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https://github.com/schoebel/mars
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100 lines
2.3 KiB
C
100 lines
2.3 KiB
C
// (c) 2010 Thomas Schoebel-Theuer / 1&1 Internet AG
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#ifndef MARS_BUF_H
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#define MARS_BUF_H
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#include <linux/list.h>
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#include <asm/atomic.h>
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//#define MARS_BUF_HASH_MAX 512
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#define MARS_BUF_HASH_MAX 2048
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#define LIST_FREE 0
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#define LIST_FORGET 1
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#define LIST_LRU 2
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#define LIST_MAX 3
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struct buf_mref_aspect {
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GENERIC_ASPECT(mref);
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struct buf_head *rfa_bf;
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//struct list_head rfa_bf_head;
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struct list_head rfa_pending_head;
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//struct list_head tmp_head;
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};
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struct cache_anchor {
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spinlock_t hash_lock;
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struct list_head hash_anchor;
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};
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struct buf_brick {
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MARS_BRICK(buf);
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/* brick parameters */
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int backing_order;
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int backing_size;
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int max_count;
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bool optimize_chains;
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/* internals */
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spinlock_t brick_lock;
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atomic_t alloc_count;
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atomic_t list_count[LIST_MAX];
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atomic_t hashed_count;
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atomic_t nr_io_pending;
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atomic_t nr_collisions;
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struct mars_info base_info;
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bool got_info;
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// lists for caching
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struct list_head list_anchor[LIST_MAX]; // members are hashed and not in use
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struct list_head forget_anchor; // like lru_anchor, but likely
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struct cache_anchor cache_anchors[MARS_BUF_HASH_MAX]; // hash table
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// statistics
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unsigned long last_jiffies;
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atomic_t hit_count;
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atomic_t miss_count;
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atomic_t opt_count;
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atomic_t chain_count;
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atomic_t post_count;
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atomic_t write_count;
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atomic_t io_count;
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};
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struct buf_input {
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MARS_INPUT(buf);
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};
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struct buf_output {
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MARS_OUTPUT(buf);
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};
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MARS_TYPES(buf);
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struct buf_head {
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void *bf_data; // this MUST come first
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spinlock_t bf_lock;
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struct buf_brick *bf_brick;
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loff_t bf_pos;
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loff_t bf_base_index;
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int bf_flags;
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int bf_error;
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atomic_t bf_hash_count; // # references pinning the hash
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atomic_t bf_mref_count; // # mrefs (only used for checking, no real semantics)
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atomic_t bf_io_count; // # IOs in flight
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// statistics / data for strategic decisions
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atomic_t bf_mfu_stat;
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atomic_t bf_chain_len;
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bool bf_chain_detected;
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// lists for caching
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//struct list_head bf_mref_anchor; // all current mref members
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struct list_head bf_list_head;
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struct list_head bf_hash_head;
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unsigned long bf_jiffies;
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int bf_member;
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// lists for IO
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struct list_head bf_io_pending_anchor;
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struct list_head bf_postpone_anchor;
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};
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#endif
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