2
* Copyright (c) 2006 Andrew Warfield and Julian Chesterfield
3
* Copyright (c) 2007 Red Hat, Inc.
5
* This program is free software; you can redistribute it and/or
6
* modify it under the terms of the GNU General Public License version 2
7
* as published by the Free Software Foundation; or, when distributed
8
* separately from the Linux kernel or incorporated into other
9
* software packages, subject to the following license:
11
* Permission is hereby granted, free of charge, to any person obtaining a copy
12
* of this source file (the "Software"), to deal in the Software without
13
* restriction, including without limitation the rights to use, copy, modify,
14
* merge, publish, distribute, sublicense, and/or sell copies of the Software,
15
* and to permit persons to whom the Software is furnished to do so, subject to
16
* the following conditions:
18
* The above copyright notice and this permission notice shall be included in
19
* all copies or substantial portions of the Software.
21
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
22
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
23
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
24
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
25
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
26
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
39
#define IOCB_IDX(_ctx, _io) ((_io) - (_ctx)->iocb_list)
41
struct tap_aio_internal_context {
44
struct io_event *aio_events;
51
unsigned int poll_in_thread : 1;
55
typedef struct tap_aio_internal_context tap_aio_internal_context_t;
68
struct tap_aio_context {
69
tap_aio_internal_context_t aio_ctx;
72
struct iocb *iocb_list;
73
struct iocb **iocb_free;
74
struct pending_aio *pending_aio;
76
struct iocb **iocb_queue;
78
struct io_event *aio_events;
80
/* Locking bitmap for AIO reads/writes */
84
typedef struct tap_aio_context tap_aio_context_t;
86
void tap_aio_continue (tap_aio_internal_context_t *ctx);
87
int tap_aio_get_events (tap_aio_internal_context_t *ctx);
88
int tap_aio_more_events(tap_aio_internal_context_t *ctx);
91
int tap_aio_init(tap_aio_context_t *ctx, uint64_t sectors,
93
void tap_aio_free(tap_aio_context_t *ctx);
95
int tap_aio_can_lock(tap_aio_context_t *ctx, uint64_t sector);
96
int tap_aio_lock(tap_aio_context_t *ctx, uint64_t sector);
97
void tap_aio_unlock(tap_aio_context_t *ctx, uint64_t sector);
100
int tap_aio_read(tap_aio_context_t *ctx, int fd, int size,
101
uint64_t offset, char *buf, td_callback_t cb,
102
int id, uint64_t sector, void *private);
103
int tap_aio_write(tap_aio_context_t *ctx, int fd, int size,
104
uint64_t offset, char *buf, td_callback_t cb,
105
int id, uint64_t sector, void *private);
106
int tap_aio_submit(tap_aio_context_t *ctx);
108
#endif /* __TAPAIO_H__ */