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
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
/* Store argument parsing
Copyright (C) 1996 Free Software Foundation, Inc.
Written by Miles Bader <miles@gnu.ai.mit.edu>
This file is part of the GNU Hurd.
The GNU Hurd is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, or (at
your option) any later version.
The GNU Hurd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
675 Mass Ave, Cambridge, MA 02139, USA. */
#include <string.h>
#include <assert.h>
#include <hurd.h>
#include <argp.h>
#include <argz.h>
#include "store.h"
static const struct argp_option options[] = {
{"device", 'd', 0, 0, "DEVICE is a mach device, not a file"},
{"interleave",'I', "BLOCKS", 0, "Interleave in runs of length BLOCKS"},
{"layer", 'L', 0, 0, "Layer multiple devices for redundancy"},
{0}
};
static const char args_doc[] = "DEVICE...";
static const char doc[] = "\vIf multiple DEVICEs are specified, they are"
" concatenated unless either --interleave or --layer is specified (mutually"
" exlusive).";
struct store_parsed
{
char *names;
size_t names_len;
off_t interleave; /* --interleave value */
int machdev : 1; /* --machdev specified */
int layer : 1; /* --layer specified */
};
void
store_parsed_free (struct store_parsed *parsed)
{
free (parsed->names);
free (parsed);
}
/* Add the arguments PARSED, and return the corresponding store in STORE. */
error_t
store_parsed_append_args (const struct store_parsed *parsed,
char **args, size_t *args_len)
{
error_t err = 0;
size_t num_names = argz_count (parsed->names, parsed->names_len);
if (parsed->machdev)
err = argz_add (args, args_len, "--machdev");
if (!err && num_names > 1 && (parsed->interleave || parsed->layer))
{
char buf[40];
if (parsed->interleave)
snprintf (buf, sizeof buf, "--interleave=%ld", parsed->interleave);
else
snprintf (buf, sizeof buf, "--layer=%ld", parsed->layer);
err = argz_add (args, args_len, buf);
}
if (! err)
err = argz_append (args, args_len, parsed->names, parsed->names_len);
return err;
}
/* Open PARSED, and return the corresponding store in STORE. */
error_t
store_parsed_open (const struct store_parsed *parsed, int flags,
struct store_class *classes,
struct store **store)
{
size_t num = argz_count (parsed->names, parsed->names_len);
error_t open (char *name, struct store **store)
{
if (parsed->machdev)
return store_device_open (name, flags, store);
else
return store_open (name, flags, classes, store);
}
if (num == 1)
return open (parsed->names, store);
else
{
int i;
char *name;
error_t err = 0;
struct store **stores = malloc (sizeof (struct store *) * num);
if (! stores)
return ENOMEM;
for (i = 0, name = parsed->names;
!err && i < num;
i++, name = argz_next (parsed->names, parsed->names_len, name))
err = open (name, &stores[i]);
if (! err)
if (parsed->interleave)
err =
store_ileave_create (stores, num, parsed->interleave,
flags, store);
else if (parsed->layer)
assert (! parsed->layer);
else
err = store_concat_create (stores, num, flags, store);
if (err)
{
while (i > 0)
store_free (stores[i--]);
free (stores);
}
return err;
}
}
static error_t
parse_opt (int opt, char *arg, struct argp_state *state)
{
error_t err;
struct store_parsed *parsed = state->hook;
/* Print a parsing error message and (if exiting is turned off) return the
error code ERR. */
#define PERR(err, fmt, args...) \
do { argp_error (state, fmt , ##args); return err; } while (0)
switch (opt)
{
case 'd':
parsed->machdev = 1; break;
case 'I':
if (parsed->layer)
PERR (EINVAL, "--layer and --interleave are exclusive");
if (parsed->interleave)
/* Actually no reason why we couldn't support this.... */
PERR (EINVAL, "--interleave specified multiple times");
parsed->interleave = atoi (arg);
if (! parsed->interleave)
PERR (EINVAL, "%s: Bad value for --interleave", arg);
break;
case 'L':
#if 1
argp_failure (state, 5, 0, "--layer not implemented");
return EINVAL;
#else
if (parsed->interleave)
PERR (EINVAL, "--layer and --interleave are exclusive");
parsed->layer = 1;
#endif
break;
case ARGP_KEY_ARG:
/* A store device to use! */
err = argz_add (&parsed->names, &parsed->names_len, arg);
if (err)
argp_failure (state, 1, err, "%s", arg);
return err;
break;
case ARGP_KEY_INIT:
/* Initialize our parsing state. */
if (! state->input)
return EINVAL; /* Need at least a way to return a result. */
state->hook = malloc (sizeof (struct store_parsed));
if (! state->hook)
return ENOMEM;
bzero (state->hook, sizeof (struct store_parsed));
break;
case ARGP_KEY_ERROR:
/* Parsing error occured, free everything. */
store_parsed_free (parsed); break;
case ARGP_KEY_SUCCESS:
/* Successfully finished parsing, return a result. */
if (parsed->names == 0)
{
store_parsed_free (parsed);
PERR (EINVAL, "No store specified");
}
else
*(struct store_parsed **)state->input = parsed;
break;
default:
return ARGP_ERR_UNKNOWN;
}
return 0;
}
struct argp
store_argp = { options, parse_opt, args_doc, doc };
|
