1/* SPDX-License-Identifier: GPL-2.0-or-later */
 2/*
 3 * RDMA Network Block Driver
 4 *
 5 * Copyright (c) 2014 - 2018 ProfitBricks GmbH. All rights reserved.
 6 * Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved.
 7 * Copyright (c) 2019 - 2020 1&1 IONOS SE. All rights reserved.
 8 */
 9#ifndef RNBD_SRV_DEV_H
10#define RNBD_SRV_DEV_H
11
12#include <linux/fs.h>
13#include "rnbd-proto.h"
14
15struct rnbd_dev {
16	struct block_device	*bdev;
17	struct bio_set		*ibd_bio_set;
18	fmode_t			blk_open_flags;
19	char			name[BDEVNAME_SIZE];
20};
21
22struct rnbd_dev_blk_io {
23	struct rnbd_dev *dev;
24	void		 *priv;
25	/* have to be last member for front_pad usage of bioset_init */
26	struct bio	bio;
27};
28
29/**
30 * rnbd_dev_open() - Open a device
31 * @flags:	open flags
32 * @bs:		bio_set to use during block io,
33 */
34struct rnbd_dev *rnbd_dev_open(const char *path, fmode_t flags,
35			       struct bio_set *bs);
36
37/**
38 * rnbd_dev_close() - Close a device
39 */
40void rnbd_dev_close(struct rnbd_dev *dev);
41
42void rnbd_endio(void *priv, int error);
43
44void rnbd_dev_bi_end_io(struct bio *bio);
45
46struct bio *rnbd_bio_map_kern(void *data, struct bio_set *bs,
47			      unsigned int len, gfp_t gfp_mask);
48
49static inline int rnbd_dev_get_max_segs(const struct rnbd_dev *dev)
50{
51	return queue_max_segments(bdev_get_queue(dev->bdev));
52}
53
54static inline int rnbd_dev_get_max_hw_sects(const struct rnbd_dev *dev)
55{
56	return queue_max_hw_sectors(bdev_get_queue(dev->bdev));
57}
58
59static inline int rnbd_dev_get_secure_discard(const struct rnbd_dev *dev)
60{
61	return blk_queue_secure_erase(bdev_get_queue(dev->bdev));
62}
63
64static inline int rnbd_dev_get_max_discard_sects(const struct rnbd_dev *dev)
65{
66	if (!blk_queue_discard(bdev_get_queue(dev->bdev)))
67		return 0;
68
69	return blk_queue_get_max_sectors(bdev_get_queue(dev->bdev),
70					 REQ_OP_DISCARD);
71}
72
73static inline int rnbd_dev_get_discard_granularity(const struct rnbd_dev *dev)
74{
75	return bdev_get_queue(dev->bdev)->limits.discard_granularity;
76}
77
78static inline int rnbd_dev_get_discard_alignment(const struct rnbd_dev *dev)
79{
80	return bdev_get_queue(dev->bdev)->limits.discard_alignment;
81}
82
83#endif /* RNBD_SRV_DEV_H */