debuggers.hg

view tools/blktap/drivers/tapaio.h @ 0:7d21f7218375

Exact replica of unstable on 051908 + README-this
author Mukesh Rathor
date Mon May 19 15:34:57 2008 -0700 (2008-05-19)
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1 /*
2 * Copyright (c) 2006 Andrew Warfield and Julian Chesterfield
3 * Copyright (c) 2007 Red Hat, Inc.
4 *
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:
10 *
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:
17 *
18 * The above copyright notice and this permission notice shall be included in
19 * all copies or substantial portions of the Software.
20 *
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
27 * IN THE SOFTWARE.
28 */
30 #ifndef __TAPAIO_H__
31 #define __TAPAIO_H__
33 #include <pthread.h>
34 #include <libaio.h>
35 #include <stdint.h>
37 #include "tapdisk.h"
39 #define IOCB_IDX(_ctx, _io) ((_io) - (_ctx)->iocb_list)
41 struct tap_aio_internal_context {
42 io_context_t aio_ctx;
44 struct io_event *aio_events;
45 int max_aio_events;
47 pthread_t aio_thread;
48 int command_fd[2];
49 int completion_fd[2];
50 int pollfd;
51 unsigned int poll_in_thread : 1;
52 };
55 typedef struct tap_aio_internal_context tap_aio_internal_context_t;
58 struct pending_aio {
59 td_callback_t cb;
60 int id;
61 void *private;
62 int nb_sectors;
63 char *buf;
64 uint64_t sector;
65 };
68 struct tap_aio_context {
69 tap_aio_internal_context_t aio_ctx;
71 int max_aio_reqs;
72 struct iocb *iocb_list;
73 struct iocb **iocb_free;
74 struct pending_aio *pending_aio;
75 int iocb_free_count;
76 struct iocb **iocb_queue;
77 int iocb_queued;
78 struct io_event *aio_events;
80 /* Locking bitmap for AIO reads/writes */
81 uint8_t *sector_lock;
82 };
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,
92 int max_aio_reqs);
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__ */