mirror of https://github.com/schoebel/mars
83 lines
1.8 KiB
C
83 lines
1.8 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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struct buf_mars_ref_aspect {
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GENERIC_ASPECT(mars_ref);
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struct buf_head *rfa_bf;
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struct list_head rfa_pending_head;
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struct list_head tmp_head;
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struct generic_callback cb;
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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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/* internals */
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spinlock_t brick_lock;
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atomic_t alloc_count;
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atomic_t hashed_count;
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atomic_t lru_count;
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atomic_t nr_io_pending;
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atomic_t nr_collisions;
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struct generic_object_layout mref_object_layout;
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struct mars_info base_info;
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// lists for caching
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struct list_head free_anchor; // members are not hashed
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struct list_head lru_anchor; // members are hashed and not in use
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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 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;
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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_count;
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atomic_t bf_io_count;
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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_lru_head;
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struct list_head bf_hash_head;
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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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