mars/kernel/mars_aio.h

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/*
* MARS Long Distance Replication Software
*
* This file is part of MARS project: http://schoebel.github.io/mars/
*
* Copyright (C) 2010-2014 Thomas Schoebel-Theuer
* Copyright (C) 2011-2014 1&1 Internet AG
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
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#ifndef MARS_AIO_H
#define MARS_AIO_H
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#include <linux/aio.h>
#include <linux/syscalls.h>
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#include "mars.h"
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#include "lib_mapfree.h"
#define AIO_SUBMIT_MAX_LATENCY 1000 // 1 ms
#define AIO_IO_R_MAX_LATENCY 50000 // 50 ms
#define AIO_IO_W_MAX_LATENCY 150000 // 150 ms
#define AIO_SYNC_MAX_LATENCY 150000 // 150 ms
#ifdef CONFIG_MARS_DEBUG
#define MARS_AIO_DEBUG
#endif
extern struct threshold aio_submit_threshold;
extern struct threshold aio_io_threshold[2];
extern struct threshold aio_sync_threshold;
/* aio_sync_mode:
* 0 = filemap_write_and_wait_range()
* 1 = fdatasync()
* 2 = fsync()
*/
extern int aio_sync_mode;
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struct aio_mref_aspect {
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GENERIC_ASPECT(mref);
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struct list_head io_head;
unsigned long long enqueue_stamp;
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long long start_jiffies;
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int resubmit;
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int alloc_len;
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bool do_dealloc;
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};
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struct aio_brick {
MARS_BRICK(aio);
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// parameters
bool o_creat;
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bool o_direct;
bool o_fdsync;
bool is_static_device;
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};
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struct aio_input {
MARS_INPUT(aio);
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};
struct aio_threadinfo {
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struct list_head mref_list[MARS_PRIO_NR];
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struct aio_output *output;
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struct task_struct *thread;
wait_queue_head_t event;
wait_queue_head_t terminate_event;
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struct mutex mutex;
int queued[MARS_PRIO_NR];
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atomic_t queued_sum;
#ifdef MARS_AIO_DEBUG
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atomic_t total_enqueue_count;
#endif
bool should_terminate;
bool terminated;
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};
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struct aio_output {
MARS_OUTPUT(aio);
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// private
struct mapfree_info *mf;
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int fd; // FIXME: remove this!
struct aio_threadinfo tinfo[3];
aio_context_t ctxp;
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wait_queue_head_t fdsync_event;
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bool fdsync_active;
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// statistics
int index;
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int error;
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atomic_t work_count;
atomic_t read_count;
atomic_t write_count;
atomic_t submit_count;
#ifdef MARS_AIO_DEBUG
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atomic_t total_read_count;
atomic_t total_write_count;
atomic_t total_alloc_count;
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atomic_t total_submit_count;
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atomic_t total_again_count;
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atomic_t total_delay_count;
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atomic_t total_msleep_count;
atomic_t total_fdsync_count;
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atomic_t total_fdsync_wait_count;
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atomic_t total_mapfree_count;
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atomic_t alloc_count;
#endif
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};
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MARS_TYPES(aio);
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#endif