1 /*
2 * 9p
3 *
4 * Copyright IBM, Corp. 2010
5 *
6 * Authors:
7 * Gautham R Shenoy <ego@in.ibm.com>
8 *
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
11 */
12
13 #include "qemu/osdep.h"
14 #include "qapi/error.h"
15 #include "qemu-fsdev.h"
16 #include "qemu/queue.h"
17 #include "qemu/config-file.h"
18 #include "qemu/error-report.h"
19 #include "qemu/option.h"
20
21 /*
22 * A table to store the various file systems and their callback operations.
23 * -----------------
24 * fstype | ops
25 * -----------------
26 * local | local_ops
27 * . |
28 * . |
29 * . |
30 * . |
31 * -----------------
32 * etc
33 */
34 typedef struct FsDriverTable {
35 const char *name;
36 FileOperations *ops;
37 const char **opts;
38 } FsDriverTable;
39
40 typedef struct FsDriverListEntry {
41 FsDriverEntry fse;
42 QTAILQ_ENTRY(FsDriverListEntry) next;
43 } FsDriverListEntry;
44
45 static QTAILQ_HEAD(, FsDriverListEntry) fsdriver_entries =
46 QTAILQ_HEAD_INITIALIZER(fsdriver_entries);
47
48 #define COMMON_FS_DRIVER_OPTIONS "id", "fsdriver", "readonly"
49
50 static FsDriverTable FsDrivers[] = {
51 {
52 .name = "local",
53 .ops = &local_ops,
54 .opts = (const char * []) {
55 COMMON_FS_DRIVER_OPTIONS,
56 "security_model",
57 "path",
58 "writeout",
59 "fmode",
60 "dmode",
61 "multidevs",
62 "throttling.bps-total",
63 "throttling.bps-read",
64 "throttling.bps-write",
65 "throttling.iops-total",
66 "throttling.iops-read",
67 "throttling.iops-write",
68 "throttling.bps-total-max",
69 "throttling.bps-read-max",
70 "throttling.bps-write-max",
71 "throttling.iops-total-max",
72 "throttling.iops-read-max",
73 "throttling.iops-write-max",
74 "throttling.bps-total-max-length",
75 "throttling.bps-read-max-length",
76 "throttling.bps-write-max-length",
77 "throttling.iops-total-max-length",
78 "throttling.iops-read-max-length",
79 "throttling.iops-write-max-length",
80 "throttling.iops-size",
81 NULL
82 },
83 },
84 {
85 .name = "synth",
86 .ops = &synth_ops,
87 .opts = (const char * []) {
88 COMMON_FS_DRIVER_OPTIONS,
89 NULL
90 },
91 },
92 {
93 .name = "proxy",
94 .ops = &proxy_ops,
95 .opts = (const char * []) {
96 COMMON_FS_DRIVER_OPTIONS,
97 "socket",
98 "sock_fd",
99 "writeout",
100 NULL
101 },
102 },
103 };
104
validate_opt(void * opaque,const char * name,const char * value,Error ** errp)105 static int validate_opt(void *opaque, const char *name, const char *value,
106 Error **errp)
107 {
108 FsDriverTable *drv = opaque;
109 const char **opt;
110
111 for (opt = drv->opts; *opt; opt++) {
112 if (!strcmp(*opt, name)) {
113 return 0;
114 }
115 }
116
117 error_setg(errp, "'%s' is invalid for fsdriver '%s'", name, drv->name);
118 return -1;
119 }
120
qemu_fsdev_add(QemuOpts * opts,Error ** errp)121 int qemu_fsdev_add(QemuOpts *opts, Error **errp)
122 {
123 int i;
124 struct FsDriverListEntry *fsle;
125 const char *fsdev_id = qemu_opts_id(opts);
126 const char *fsdriver = qemu_opt_get(opts, "fsdriver");
127 const char *writeout = qemu_opt_get(opts, "writeout");
128 bool ro = qemu_opt_get_bool(opts, "readonly", 0);
129
130 if (!fsdev_id) {
131 error_setg(errp, "fsdev: No id specified");
132 return -1;
133 }
134
135 if (fsdriver) {
136 for (i = 0; i < ARRAY_SIZE(FsDrivers); i++) {
137 if (strcmp(FsDrivers[i].name, fsdriver) == 0) {
138 break;
139 }
140 }
141
142 if (i == ARRAY_SIZE(FsDrivers)) {
143 error_setg(errp, "fsdev: fsdriver %s not found", fsdriver);
144 return -1;
145 }
146 } else {
147 error_setg(errp, "fsdev: No fsdriver specified");
148 return -1;
149 }
150
151 if (qemu_opt_foreach(opts, validate_opt, &FsDrivers[i], errp)) {
152 return -1;
153 }
154
155 fsle = g_malloc0(sizeof(*fsle));
156 fsle->fse.fsdev_id = g_strdup(fsdev_id);
157 fsle->fse.ops = FsDrivers[i].ops;
158 if (writeout) {
159 if (!strcmp(writeout, "immediate")) {
160 fsle->fse.export_flags |= V9FS_IMMEDIATE_WRITEOUT;
161 }
162 }
163 if (ro) {
164 fsle->fse.export_flags |= V9FS_RDONLY;
165 } else {
166 fsle->fse.export_flags &= ~V9FS_RDONLY;
167 }
168
169 if (fsle->fse.ops->parse_opts) {
170 if (fsle->fse.ops->parse_opts(opts, &fsle->fse, errp)) {
171 g_free(fsle->fse.fsdev_id);
172 g_free(fsle);
173 return -1;
174 }
175 }
176
177 QTAILQ_INSERT_TAIL(&fsdriver_entries, fsle, next);
178 return 0;
179 }
180
get_fsdev_fsentry(char * id)181 FsDriverEntry *get_fsdev_fsentry(char *id)
182 {
183 if (id) {
184 struct FsDriverListEntry *fsle;
185
186 QTAILQ_FOREACH(fsle, &fsdriver_entries, next) {
187 if (strcmp(fsle->fse.fsdev_id, id) == 0) {
188 return &fsle->fse;
189 }
190 }
191 }
192 return NULL;
193 }
194