/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * RDMA Network Block Driver
 *
 * Copyright (c) 2014 - 2018 ProfitBricks GmbH. All rights reserved.
 * Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved.
 * Copyright (c) 2019 - 2020 1&1 IONOS SE. All rights reserved.
 */
#ifndef RNBD_SRV_DEV_H
#define RNBD_SRV_DEV_H

#include <linux/fs.h>
#include "rnbd-proto.h"

struct rnbd_dev {
	struct block_device	*bdev;
	struct bio_set		*ibd_bio_set;
	fmode_t			blk_open_flags;
	char			name[BDEVNAME_SIZE];
};

struct rnbd_dev_blk_io {
	struct rnbd_dev *dev;
	void		 *priv;
	/* have to be last member for front_pad usage of bioset_init */
	struct bio	bio;
};

/**
 * rnbd_dev_open() - Open a device
 * @flags:	open flags
 * @bs:		bio_set to use during block io,
 */
struct rnbd_dev *rnbd_dev_open(const char *path, fmode_t flags,
			       struct bio_set *bs);

/**
 * rnbd_dev_close() - Close a device
 */
void rnbd_dev_close(struct rnbd_dev *dev);

void rnbd_endio(void *priv, int error);

static inline int rnbd_dev_get_max_segs(const struct rnbd_dev *dev)
{
	return queue_max_segments(bdev_get_queue(dev->bdev));
}

static inline int rnbd_dev_get_max_hw_sects(const struct rnbd_dev *dev)
{
	return queue_max_hw_sectors(bdev_get_queue(dev->bdev));
}

static inline int rnbd_dev_get_secure_discard(const struct rnbd_dev *dev)
{
	return blk_queue_secure_erase(bdev_get_queue(dev->bdev));
}

static inline int rnbd_dev_get_max_discard_sects(const struct rnbd_dev *dev)
{
	if (!blk_queue_discard(bdev_get_queue(dev->bdev)))
		return 0;

	return blk_queue_get_max_sectors(bdev_get_queue(dev->bdev),
					 REQ_OP_DISCARD);
}

static inline int rnbd_dev_get_discard_granularity(const struct rnbd_dev *dev)
{
	return bdev_get_queue(dev->bdev)->limits.discard_granularity;
}

static inline int rnbd_dev_get_discard_alignment(const struct rnbd_dev *dev)
{
	return bdev_get_queue(dev->bdev)->limits.discard_alignment;
}

/**
 * rnbd_dev_submit_io() - Submit an I/O to the disk
 * @dev:	device to that the I/O is submitted
 * @sector:	address to read/write data to
 * @data:	I/O data to write or buffer to read I/O date into
 * @len:	length of @data
 * @bi_size:	Amount of data that will be read/written
 * @prio:       IO priority
 * @priv:	private data passed to @io_fn
 */
int rnbd_dev_submit_io(struct rnbd_dev *dev, sector_t sector, void *data,
			size_t len, u32 bi_size, enum rnbd_io_flags flags,
			short prio, void *priv);

#endif /* RNBD_SRV_DEV_H */