mirror of
https://github.com/schoebel/mars
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124 lines
3.0 KiB
C
124 lines
3.0 KiB
C
/*
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* MARS Long Distance Replication Software
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*
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* This file is part of MARS project: http://schoebel.github.io/mars/
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*
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* Copyright (C) 2010-2014 Thomas Schoebel-Theuer
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* Copyright (C) 2011-2014 1&1 Internet AG
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef MARS_IF_H
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#define MARS_IF_H
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#include "lib_limiter.h"
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#include <linux/semaphore.h>
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#define MARS_MAX_SEGMENT_SIZE (PAGE_SIZE)
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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 ////////////////////////
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extern int if_nr_requests;
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extern int if_throttle_start_size; // in kb
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extern struct mars_limiter if_throttle;
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/////////////////////////////////////////////////
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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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unsigned long start_time;
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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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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_hash_anchor;
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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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loff_t capacity;
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atomic_t plugged_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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struct if_hash_anchor *hash_table;
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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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atomic_t open_count;
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atomic_t flying_count;
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struct lamport_time completion_stamp;
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struct mars_limiter io_limiter;
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int error_code;
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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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struct mars_info info;
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};
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MARS_TYPES(if);
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#endif
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