tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
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
44static inline int rnbd_dev_get_max_segs(const struct rnbd_dev *dev)
45{
46 return queue_max_segments(bdev_get_queue(dev->bdev));
47}
48
49static inline int rnbd_dev_get_max_hw_sects(const struct rnbd_dev *dev)
50{
51 return queue_max_hw_sectors(bdev_get_queue(dev->bdev));
52}
53
54static inline int rnbd_dev_get_secure_discard(const struct rnbd_dev *dev)
55{
56 return blk_queue_secure_erase(bdev_get_queue(dev->bdev));
57}
58
59static inline int rnbd_dev_get_max_discard_sects(const struct rnbd_dev *dev)
60{
61 if (!blk_queue_discard(bdev_get_queue(dev->bdev)))
62 return 0;
63
64 return blk_queue_get_max_sectors(bdev_get_queue(dev->bdev),
65 REQ_OP_DISCARD);
66}
67
68static inline int rnbd_dev_get_discard_granularity(const struct rnbd_dev *dev)
69{
70 return bdev_get_queue(dev->bdev)->limits.discard_granularity;
71}
72
73static inline int rnbd_dev_get_discard_alignment(const struct rnbd_dev *dev)
74{
75 return bdev_get_queue(dev->bdev)->limits.discard_alignment;
76}
77
78/**
79 * rnbd_dev_submit_io() - Submit an I/O to the disk
80 * @dev: device to that the I/O is submitted
81 * @sector: address to read/write data to
82 * @data: I/O data to write or buffer to read I/O date into
83 * @len: length of @data
84 * @bi_size: Amount of data that will be read/written
85 * @prio: IO priority
86 * @priv: private data passed to @io_fn
87 */
88int rnbd_dev_submit_io(struct rnbd_dev *dev, sector_t sector, void *data,
89 size_t len, u32 bi_size, enum rnbd_io_flags flags,
90 short prio, void *priv);
91
92#endif /* RNBD_SRV_DEV_H */