1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __BLK_NULL_BLK_H
3 #define __BLK_NULL_BLK_H
6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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>
21 struct nullb_queue *nq;
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;
32 struct nullb_cmd *cmds;
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;
44 unsigned int nr_zones;
45 struct blk_zone *zones;
46 sector_t zone_size_sects;
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 long zone_capacity; /* zone capacity in MB if device is zoned */
53 unsigned int zone_nr_conv; /* number of conventional zones */
54 unsigned int submit_queues; /* number of submission queues */
55 unsigned int home_node; /* home node for the device */
56 unsigned int queue_mode; /* block interface */
57 unsigned int blocksize; /* block size */
58 unsigned int irqmode; /* IRQ completion handler */
59 unsigned int hw_queue_depth; /* queue depth */
60 unsigned int index; /* index of the disk, only valid with a disk */
61 unsigned int mbps; /* Bandwidth throttle cap (in MB/s) */
62 bool blocking; /* blocking blk-mq device */
63 bool use_per_node_hctx; /* use per-node allocation for hardware context */
64 bool power; /* power on/off the device */
65 bool memory_backed; /* if data is stored in memory */
66 bool discard; /* if support discard */
67 bool zoned; /* if device is zoned */
71 struct nullb_device *dev;
72 struct list_head list;
74 struct request_queue *q;
76 struct blk_mq_tag_set *tag_set;
77 struct blk_mq_tag_set __tag_set;
78 unsigned int queue_depth;
79 atomic_long_t cur_bytes;
80 struct hrtimer bw_timer;
81 unsigned long cache_flush_pos;
84 struct nullb_queue *queues;
85 unsigned int nr_queues;
86 char disk_name[DISK_NAME_LEN];
89 blk_status_t null_process_cmd(struct nullb_cmd *cmd,
90 enum req_opf op, sector_t sector,
91 unsigned int nr_sectors);
93 #ifdef CONFIG_BLK_DEV_ZONED
94 int null_init_zoned_dev(struct nullb_device *dev, struct request_queue *q);
95 int null_register_zoned_dev(struct nullb *nullb);
96 void null_free_zoned_dev(struct nullb_device *dev);
97 int null_report_zones(struct gendisk *disk, sector_t sector,
98 unsigned int nr_zones, report_zones_cb cb, void *data);
99 blk_status_t null_process_zoned_cmd(struct nullb_cmd *cmd,
100 enum req_opf op, sector_t sector,
101 sector_t nr_sectors);
102 size_t null_zone_valid_read_len(struct nullb *nullb,
103 sector_t sector, unsigned int len);
105 static inline int null_init_zoned_dev(struct nullb_device *dev,
106 struct request_queue *q)
108 pr_err("CONFIG_BLK_DEV_ZONED not enabled\n");
111 static inline int null_register_zoned_dev(struct nullb *nullb)
115 static inline void null_free_zoned_dev(struct nullb_device *dev) {}
116 static inline blk_status_t null_process_zoned_cmd(struct nullb_cmd *cmd,
117 enum req_opf op, sector_t sector, sector_t nr_sectors)
119 return BLK_STS_NOTSUPP;
121 static inline size_t null_zone_valid_read_len(struct nullb *nullb,
127 #define null_report_zones NULL
128 #endif /* CONFIG_BLK_DEV_ZONED */
129 #endif /* __NULL_BLK_H */