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/*
* Copyright (c) 2006 Andrew Warfield and Julian Chesterfield
* Copyright (c) 2007 Red Hat, Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation; or, when distributed
* separately from the Linux kernel or incorporated into other
* software packages, subject to the following license:
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this source file (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy, modify,
* merge, publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#ifndef __TAPAIO_H__
#define __TAPAIO_H__
#include <pthread.h>
#include <libaio.h>
#include <stdint.h>
#include "tapdisk.h"
#define IOCB_IDX(_ctx, _io) ((_io) - (_ctx)->iocb_list)
struct tap_aio_internal_context {
io_context_t aio_ctx;
struct io_event *aio_events;
int max_aio_events;
pthread_t aio_thread;
int command_fd[2];
int completion_fd[2];
int pollfd;
unsigned int poll_in_thread : 1;
};
typedef struct tap_aio_internal_context tap_aio_internal_context_t;
struct pending_aio {
td_callback_t cb;
int id;
void *private;
int nb_sectors;
char *buf;
uint64_t sector;
};
struct tap_aio_context {
tap_aio_internal_context_t aio_ctx;
int max_aio_reqs;
struct iocb *iocb_list;
struct iocb **iocb_free;
struct pending_aio *pending_aio;
int iocb_free_count;
struct iocb **iocb_queue;
int iocb_queued;
struct io_event *aio_events;
/* Locking bitmap for AIO reads/writes */
uint8_t *sector_lock;
};
typedef struct tap_aio_context tap_aio_context_t;
void tap_aio_continue (tap_aio_internal_context_t *ctx);
int tap_aio_get_events (tap_aio_internal_context_t *ctx);
int tap_aio_more_events(tap_aio_internal_context_t *ctx);
int tap_aio_init(tap_aio_context_t *ctx, uint64_t sectors,
int max_aio_reqs);
void tap_aio_free(tap_aio_context_t *ctx);
int tap_aio_can_lock(tap_aio_context_t *ctx, uint64_t sector);
int tap_aio_lock(tap_aio_context_t *ctx, uint64_t sector);
void tap_aio_unlock(tap_aio_context_t *ctx, uint64_t sector);
int tap_aio_read(tap_aio_context_t *ctx, int fd, int size,
uint64_t offset, char *buf, td_callback_t cb,
int id, uint64_t sector, void *private);
int tap_aio_write(tap_aio_context_t *ctx, int fd, int size,
uint64_t offset, char *buf, td_callback_t cb,
int id, uint64_t sector, void *private);
int tap_aio_submit(tap_aio_context_t *ctx);
#endif /* __TAPAIO_H__ */
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