drivers/block/null_blk.h

   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
  44         unsigned long size; /* device size in MB */
  45         unsigned long completion_nsec; /* time in ns to complete a request */
  46         unsigned long cache_size; /* disk cache size in MB */
  47         unsigned int submit_queues; /* number of submission queues */
  48         unsigned int home_node; /* home node for the device */
  49         unsigned int queue_mode; /* block interface */
  50         unsigned int blocksize; /* block size */
  51         unsigned int irqmode; /* IRQ completion handler */
  52         unsigned int hw_queue_depth; /* queue depth */
  53         unsigned int index; /* index of the disk, only valid with a disk */
  54         unsigned int mbps; /* Bandwidth throttle cap (in MB/s) */
  55         bool blocking; /* blocking blk-mq device */
  56         bool use_per_node_hctx; /* use per-node allocation for hardware context */
  57         bool power; /* power on/off the device */
  58         bool memory_backed; /* if data is stored in memory */
  59         bool discard; /* if support discard */
  60 };
  61
  62 struct nullb {
  63         struct nullb_device *dev;
  64         struct list_head list;
  65         unsigned int index;
  66         struct request_queue *q;
  67         struct gendisk *disk;
  68         struct blk_mq_tag_set *tag_set;
  69         struct blk_mq_tag_set __tag_set;
  70         unsigned int queue_depth;
  71         atomic_long_t cur_bytes;
  72         struct hrtimer bw_timer;
  73         unsigned long cache_flush_pos;
  74         spinlock_t lock;
  75
  76         struct nullb_queue *queues;
  77         unsigned int nr_queues;
  78         char disk_name[DISK_NAME_LEN];
  79 };
  80 #endif /* __NULL_BLK_H */