mars/kernel/mars_if.h

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// (c) 2010 Thomas Schoebel-Theuer / 1&1 Internet AG
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#ifndef MARS_IF_H
#define MARS_IF_H
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#include <linux/semaphore.h>
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#define HT_SHIFT 6 //????
#define MARS_MAX_SEGMENT_SIZE (1U << (9+HT_SHIFT))
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#define MAX_BIO 32
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//#define USE_TIMER (HZ/10) // use this ONLY for debugging
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///////////////////////// 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;
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unsigned long start_time;
};
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struct if_mref_aspect {
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GENERIC_ASPECT(mref);
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struct list_head plug_head;
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struct list_head hash_head;
int hash_index;
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int bio_count;
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int current_len;
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int max_len;
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struct page *orig_page;
struct bio_wrapper *orig_biow[MAX_BIO];
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struct if_input *input;
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};
struct if_hash_anchor;
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struct if_input {
MARS_INPUT(if);
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// TODO: move this to if_brick (better systematics)
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struct list_head plug_anchor;
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struct request_queue *q;
struct gendisk *disk;
struct block_device *bdev;
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#ifdef USE_TIMER
struct timer_list timer;
#endif
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loff_t capacity;
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atomic_t plugged_count;
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atomic_t flying_count;
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// only for statistics
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atomic_t read_flying_count;
atomic_t write_flying_count;
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atomic_t total_reada_count;
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atomic_t total_read_count;
atomic_t total_write_count;
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atomic_t total_empty_count;
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atomic_t total_fire_count;
atomic_t total_skip_sync_count;
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atomic_t total_mref_read_count;
atomic_t total_mref_write_count;
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spinlock_t req_lock;
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struct semaphore kick_sem;
struct if_hash_anchor *hash_table;
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};
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struct if_output {
MARS_OUTPUT(if);
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};
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struct if_brick {
MARS_BRICK(if);
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// parameters
loff_t dev_size;
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int max_plugged;
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int readahead;
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bool skip_sync;
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// inspectable
atomic_t open_count;
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// private
struct semaphore switch_sem;
struct say_channel *say_channel;
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};
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MARS_TYPES(if);
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#endif