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null_blk: move shared definitions to header file
Split the null_blk device driver, such that it can prepare for zoned block interface support. Signed-off-by: Matias Bjørling <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,80 @@ | ||
| /* SPDX-License-Identifier: GPL-2.0 */ | ||
| #ifndef __BLK_NULL_BLK_H | ||
| #define __BLK_NULL_BLK_H | ||
|
|
||
| #include <linux/blkdev.h> | ||
| #include <linux/slab.h> | ||
| #include <linux/blk-mq.h> | ||
| #include <linux/hrtimer.h> | ||
| #include <linux/configfs.h> | ||
| #include <linux/badblocks.h> | ||
| #include <linux/fault-inject.h> | ||
|
|
||
| struct nullb_cmd { | ||
| struct list_head list; | ||
| struct llist_node ll_list; | ||
| struct __call_single_data csd; | ||
| struct request *rq; | ||
| struct bio *bio; | ||
| unsigned int tag; | ||
| blk_status_t error; | ||
| struct nullb_queue *nq; | ||
| struct hrtimer timer; | ||
| }; | ||
|
|
||
| struct nullb_queue { | ||
| unsigned long *tag_map; | ||
| wait_queue_head_t wait; | ||
| unsigned int queue_depth; | ||
| struct nullb_device *dev; | ||
| unsigned int requeue_selection; | ||
|
|
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| struct nullb_cmd *cmds; | ||
| }; | ||
|
|
||
| struct nullb_device { | ||
| struct nullb *nullb; | ||
| struct config_item item; | ||
| struct radix_tree_root data; /* data stored in the disk */ | ||
| struct radix_tree_root cache; /* disk cache data */ | ||
| unsigned long flags; /* device flags */ | ||
| unsigned int curr_cache; | ||
| struct badblocks badblocks; | ||
|
|
||
| unsigned long size; /* device size in MB */ | ||
| unsigned long completion_nsec; /* time in ns to complete a request */ | ||
| unsigned long cache_size; /* disk cache size in MB */ | ||
| unsigned int submit_queues; /* number of submission queues */ | ||
| unsigned int home_node; /* home node for the device */ | ||
| unsigned int queue_mode; /* block interface */ | ||
| unsigned int blocksize; /* block size */ | ||
| unsigned int irqmode; /* IRQ completion handler */ | ||
| unsigned int hw_queue_depth; /* queue depth */ | ||
| unsigned int index; /* index of the disk, only valid with a disk */ | ||
| unsigned int mbps; /* Bandwidth throttle cap (in MB/s) */ | ||
| bool blocking; /* blocking blk-mq device */ | ||
| bool use_per_node_hctx; /* use per-node allocation for hardware context */ | ||
| bool power; /* power on/off the device */ | ||
| bool memory_backed; /* if data is stored in memory */ | ||
| bool discard; /* if support discard */ | ||
| }; | ||
|
|
||
| struct nullb { | ||
| struct nullb_device *dev; | ||
| struct list_head list; | ||
| unsigned int index; | ||
| struct request_queue *q; | ||
| struct gendisk *disk; | ||
| struct blk_mq_tag_set *tag_set; | ||
| struct blk_mq_tag_set __tag_set; | ||
| unsigned int queue_depth; | ||
| atomic_long_t cur_bytes; | ||
| struct hrtimer bw_timer; | ||
| unsigned long cache_flush_pos; | ||
| spinlock_t lock; | ||
|
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||
| struct nullb_queue *queues; | ||
| unsigned int nr_queues; | ||
| char disk_name[DISK_NAME_LEN]; | ||
| }; | ||
| #endif /* __NULL_BLK_H */ |