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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 | ||
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 | ||
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 | ||
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 | } |