mars/mars_buf.h

102 lines
2.4 KiB
C
Raw Normal View History

2010-07-07 14:09:16 +00:00
// (c) 2010 Thomas Schoebel-Theuer / 1&1 Internet AG
#ifndef MARS_BUF_H
#define MARS_BUF_H
#include <linux/list.h>
2010-07-23 11:55:18 +00:00
#include <asm/atomic.h>
2010-07-07 14:09:16 +00:00
2010-08-11 16:02:08 +00:00
//#define MARS_BUF_HASH_MAX 512
#define MARS_BUF_HASH_MAX 2048
2010-07-07 14:09:16 +00:00
2010-12-10 17:40:20 +00:00
#define LIST_FREE 0
#define LIST_FORGET 1
#define LIST_LRU 2
#define LIST_MAX 3
2010-12-15 12:13:18 +00:00
struct buf_mref_aspect {
GENERIC_ASPECT(mref);
2010-08-07 15:02:16 +00:00
struct buf_head *rfa_bf;
2010-12-10 17:40:20 +00:00
//struct list_head rfa_bf_head;
2010-08-07 15:02:16 +00:00
struct list_head rfa_pending_head;
2010-12-10 17:40:20 +00:00
//struct list_head tmp_head;
2010-08-08 14:02:54 +00:00
struct generic_callback cb;
2010-07-07 14:09:16 +00:00
};
2010-08-09 16:57:56 +00:00
struct cache_anchor {
spinlock_t hash_lock;
struct list_head hash_anchor;
};
2010-07-07 14:09:16 +00:00
struct buf_brick {
MARS_BRICK(buf);
2010-07-23 11:55:18 +00:00
/* brick parameters */
2010-07-07 14:09:16 +00:00
int backing_order;
int backing_size;
int max_count;
2010-12-10 17:40:20 +00:00
bool optimize_chains;
2010-07-23 11:55:18 +00:00
/* internals */
2010-08-07 15:02:16 +00:00
spinlock_t brick_lock;
2010-08-09 16:57:56 +00:00
atomic_t alloc_count;
2010-12-10 17:40:20 +00:00
atomic_t list_count[LIST_MAX];
2010-08-09 16:57:56 +00:00
atomic_t hashed_count;
2010-08-05 15:54:48 +00:00
atomic_t nr_io_pending;
2010-08-09 16:57:56 +00:00
atomic_t nr_collisions;
2010-08-05 15:54:48 +00:00
struct generic_object_layout mref_object_layout;
2010-11-26 13:45:10 +00:00
struct mars_info base_info;
2010-12-10 17:40:20 +00:00
bool got_info;
2010-07-07 14:09:16 +00:00
// lists for caching
2010-12-10 17:40:20 +00:00
struct list_head list_anchor[LIST_MAX]; // members are hashed and not in use
struct list_head forget_anchor; // like lru_anchor, but likely
2010-08-09 16:57:56 +00:00
struct cache_anchor cache_anchors[MARS_BUF_HASH_MAX]; // hash table
2010-07-07 14:09:16 +00:00
2010-08-05 15:54:48 +00:00
// statistics
unsigned long last_jiffies;
atomic_t hit_count;
atomic_t miss_count;
2010-12-10 17:40:20 +00:00
atomic_t opt_count;
atomic_t chain_count;
atomic_t post_count;
atomic_t write_count;
2010-08-05 15:54:48 +00:00
atomic_t io_count;
2010-07-07 14:09:16 +00:00
};
struct buf_input {
MARS_INPUT(buf);
};
struct buf_output {
MARS_OUTPUT(buf);
};
MARS_TYPES(buf);
struct buf_head {
2010-12-10 17:40:20 +00:00
void *bf_data; // this MUST come first
2010-08-07 15:02:16 +00:00
spinlock_t bf_lock;
2010-08-07 07:59:34 +00:00
struct buf_brick *bf_brick;
2010-08-07 15:02:16 +00:00
loff_t bf_pos;
2010-08-26 17:12:30 +00:00
loff_t bf_base_index;
2010-08-07 15:02:16 +00:00
int bf_flags;
2010-11-26 13:45:10 +00:00
int bf_error;
2010-12-10 17:40:20 +00:00
atomic_t bf_hash_count; // # references pinning the hash
atomic_t bf_mref_count; // # mrefs (only used for checking, no real semantics)
atomic_t bf_io_count; // # IOs in flight
// statistics / data for strategic decisions
atomic_t bf_mfu_stat;
atomic_t bf_chain_len;
bool bf_chain_detected;
2010-07-07 14:09:16 +00:00
// lists for caching
2010-08-05 15:54:48 +00:00
//struct list_head bf_mref_anchor; // all current mref members
2010-12-10 17:40:20 +00:00
struct list_head bf_list_head;
2010-08-07 15:02:16 +00:00
struct list_head bf_hash_head;
2010-12-10 17:40:20 +00:00
unsigned long bf_jiffies;
int bf_member;
2010-07-07 14:09:16 +00:00
// lists for IO
2010-08-07 15:02:16 +00:00
struct list_head bf_io_pending_anchor;
struct list_head bf_postpone_anchor;
2010-07-07 14:09:16 +00:00
};
#endif