1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
|
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2000 Silicon Graphics, Inc.
* All Rights Reserved.
*/
/*
* Define io syscalls supported by doio
*/
#define READ 1
#define WRITE 2
#define READA 3
#define WRITEA 4
#define SSREAD 5
#define SSWRITE 6
#define LISTIO 7
#define LREAD 10 /* listio - single stride, single entry */
#define LREADA 11
#define LWRITE 12
#define LWRITEA 13
#define LSREAD 14 /* listio - multi-stride, single entry */
#define LSREADA 15
#define LSWRITE 16
#define LSWRITEA 17
#define LEREAD 18 /* listio - single stride, multiple entry */
#define LEREADA 19
#define LEWRITE 20
#define LEWRITEA 21
/* System Calls */
#define PREAD 100
#define PWRITE 101
#define READV 102
#define WRITEV 103
#define AREAD 104
#define AWRITE 105
#define LLREAD 110
#define LLAREAD 111
#define LLWRITE 112
#define LLAWRITE 113
#define MMAPR 120
#define MMAPW 121
#define RESVSP 122 /* xfsctl(XFS_IOC_RESVSP) */
#define UNRESVSP 123 /* xfsctl(XFS_IOC_UNRESVSP) */
#define FSYNC2 125 /* fsync(2) */
#define FDATASYNC 126 /* fdatasync(2) */
#define DOIO_MAGIC 07116601
/*
* Define various user flags (r_uflag field) that io requests can have
* specified.
*/
#define F_WORD_ALIGNED 0001 /* force request to be word aligned */
/*
* define various doio exit status's
*/
#define E_NORMAL 000 /* normal completion */
#define E_USAGE 001 /* cmdline usage error */
#define E_SETUP 002 /* any of a million setup conditions */
#define E_COMPARE 004 /* data compare error from doio child */
#define E_INTERNAL 010 /* various internal errors */
#define E_LOCKD 020 /* lockd startup/timeout errors */
#define E_SIGNAL 040 /* killed by signal */
/*
* Define async io completion strategies supported by doio.
*/
#define A_POLL 1 /* poll iosw for completion */
#define A_SIGNAL 2 /* get signal for completion */
#define A_RECALL 3 /* use recall(2) to wait */
#define A_RECALLA 4 /* use recalla(2) to wait */
#define A_RECALLS 5 /* use recalls(2) to wait */
#define A_SUSPEND 6 /* use aio_suspend(2) to wait */
#define A_CALLBACK 7 /* use a callback signal op. */
/*
* Define individual structures for each syscall type. These will all be
* unionized into a single io_req structure which io generators fill in and
* pass to doio.
*
* Note: It is VERY important that the r_file, r_oflags, r_offset, and
* r_nbytes fields occupy the same record positions in the
* read_req, reada_req, write_req, and writea_req structures and
* that they have the same type. It is also that r_pattern
* has the same type/offset in the write_req and writea_req
* structures.
*
* Since doio.c accesses all information through the r_data
* union in io_req, if the above assumptions hold, the above
* fields can be accessed without regard to structure type.
* This is an allowed assumption in C.
*/
#define MAX_FNAME_LENGTH 128
struct read_req {
char r_file[MAX_FNAME_LENGTH];
int r_oflags; /* open flags */
int r_offset;
int r_nbytes;
int r_uflags; /* user flags: mem alignment */
int r_aio_strat; /* asynch read completion strategy */
int r_nstrides; /* listio: multiple strides */
int r_nent; /* listio: multiple list entries */
};
struct write_req {
char r_file[MAX_FNAME_LENGTH];
int r_oflags;
int r_offset;
int r_nbytes;
char r_pattern;
int r_uflags; /* user flags: mem alignment */
int r_aio_strat; /* asynch write completion strategy */
int r_nstrides; /* listio: multiple strides */
int r_nent; /* listio: multiple list entries */
};
struct ssread_req {
int r_nbytes;
};
struct sswrite_req {
int r_nbytes;
char r_pattern;
};
struct listio_req {
char r_file[MAX_FNAME_LENGTH];
int r_cmd; /* LC_START or LC_WAIT */
int r_offset; /* file offset */
int r_opcode; /* LO_READ, or LO_WRITE */
int r_nbytes; /* bytes per stride */
int r_nstrides; /* how many strides to make */
int r_nent; /* how many listreq entries to make */
int r_filestride; /* always 0 for now */
int r_memstride; /* always 0 for now */
char r_pattern; /* for LO_WRITE operations */
int r_oflags; /* open(2) flags */
int r_aio_strat; /* async I/O completion strategy */
int r_uflags; /* user flags: memory alignment */
};
#define rw_req listio_req /* listio is superset of everything */
/*
* Main structure for sending a request to doio. Any tools which form IO
* for doio must present it using one of these structures.
*/
struct io_req {
int r_type; /* must be one of the #defines above */
int r_magic; /* must be set to DOIO_MAGIC by requestor */
union {
struct read_req read;
struct write_req write;
struct ssread_req ssread;
struct sswrite_req sswrite;
struct listio_req listio;
struct rw_req io;
} r_data;
};
|
