mirror of https://github.com/schoebel/mars
91 lines
1.9 KiB
C
91 lines
1.9 KiB
C
// (c) 2010 Thomas Schoebel-Theuer / 1&1 Internet AG
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#ifndef MARS_IF_H
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#define MARS_IF_H
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#include <linux/semaphore.h>
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#define HT_SHIFT 6 //????
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#define MARS_MAX_SEGMENT_SIZE (1U << (9+HT_SHIFT))
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#define MAX_BIO 32
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#define IF_HASH_MAX 2048
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#define IF_HASH_CHUNK (PAGE_SIZE * 32)
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//#define USE_TIMER (HZ/10) // use this ONLY for debugging
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/* I don't want to enhance / intrude into struct bio for compatibility reasons
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* (support for a variety of kernel versions).
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* The following is just a silly workaround which could be removed again.
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*/
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struct bio_wrapper {
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struct bio *bio;
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atomic_t bi_comp_cnt;
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};
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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;
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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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bool is_kmapped;
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struct page *orig_page;
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struct bio_wrapper *orig_biow[MAX_BIO];
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struct if_input *input;
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};
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struct if_input {
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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;
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struct gendisk *disk;
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struct block_device *bdev;
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#ifdef USE_TIMER
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struct timer_list timer;
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#endif
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unsigned long capacity;
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atomic_t open_count;
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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;
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atomic_t write_flying_count;
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atomic_t total_reada_count;
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atomic_t total_read_count;
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atomic_t total_write_count;
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atomic_t total_empty_count;
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atomic_t total_fire_count;
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atomic_t total_skip_sync_count;
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atomic_t total_mref_read_count;
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atomic_t total_mref_write_count;
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spinlock_t req_lock;
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struct semaphore kick_sem;
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spinlock_t hash_lock[IF_HASH_MAX];
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struct list_head hash_table[IF_HASH_MAX];
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};
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struct if_output {
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MARS_OUTPUT(if);
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};
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struct if_brick {
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MARS_BRICK(if);
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// parameters
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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
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// private
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struct semaphore switch_sem;
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struct say_channel *say_channel;
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};
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MARS_TYPES(if);
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#endif
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