	"filesfree",
	  .fops	=	&lov_filesfree_fops	},
	{ .name	=	"blocksize",
	  .fops	=	&lov_blksize_fops	},
	{ .name	=	"kbytestotal",
	  .fops	=	&lov_kbytestotal_fops	},
	{ .name	=	"kbytesfree",
	  .fops	=	&lov_kbytesfree_fops	},
	{ .name	=	"kbytesavail",
	  .fops	=	&lov_kbytesavail_fops	},
	{ .name	=	"desc_uuid",
	  .fops	=	&lov_desc_uuid_fops	},
	{ NULL }
};

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,
};
#endif /* CONFIG_PROC_FS */