Contributors: 20
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Jens Axboe |
173 |
22.79% |
7 |
14.58% |
| Shaohua Li |
151 |
19.89% |
8 |
16.67% |
| Matias Björling |
126 |
16.60% |
3 |
6.25% |
| Damien Le Moal |
111 |
14.62% |
9 |
18.75% |
| Shin'ichiro Kawasaki |
40 |
5.27% |
2 |
4.17% |
| Christoph Hellwig |
27 |
3.56% |
5 |
10.42% |
| Ajay Joshi |
26 |
3.43% |
1 |
2.08% |
| Niklas Svensson (Niklas Cassel) |
22 |
2.90% |
1 |
2.08% |
| Chaitanya Kulkarni |
19 |
2.50% |
1 |
2.08% |
| Akinobu Mita |
16 |
2.11% |
1 |
2.08% |
| André Almeida |
11 |
1.45% |
1 |
2.08% |
| Vincent Fu |
8 |
1.05% |
1 |
2.08% |
| Masato Suzuki |
5 |
0.66% |
1 |
2.08% |
| Aravind Ramesh |
5 |
0.66% |
1 |
2.08% |
| Max Gurtovoy |
4 |
0.53% |
1 |
2.08% |
| yu kuai |
4 |
0.53% |
1 |
2.08% |
| John Pittman |
4 |
0.53% |
1 |
2.08% |
| Bart Van Assche |
3 |
0.40% |
1 |
2.08% |
| Arnd Bergmann |
3 |
0.40% |
1 |
2.08% |
| Kanchan Joshi |
1 |
0.13% |
1 |
2.08% |
| Total |
759 |
|
48 |
|
/* 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 {
union {
struct request *rq;
struct bio *bio;
};
unsigned int tag;
blk_status_t error;
bool fake_timeout;
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;
struct list_head poll_list;
spinlock_t poll_lock;
struct nullb_cmd *cmds;
};
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;
};
/* Queue modes */
enum {
NULL_Q_BIO = 0,
NULL_Q_RQ = 1,
NULL_Q_MQ = 2,
};
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;
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 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 virt_boundary; /* virtual boundary on/off for the device */
bool no_sched; /* no IO scheduler for the device */
bool shared_tag_bitmap; /* use hostwide shared tags */
};
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;
struct nullb_queue *queues;
unsigned int nr_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);
#ifdef CONFIG_BLK_DEV_ZONED
int null_init_zoned_dev(struct nullb_device *dev, struct request_queue *q);
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, report_zones_cb cb, void *data);
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);
#else
static inline int null_init_zoned_dev(struct nullb_device *dev,
struct request_queue *q)
{
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 */