mirror of
https://github.com/schoebel/mars
synced 2024-12-13 18:25:46 +00:00
96 lines
2.0 KiB
C
96 lines
2.0 KiB
C
// (c) 2010 Thomas Schoebel-Theuer / 1&1 Internet AG
|
|
#ifndef MARS_IF_H
|
|
#define MARS_IF_H
|
|
|
|
#include <linux/semaphore.h>
|
|
|
|
#define HT_SHIFT 6 //????
|
|
#define MARS_MAX_SEGMENT_SIZE (1U << (9+HT_SHIFT))
|
|
|
|
#define MAX_BIO 32
|
|
|
|
//#define USE_TIMER (HZ/10) // use this ONLY for debugging
|
|
|
|
///////////////////////// global tuning ////////////////////////
|
|
|
|
extern int if_throttle_start_size; // in kb
|
|
extern struct mars_limiter if_throttle;
|
|
|
|
/////////////////////////////////////////////////
|
|
|
|
/* I don't want to enhance / intrude into struct bio for compatibility reasons
|
|
* (support for a variety of kernel versions).
|
|
* The following is just a silly workaround which could be removed again.
|
|
*/
|
|
struct bio_wrapper {
|
|
struct bio *bio;
|
|
atomic_t bi_comp_cnt;
|
|
unsigned long start_time;
|
|
};
|
|
|
|
struct if_mref_aspect {
|
|
GENERIC_ASPECT(mref);
|
|
struct list_head plug_head;
|
|
struct list_head hash_head;
|
|
int hash_index;
|
|
int bio_count;
|
|
int current_len;
|
|
int max_len;
|
|
struct page *orig_page;
|
|
struct bio_wrapper *orig_biow[MAX_BIO];
|
|
struct if_input *input;
|
|
};
|
|
|
|
struct if_hash_anchor;
|
|
|
|
struct if_input {
|
|
MARS_INPUT(if);
|
|
// TODO: move this to if_brick (better systematics)
|
|
struct list_head plug_anchor;
|
|
struct request_queue *q;
|
|
struct gendisk *disk;
|
|
struct block_device *bdev;
|
|
#ifdef USE_TIMER
|
|
struct timer_list timer;
|
|
#endif
|
|
loff_t capacity;
|
|
atomic_t plugged_count;
|
|
atomic_t flying_count;
|
|
// only for statistics
|
|
atomic_t read_flying_count;
|
|
atomic_t write_flying_count;
|
|
atomic_t total_reada_count;
|
|
atomic_t total_read_count;
|
|
atomic_t total_write_count;
|
|
atomic_t total_empty_count;
|
|
atomic_t total_fire_count;
|
|
atomic_t total_skip_sync_count;
|
|
atomic_t total_mref_read_count;
|
|
atomic_t total_mref_write_count;
|
|
spinlock_t req_lock;
|
|
struct semaphore kick_sem;
|
|
struct if_hash_anchor *hash_table;
|
|
};
|
|
|
|
struct if_output {
|
|
MARS_OUTPUT(if);
|
|
};
|
|
|
|
struct if_brick {
|
|
MARS_BRICK(if);
|
|
// parameters
|
|
loff_t dev_size;
|
|
int max_plugged;
|
|
int readahead;
|
|
bool skip_sync;
|
|
// inspectable
|
|
atomic_t open_count;
|
|
// private
|
|
struct semaphore switch_sem;
|
|
struct say_channel *say_channel;
|
|
};
|
|
|
|
MARS_TYPES(if);
|
|
|
|
#endif
|