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
|
/*
* 9p
*
* Copyright IBM, Corp. 2010
*
* Authors:
* Gautham R Shenoy <ego@in.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qemu-fsdev.h"
#include "qemu/queue.h"
#include "qemu/config-file.h"
#include "qemu/error-report.h"
#include "qemu/option.h"
/*
* A table to store the various file systems and their callback operations.
* -----------------
* fstype | ops
* -----------------
* local | local_ops
* . |
* . |
* . |
* . |
* -----------------
* etc
*/
typedef struct FsDriverTable {
const char *name;
FileOperations *ops;
const char **opts;
} FsDriverTable;
typedef struct FsDriverListEntry {
FsDriverEntry fse;
QTAILQ_ENTRY(FsDriverListEntry) next;
} FsDriverListEntry;
static QTAILQ_HEAD(, FsDriverListEntry) fsdriver_entries =
QTAILQ_HEAD_INITIALIZER(fsdriver_entries);
#define COMMON_FS_DRIVER_OPTIONS "id", "fsdriver", "readonly"
static FsDriverTable FsDrivers[] = {
{
.name = "local",
.ops = &local_ops,
.opts = (const char * []) {
COMMON_FS_DRIVER_OPTIONS,
"security_model",
"path",
"writeout",
"fmode",
"dmode",
"multidevs",
"throttling.bps-total",
"throttling.bps-read",
"throttling.bps-write",
"throttling.iops-total",
"throttling.iops-read",
"throttling.iops-write",
"throttling.bps-total-max",
"throttling.bps-read-max",
"throttling.bps-write-max",
"throttling.iops-total-max",
"throttling.iops-read-max",
"throttling.iops-write-max",
"throttling.bps-total-max-length",
"throttling.bps-read-max-length",
"throttling.bps-write-max-length",
"throttling.iops-total-max-length",
"throttling.iops-read-max-length",
"throttling.iops-write-max-length",
"throttling.iops-size",
},
},
{
.name = "synth",
.ops = &synth_ops,
.opts = (const char * []) {
COMMON_FS_DRIVER_OPTIONS,
},
},
{
.name = "proxy",
.ops = &proxy_ops,
.opts = (const char * []) {
COMMON_FS_DRIVER_OPTIONS,
"socket",
"sock_fd",
"writeout",
},
},
};
static int validate_opt(void *opaque, const char *name, const char *value,
Error **errp)
{
FsDriverTable *drv = opaque;
const char **opt;
for (opt = drv->opts; *opt; opt++) {
if (!strcmp(*opt, name)) {
return 0;
}
}
error_setg(errp, "'%s' is invalid for fsdriver '%s'", name, drv->name);
return -1;
}
int qemu_fsdev_add(QemuOpts *opts, Error **errp)
{
int i;
struct FsDriverListEntry *fsle;
const char *fsdev_id = qemu_opts_id(opts);
const char *fsdriver = qemu_opt_get(opts, "fsdriver");
const char *writeout = qemu_opt_get(opts, "writeout");
bool ro = qemu_opt_get_bool(opts, "readonly", 0);
if (!fsdev_id) {
error_setg(errp, "fsdev: No id specified");
return -1;
}
if (fsdriver) {
for (i = 0; i < ARRAY_SIZE(FsDrivers); i++) {
if (strcmp(FsDrivers[i].name, fsdriver) == 0) {
break;
}
}
if (i == ARRAY_SIZE(FsDrivers)) {
error_setg(errp, "fsdev: fsdriver %s not found", fsdriver);
return -1;
}
} else {
error_setg(errp, "fsdev: No fsdriver specified");
return -1;
}
if (qemu_opt_foreach(opts, validate_opt, &FsDrivers[i], errp)) {
return -1;
}
fsle = g_malloc0(sizeof(*fsle));
fsle->fse.fsdev_id = g_strdup(fsdev_id);
fsle->fse.ops = FsDrivers[i].ops;
if (writeout) {
if (!strcmp(writeout, "immediate")) {
fsle->fse.export_flags |= V9FS_IMMEDIATE_WRITEOUT;
}
}
if (ro) {
fsle->fse.export_flags |= V9FS_RDONLY;
} else {
fsle->fse.export_flags &= ~V9FS_RDONLY;
}
if (fsle->fse.ops->parse_opts) {
if (fsle->fse.ops->parse_opts(opts, &fsle->fse, errp)) {
g_free(fsle->fse.fsdev_id);
g_free(fsle);
return -1;
}
}
QTAILQ_INSERT_TAIL(&fsdriver_entries, fsle, next);
return 0;
}
FsDriverEntry *get_fsdev_fsentry(char *id)
{
if (id) {
struct FsDriverListEntry *fsle;
QTAILQ_FOREACH(fsle, &fsdriver_entries, next) {
if (strcmp(fsle->fse.fsdev_id, id) == 0) {
return &fsle->fse;
}
}
}
return NULL;
}
|
