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Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __BLK_NULL_BLK_H
3#define __BLK_NULL_BLK_H
4
5#undef pr_fmt
6#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
7
8#include <linux/blkdev.h>
9#include <linux/slab.h>
10#include <linux/blk-mq.h>
11#include <linux/hrtimer.h>
12#include <linux/configfs.h>
13#include <linux/badblocks.h>
14#include <linux/fault-inject.h>
15
16struct nullb_cmd {
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 zone_nr_conv; /* number of conventional zones */
53 unsigned int submit_queues; /* number of submission queues */
54 unsigned int home_node; /* home node for the device */
55 unsigned int queue_mode; /* block interface */
56 unsigned int blocksize; /* block size */
57 unsigned int irqmode; /* IRQ completion handler */
58 unsigned int hw_queue_depth; /* queue depth */
59 unsigned int index; /* index of the disk, only valid with a disk */
60 unsigned int mbps; /* Bandwidth throttle cap (in MB/s) */
61 bool blocking; /* blocking blk-mq device */
62 bool use_per_node_hctx; /* use per-node allocation for hardware context */
63 bool power; /* power on/off the device */
64 bool memory_backed; /* if data is stored in memory */
65 bool discard; /* if support discard */
66 bool zoned; /* if device is zoned */
67};
68
69struct nullb {
70 struct nullb_device *dev;
71 struct list_head list;
72 unsigned int index;
73 struct request_queue *q;
74 struct gendisk *disk;
75 struct blk_mq_tag_set *tag_set;
76 struct blk_mq_tag_set __tag_set;
77 unsigned int queue_depth;
78 atomic_long_t cur_bytes;
79 struct hrtimer bw_timer;
80 unsigned long cache_flush_pos;
81 spinlock_t lock;
82
83 struct nullb_queue *queues;
84 unsigned int nr_queues;
85 char disk_name[DISK_NAME_LEN];
86};
87
88blk_status_t null_process_cmd(struct nullb_cmd *cmd,
89 enum req_opf op, sector_t sector,
90 unsigned int nr_sectors);
91
92#ifdef CONFIG_BLK_DEV_ZONED
93int null_init_zoned_dev(struct nullb_device *dev, struct request_queue *q);
94int null_register_zoned_dev(struct nullb *nullb);
95void null_free_zoned_dev(struct nullb_device *dev);
96int null_report_zones(struct gendisk *disk, sector_t sector,
97 unsigned int nr_zones, report_zones_cb cb, void *data);
98blk_status_t null_process_zoned_cmd(struct nullb_cmd *cmd,
99 enum req_opf op, sector_t sector,
100 sector_t nr_sectors);
101size_t null_zone_valid_read_len(struct nullb *nullb,
102 sector_t sector, unsigned int len);
103#else
104static inline int null_init_zoned_dev(struct nullb_device *dev,
105 struct request_queue *q)
106{
107 pr_err("CONFIG_BLK_DEV_ZONED not enabled\n");
108 return -EINVAL;
109}
110static inline int null_register_zoned_dev(struct nullb *nullb)
111{
112 return -ENODEV;
113}
114static inline void null_free_zoned_dev(struct nullb_device *dev) {}
115static inline blk_status_t null_process_zoned_cmd(struct nullb_cmd *cmd,
116 enum req_opf op, sector_t sector, sector_t nr_sectors)
117{
118 return BLK_STS_NOTSUPP;
119}
120static inline size_t null_zone_valid_read_len(struct nullb *nullb,
121 sector_t sector,
122 unsigned int len)
123{
124 return len;
125}
126#define null_report_zones NULL
127#endif /* CONFIG_BLK_DEV_ZONED */
128#endif /* __NULL_BLK_H */