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 */
2#ifndef __BLK_NULL_BLK_H
3#define __BLK_NULL_BLK_H
4
5#include <linux/blkdev.h>
6#include <linux/slab.h>
7#include <linux/blk-mq.h>
8#include <linux/hrtimer.h>
9#include <linux/configfs.h>
10#include <linux/badblocks.h>
11#include <linux/fault-inject.h>
12
13struct nullb_cmd {
14 struct list_head list;
15 struct llist_node ll_list;
16 struct __call_single_data csd;
17 struct request *rq;
18 struct bio *bio;
19 unsigned int tag;
20 blk_status_t error;
21 struct nullb_queue *nq;
22 struct hrtimer timer;
23};
24
25struct nullb_queue {
26 unsigned long *tag_map;
27 wait_queue_head_t wait;
28 unsigned int queue_depth;
29 struct nullb_device *dev;
30 unsigned int requeue_selection;
31
32 struct nullb_cmd *cmds;
33};
34
35struct nullb_device {
36 struct nullb *nullb;
37 struct config_item item;
38 struct radix_tree_root data; /* data stored in the disk */
39 struct radix_tree_root cache; /* disk cache data */
40 unsigned long flags; /* device flags */
41 unsigned int curr_cache;
42 struct badblocks badblocks;
43
44 unsigned int nr_zones;
45 struct blk_zone *zones;
46 sector_t zone_size_sects;
47
48 unsigned long size; /* device size in MB */
49 unsigned long completion_nsec; /* time in ns to complete a request */
50 unsigned long cache_size; /* disk cache size in MB */
51 unsigned long zone_size; /* zone size in MB if device is zoned */
52 unsigned int submit_queues; /* number of submission queues */
53 unsigned int home_node; /* home node for the device */
54 unsigned int queue_mode; /* block interface */
55 unsigned int blocksize; /* block size */
56 unsigned int irqmode; /* IRQ completion handler */
57 unsigned int hw_queue_depth; /* queue depth */
58 unsigned int index; /* index of the disk, only valid with a disk */
59 unsigned int mbps; /* Bandwidth throttle cap (in MB/s) */
60 bool blocking; /* blocking blk-mq device */
61 bool use_per_node_hctx; /* use per-node allocation for hardware context */
62 bool power; /* power on/off the device */
63 bool memory_backed; /* if data is stored in memory */
64 bool discard; /* if support discard */
65 bool zoned; /* if device is zoned */
66};
67
68struct nullb {
69 struct nullb_device *dev;
70 struct list_head list;
71 unsigned int index;
72 struct request_queue *q;
73 struct gendisk *disk;
74 struct blk_mq_tag_set *tag_set;
75 struct blk_mq_tag_set __tag_set;
76 unsigned int queue_depth;
77 atomic_long_t cur_bytes;
78 struct hrtimer bw_timer;
79 unsigned long cache_flush_pos;
80 spinlock_t lock;
81
82 struct nullb_queue *queues;
83 unsigned int nr_queues;
84 char disk_name[DISK_NAME_LEN];
85};
86
87#ifdef CONFIG_BLK_DEV_ZONED
88int null_zone_init(struct nullb_device *dev);
89void null_zone_exit(struct nullb_device *dev);
90blk_status_t null_zone_report(struct nullb *nullb, struct bio *bio);
91void null_zone_write(struct nullb_cmd *cmd, sector_t sector,
92 unsigned int nr_sectors);
93void null_zone_reset(struct nullb_cmd *cmd, sector_t sector);
94#else
95static inline int null_zone_init(struct nullb_device *dev)
96{
97 return -EINVAL;
98}
99static inline void null_zone_exit(struct nullb_device *dev) {}
100static inline blk_status_t null_zone_report(struct nullb *nullb,
101 struct bio *bio)
102{
103 return BLK_STS_NOTSUPP;
104}
105static inline void null_zone_write(struct nullb_cmd *cmd, sector_t sector,
106 unsigned int nr_sectors)
107{
108}
109static inline void null_zone_reset(struct nullb_cmd *cmd, sector_t sector) {}
110#endif /* CONFIG_BLK_DEV_ZONED */
111#endif /* __NULL_BLK_H */