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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 | #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 | ||
13 | struct 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 | ||
25 | struct 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 | ||
35 | struct 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 | ||
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44 | unsigned int nr_zones; |
45 | struct blk_zone *zones; | |
46 | sector_t zone_size_sects; | |
47 | ||
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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 */ | |
ca4b2a01 | 51 | unsigned long zone_size; /* zone size in MB if device is zoned */ |
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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 */ | |
ca4b2a01 | 65 | bool zoned; /* if device is zoned */ |
6dad38d3 MB |
66 | }; |
67 | ||
68 | struct 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 | }; | |
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86 | |
87 | #ifdef CONFIG_BLK_DEV_ZONED | |
88 | int null_zone_init(struct nullb_device *dev); | |
89 | void null_zone_exit(struct nullb_device *dev); | |
b228ba1c JA |
90 | blk_status_t null_zone_report(struct nullb *nullb, struct bio *bio); |
91 | void null_zone_write(struct nullb_cmd *cmd, sector_t sector, | |
92 | unsigned int nr_sectors); | |
93 | void null_zone_reset(struct nullb_cmd *cmd, sector_t sector); | |
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94 | #else |
95 | static inline int null_zone_init(struct nullb_device *dev) | |
96 | { | |
97 | return -EINVAL; | |
98 | } | |
99 | static inline void null_zone_exit(struct nullb_device *dev) {} | |
100 | static inline blk_status_t null_zone_report(struct nullb *nullb, | |
b228ba1c | 101 | struct bio *bio) |
ca4b2a01 MB |
102 | { |
103 | return BLK_STS_NOTSUPP; | |
104 | } | |
b228ba1c JA |
105 | static inline void null_zone_write(struct nullb_cmd *cmd, sector_t sector, |
106 | unsigned int nr_sectors) | |
107 | { | |
108 | } | |
109 | static inline void null_zone_reset(struct nullb_cmd *cmd, sector_t sector) {} | |
ca4b2a01 | 110 | #endif /* CONFIG_BLK_DEV_ZONED */ |
6dad38d3 | 111 | #endif /* __NULL_BLK_H */ |