1 | /* $NetBSD: aio.h,v 1.13 2016/04/09 19:55:33 riastradh 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 | #include <sys/types.h> |
33 | #include <sys/signal.h> |
34 | |
35 | /* Returned by aio_cancel() */ |
36 | #define AIO_CANCELED 0x1 |
37 | #define AIO_NOTCANCELED 0x2 |
38 | #define AIO_ALLDONE 0x3 |
39 | |
40 | /* LIO opcodes */ |
41 | #define LIO_NOP 0x0 |
42 | #define LIO_WRITE 0x1 |
43 | #define LIO_READ 0x2 |
44 | |
45 | /* LIO modes */ |
46 | #define LIO_NOWAIT 0x0 |
47 | #define LIO_WAIT 0x1 |
48 | |
49 | /* |
50 | * Asynchronous I/O structure. |
51 | * Defined in the Base Definitions volume of IEEE Std 1003.1-2001 . |
52 | */ |
53 | struct aiocb { |
54 | off_t aio_offset; /* File offset */ |
55 | volatile void *aio_buf; /* I/O buffer in process space */ |
56 | size_t aio_nbytes; /* Length of transfer */ |
57 | int aio_fildes; /* File descriptor */ |
58 | int aio_lio_opcode; /* LIO opcode */ |
59 | int aio_reqprio; /* Request priority offset */ |
60 | struct sigevent aio_sigevent; /* Signal to deliver */ |
61 | |
62 | /* Internal kernel variables */ |
63 | int _state; /* State of the job */ |
64 | int _errno; /* Error value */ |
65 | ssize_t _retval; /* Return value */ |
66 | }; |
67 | |
68 | /* Internal kernel data */ |
69 | #ifdef _KERNEL |
70 | |
71 | /* Default limits of allowed AIO operations */ |
72 | #define AIO_LISTIO_MAX 512 |
73 | #define AIO_MAX (AIO_LISTIO_MAX * 16) |
74 | |
75 | #include <sys/condvar.h> |
76 | #include <sys/lwp.h> |
77 | #include <sys/mutex.h> |
78 | #include <sys/pool.h> |
79 | #include <sys/queue.h> |
80 | |
81 | /* Operations (as flags) */ |
82 | #define AIO_LIO 0x00 |
83 | #define AIO_READ 0x01 |
84 | #define AIO_WRITE 0x02 |
85 | #define AIO_SYNC 0x04 |
86 | #define AIO_DSYNC 0x08 |
87 | |
88 | /* Job states */ |
89 | #define JOB_NONE 0x0 |
90 | #define JOB_WIP 0x1 |
91 | #define JOB_DONE 0x2 |
92 | |
93 | /* Structure of AIO job */ |
94 | struct aio_job { |
95 | int aio_op; /* Operation code */ |
96 | struct aiocb aiocbp; /* AIO data structure */ |
97 | void *aiocb_uptr; /* User-space pointer for identification of job */ |
98 | TAILQ_ENTRY(aio_job) list; |
99 | struct lio_req *lio; |
100 | }; |
101 | |
102 | /* LIO structure */ |
103 | struct lio_req { |
104 | u_int refcnt; /* Reference counter */ |
105 | struct sigevent sig; /* Signal of lio_listio() calls */ |
106 | }; |
107 | |
108 | /* Structure of AIO data for process */ |
109 | struct aioproc { |
110 | kmutex_t aio_mtx; /* Protects the entire structure */ |
111 | kcondvar_t aio_worker_cv; /* Signals on a new job */ |
112 | kcondvar_t done_cv; /* Signals when the job is done */ |
113 | struct aio_job *curjob; /* Currently processing AIO job */ |
114 | unsigned int jobs_count; /* Count of the jobs */ |
115 | TAILQ_HEAD(, aio_job) jobs_queue;/* Queue of the AIO jobs */ |
116 | struct lwp *aio_worker; /* AIO worker thread */ |
117 | }; |
118 | |
119 | extern u_int aio_listio_max; |
120 | /* Prototypes */ |
121 | void aio_print_jobs(void (*)(const char *, ...) __printflike(1, 2)); |
122 | int aio_suspend1(struct lwp *, struct aiocb **, int, struct timespec *); |
123 | |
124 | #endif /* _KERNEL */ |
125 | |
126 | #endif /* _SYS_AIO_H_ */ |
127 | |