/* SPDX-License-Identifier: GPL-2.0 */#ifndef __BLK_NULL_BLK_H#define __BLK_NULL_BLK_H #undef pr_fmt#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #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>#include <linux/spinlock.h>#include <linux/mutex.h> struct nullb_cmd {	blk_status_t error;	bool fake_timeout;	struct nullb_queue *nq;	struct hrtimer timer;}; struct nullb_queue {	struct nullb_device *dev;	unsigned int requeue_selection; 	struct list_head poll_list;	spinlock_t poll_lock;}; struct nullb_zone {	/*	 * Zone lock to prevent concurrent modification of a zone write	 * pointer position and condition: with memory backing, a write	 * command execution may sleep on memory allocation. For this case,	 * use mutex as the zone lock. Otherwise, use the spinlock for	 * locking the zone.	 */	union {		spinlock_t spinlock;		struct mutex mutex;	};	enum blk_zone_type type;	enum blk_zone_cond cond;	sector_t start;	sector_t wp;	unsigned int len;	unsigned int capacity;}; struct nullb_device {	struct nullb *nullb;	struct config_group group;#ifdef CONFIG_BLK_DEV_NULL_BLK_FAULT_INJECTION	struct fault_config timeout_config;	struct fault_config requeue_config;	struct fault_config init_hctx_fault_config;#endif	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;	bool badblocks_once;	bool badblocks_partial_io; 	unsigned int nr_zones;	unsigned int nr_zones_imp_open;	unsigned int nr_zones_exp_open;	unsigned int nr_zones_closed;	unsigned int imp_close_zone_no;	struct nullb_zone *zones;	sector_t zone_size_sects;	bool need_zone_res_mgmt;	spinlock_t zone_res_lock; 	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 long zone_size; /* zone size in MB if device is zoned */	unsigned long zone_capacity; /* zone capacity in MB if device is zoned */	unsigned int zone_nr_conv; /* number of conventional zones */	unsigned int zone_max_open; /* max number of open zones */	unsigned int zone_max_active; /* max number of active zones */	unsigned int zone_append_max_sectors; /* Max sectors per zone append command */	unsigned int submit_queues; /* number of submission queues */	unsigned int prev_submit_queues; /* number of submission queues before change */	unsigned int poll_queues; /* number of IOPOLL submission queues */	unsigned int prev_poll_queues; /* number of IOPOLL submission queues before change */	unsigned int home_node; /* home node for the device */	unsigned int queue_mode; /* block interface */	unsigned int blocksize; /* block size */	unsigned int max_sectors; /* Max sectors per command */	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 */	bool zoned; /* if device is zoned */	bool zone_full; /* Initialize zones to be full */	bool virt_boundary; /* virtual boundary on/off for the device */	bool no_sched; /* no IO scheduler for the device */	bool shared_tags; /* share tag set between devices for blk-mq */	bool shared_tag_bitmap; /* use hostwide shared tags */	bool fua; /* Support FUA */	bool rotational; /* Fake rotational device */}; 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;	atomic_long_t cur_bytes;	struct hrtimer bw_timer;	unsigned long cache_flush_pos;	spinlock_t lock; 	struct nullb_queue *queues;	char disk_name[DISK_NAME_LEN];}; blk_status_t null_handle_discard(struct nullb_device *dev, sector_t sector,				 sector_t nr_sectors);blk_status_t null_process_cmd(struct nullb_cmd *cmd, enum req_op op,			      sector_t sector, unsigned int nr_sectors);blk_status_t null_handle_badblocks(struct nullb_cmd *cmd, sector_t sector,				   unsigned int *nr_sectors);blk_status_t null_handle_memory_backed(struct nullb_cmd *cmd, enum req_op op,				       sector_t sector, sector_t nr_sectors); #ifdef CONFIG_BLK_DEV_ZONEDint null_init_zoned_dev(struct nullb_device *dev, struct queue_limits *lim);int null_register_zoned_dev(struct nullb *nullb);void null_free_zoned_dev(struct nullb_device *dev);int null_report_zones(struct gendisk *disk, sector_t sector,		      unsigned int nr_zones,		      struct blk_report_zones_args *args);blk_status_t null_process_zoned_cmd(struct nullb_cmd *cmd, enum req_op op,				    sector_t sector, sector_t nr_sectors);size_t null_zone_valid_read_len(struct nullb *nullb,				sector_t sector, unsigned int len);ssize_t zone_cond_store(struct nullb_device *dev, const char *page,			size_t count, enum blk_zone_cond cond);#elsestatic inline int null_init_zoned_dev(struct nullb_device *dev,		struct queue_limits *lim){	pr_err("CONFIG_BLK_DEV_ZONED not enabled\n");	return -EINVAL;}static inline int null_register_zoned_dev(struct nullb *nullb){	return -ENODEV;}static inline void null_free_zoned_dev(struct nullb_device *dev) {}static inline blk_status_t null_process_zoned_cmd(struct nullb_cmd *cmd,			enum req_op op, sector_t sector, sector_t nr_sectors){	return BLK_STS_NOTSUPP;}static inline size_t null_zone_valid_read_len(struct nullb *nullb,					      sector_t sector,					      unsigned int len){	return len;}static inline ssize_t zone_cond_store(struct nullb_device *dev,				      const char *page, size_t count,				      enum blk_zone_cond cond){	return -EOPNOTSUPP;}#define null_report_zones	NULL#endif /* CONFIG_BLK_DEV_ZONED */#endif /* __NULL_BLK_H */