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/* 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 */
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