mirror of
https://github.com/schoebel/mars
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106 lines
2.6 KiB
C
106 lines
2.6 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_BIO_H
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#define MARS_BIO_H
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#define BIO_RESPONSE_THREADS 4
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#define BIO_SUBMIT_MAX_LATENCY 250 // 250 us
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#define BIO_IO_R_MAX_LATENCY 40000 // 40 ms
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#define BIO_IO_W_MAX_LATENCY 100000 // 100 ms
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#ifdef CONFIG_MARS_DEBUG
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#define MARS_BIO_DEBUG
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extern struct mars_limiter bio_throttle_read;
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extern struct mars_limiter bio_throttle_write;
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#endif
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extern int bio_nr_requests;
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extern struct threshold bio_submit_threshold;
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extern struct threshold bio_io_threshold[2];
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#include <linux/blkdev.h>
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struct bio_mref_aspect {
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GENERIC_ASPECT(mref);
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struct list_head io_head;
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struct bio *bio;
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struct bio_output *output;
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unsigned long long start_stamp;
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int status_code;
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int hash_pos;
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int alloc_len;
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bool do_dealloc;
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};
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struct bio_response {
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struct list_head completed_list;
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wait_queue_head_t response_event;
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brick_thread_t *response_thread;
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struct bio_brick *brick;
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};
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struct bio_brick {
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MARS_BRICK(bio);
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// tunables
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int ra_pages;
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int bg_threshold;
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int bg_maxfly;
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bool do_sync;
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bool do_unplug;
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// readonly
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loff_t total_size;
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atomic_t fly_count[MARS_PRIO_NR];
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atomic_t queue_count[MARS_PRIO_NR];
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atomic_t completed_count;
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int error;
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#ifdef MARS_BIO_DEBUG
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atomic_t total_completed_count[MARS_PRIO_NR];
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#endif
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// private
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spinlock_t lock;
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struct list_head queue_list[MARS_PRIO_NR];
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struct list_head submitted_list[2];
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wait_queue_head_t submit_event;
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struct mapfree_info *mf;
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struct block_device *bdev;
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brick_thread_t *submit_thread;
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struct bio_response rsp[BIO_RESPONSE_THREADS];
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unsigned int rsp_nr;
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int bvec_max;
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bool submitted;
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};
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struct bio_input {
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MARS_INPUT(bio);
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};
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struct bio_output {
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MARS_OUTPUT(bio);
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};
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MARS_TYPES(bio);
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#endif
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