FreeBSD/Linux Kernel Cross Reference
sys/sys/aio.h
1 /* $NetBSD: aio.h,v 1.7 2008/05/26 17:45:51 rmind Exp $ */
2
3 /*
4 * Copyright (c) 2007, Mindaugas Rasiukevicius <rmind at NetBSD org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #ifndef _SYS_AIO_H_
30 #define _SYS_AIO_H_
31
32 /* Returned by aio_cancel() */
33 #define AIO_CANCELED 0x1
34 #define AIO_NOTCANCELED 0x2
35 #define AIO_ALLDONE 0x3
36
37 /* LIO opcodes */
38 #define LIO_NOP 0x0
39 #define LIO_WRITE 0x1
40 #define LIO_READ 0x2
41
42 /* LIO modes */
43 #define LIO_NOWAIT 0x0
44 #define LIO_WAIT 0x1
45
46 /*
47 * Asynchronous I/O structure.
48 * Defined in the Base Definitions volume of IEEE Std 1003.1-2001 .
49 */
50 struct aiocb {
51 off_t aio_offset; /* File offset */
52 volatile void *aio_buf; /* I/O buffer in process space */
53 size_t aio_nbytes; /* Length of transfer */
54 int aio_fildes; /* File descriptor */
55 int aio_lio_opcode; /* LIO opcode */
56 int aio_reqprio; /* Request priority offset */
57 struct sigevent aio_sigevent; /* Signal to deliver */
58
59 /* Internal kernel variables */
60 int _state; /* State of the job */
61 int _errno; /* Error value */
62 ssize_t _retval; /* Return value */
63 };
64
65 /* Internal kernel data */
66 #ifdef _KERNEL
67
68 /* Default limits of allowed AIO operations */
69 #define AIO_LISTIO_MAX 512
70 #define AIO_MAX AIO_LISTIO_MAX * 16
71
72 #include <sys/condvar.h>
73 #include <sys/lwp.h>
74 #include <sys/mutex.h>
75 #include <sys/pool.h>
76 #include <sys/queue.h>
77
78 /* Operations (as flags) */
79 #define AIO_LIO 0x00
80 #define AIO_READ 0x01
81 #define AIO_WRITE 0x02
82 #define AIO_SYNC 0x04
83 #define AIO_DSYNC 0x08
84
85 /* Job states */
86 #define JOB_NONE 0x0
87 #define JOB_WIP 0x1
88 #define JOB_DONE 0x2
89
90 /* Structure of AIO job */
91 struct aio_job {
92 int aio_op; /* Operation code */
93 struct aiocb aiocbp; /* AIO data structure */
94 void *aiocb_uptr; /* User-space pointer for identification of job */
95 TAILQ_ENTRY(aio_job) list;
96 struct lio_req *lio;
97 };
98
99 /* LIO structure */
100 struct lio_req {
101 u_int refcnt; /* Reference counter */
102 struct sigevent sig; /* Signal of lio_listio() calls */
103 };
104
105 /* Structure of AIO data for process */
106 struct aioproc {
107 kmutex_t aio_mtx; /* Protects the entire structure */
108 kcondvar_t aio_worker_cv; /* Signals on a new job */
109 kcondvar_t done_cv; /* Signals when the job is done */
110 struct aio_job *curjob; /* Currently processing AIO job */
111 unsigned int jobs_count; /* Count of the jobs */
112 TAILQ_HEAD(, aio_job) jobs_queue;/* Queue of the AIO jobs */
113 struct lwp *aio_worker; /* AIO worker thread */
114 };
115
116 /* Prototypes */
117 void aio_sysinit(void);
118 int aio_init(struct proc *);
119 void aio_exit(struct proc *, struct aioproc *);
120 void aio_print_jobs(void (*pr)(const char *, ...));
121
122 #endif /* _KERNEL */
123
124 #endif /* _SYS_AIO_H_ */
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