root / hw / 9pfs / virtio-9p-device.c @ bc4caf49
History | View | Annotate | Download (5.6 kB)
1 |
/*
|
---|---|
2 |
* Virtio 9p backend
|
3 |
*
|
4 |
* Copyright IBM, Corp. 2010
|
5 |
*
|
6 |
* Authors:
|
7 |
* Anthony Liguori <aliguori@us.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 |
|
14 |
#include "hw/virtio.h" |
15 |
#include "hw/pc.h" |
16 |
#include "qemu_socket.h" |
17 |
#include "hw/virtio-pci.h" |
18 |
#include "virtio-9p.h" |
19 |
#include "fsdev/qemu-fsdev.h" |
20 |
#include "virtio-9p-xattr.h" |
21 |
#include "virtio-9p-coth.h" |
22 |
|
23 |
static uint32_t virtio_9p_get_features(VirtIODevice *vdev, uint32_t features)
|
24 |
{ |
25 |
features |= 1 << VIRTIO_9P_MOUNT_TAG;
|
26 |
return features;
|
27 |
} |
28 |
|
29 |
static V9fsState *to_virtio_9p(VirtIODevice *vdev)
|
30 |
{ |
31 |
return (V9fsState *)vdev;
|
32 |
} |
33 |
|
34 |
static void virtio_9p_get_config(VirtIODevice *vdev, uint8_t *config) |
35 |
{ |
36 |
int len;
|
37 |
struct virtio_9p_config *cfg;
|
38 |
V9fsState *s = to_virtio_9p(vdev); |
39 |
|
40 |
len = strlen(s->tag); |
41 |
cfg = g_malloc0(sizeof(struct virtio_9p_config) + len); |
42 |
stw_raw(&cfg->tag_len, len); |
43 |
/* We don't copy the terminating null to config space */
|
44 |
memcpy(cfg->tag, s->tag, len); |
45 |
memcpy(config, cfg, s->config_size); |
46 |
g_free(cfg); |
47 |
} |
48 |
|
49 |
VirtIODevice *virtio_9p_init(DeviceState *dev, V9fsConf *conf) |
50 |
{ |
51 |
V9fsState *s; |
52 |
int i, len;
|
53 |
struct stat stat;
|
54 |
FsDriverEntry *fse; |
55 |
V9fsPath path; |
56 |
|
57 |
s = (V9fsState *)virtio_common_init("virtio-9p",
|
58 |
VIRTIO_ID_9P, |
59 |
sizeof(struct virtio_9p_config)+ |
60 |
MAX_TAG_LEN, |
61 |
sizeof(V9fsState));
|
62 |
/* initialize pdu allocator */
|
63 |
QLIST_INIT(&s->free_list); |
64 |
QLIST_INIT(&s->active_list); |
65 |
for (i = 0; i < (MAX_REQ - 1); i++) { |
66 |
QLIST_INSERT_HEAD(&s->free_list, &s->pdus[i], next); |
67 |
} |
68 |
|
69 |
s->vq = virtio_add_queue(&s->vdev, MAX_REQ, handle_9p_output); |
70 |
|
71 |
fse = get_fsdev_fsentry(conf->fsdev_id); |
72 |
|
73 |
if (!fse) {
|
74 |
/* We don't have a fsdev identified by fsdev_id */
|
75 |
fprintf(stderr, "Virtio-9p device couldn't find fsdev with the "
|
76 |
"id = %s\n", conf->fsdev_id ? conf->fsdev_id : "NULL"); |
77 |
exit(1);
|
78 |
} |
79 |
|
80 |
if (!conf->tag) {
|
81 |
/* we haven't specified a mount_tag */
|
82 |
fprintf(stderr, "fsdev with id %s needs mount_tag arguments\n",
|
83 |
conf->fsdev_id); |
84 |
exit(1);
|
85 |
} |
86 |
|
87 |
s->ctx.export_flags = fse->export_flags; |
88 |
if (fse->path) {
|
89 |
s->ctx.fs_root = g_strdup(fse->path); |
90 |
} else {
|
91 |
s->ctx.fs_root = NULL;
|
92 |
} |
93 |
s->ctx.exops.get_st_gen = NULL;
|
94 |
len = strlen(conf->tag); |
95 |
if (len > MAX_TAG_LEN - 1) { |
96 |
fprintf(stderr, "mount tag '%s' (%d bytes) is longer than "
|
97 |
"maximum (%d bytes)", conf->tag, len, MAX_TAG_LEN - 1); |
98 |
exit(1);
|
99 |
} |
100 |
|
101 |
s->tag = strdup(conf->tag); |
102 |
s->ctx.uid = -1;
|
103 |
|
104 |
s->ops = fse->ops; |
105 |
s->vdev.get_features = virtio_9p_get_features; |
106 |
s->config_size = sizeof(struct virtio_9p_config) + len; |
107 |
s->vdev.get_config = virtio_9p_get_config; |
108 |
s->fid_list = NULL;
|
109 |
qemu_co_rwlock_init(&s->rename_lock); |
110 |
|
111 |
if (s->ops->init(&s->ctx) < 0) { |
112 |
fprintf(stderr, "Virtio-9p Failed to initialize fs-driver with id:%s"
|
113 |
" and export path:%s\n", conf->fsdev_id, s->ctx.fs_root);
|
114 |
exit(1);
|
115 |
} |
116 |
if (v9fs_init_worker_threads() < 0) { |
117 |
fprintf(stderr, "worker thread initialization failed\n");
|
118 |
exit(1);
|
119 |
} |
120 |
|
121 |
/*
|
122 |
* Check details of export path, We need to use fs driver
|
123 |
* call back to do that. Since we are in the init path, we don't
|
124 |
* use co-routines here.
|
125 |
*/
|
126 |
v9fs_path_init(&path); |
127 |
if (s->ops->name_to_path(&s->ctx, NULL, "/", &path) < 0) { |
128 |
fprintf(stderr, |
129 |
"error in converting name to path %s", strerror(errno));
|
130 |
exit(1);
|
131 |
} |
132 |
if (s->ops->lstat(&s->ctx, &path, &stat)) {
|
133 |
fprintf(stderr, "share path %s does not exist\n", fse->path);
|
134 |
exit(1);
|
135 |
} else if (!S_ISDIR(stat.st_mode)) { |
136 |
fprintf(stderr, "share path %s is not a directory\n", fse->path);
|
137 |
exit(1);
|
138 |
} |
139 |
v9fs_path_free(&path); |
140 |
|
141 |
return &s->vdev;
|
142 |
} |
143 |
|
144 |
static int virtio_9p_init_pci(PCIDevice *pci_dev) |
145 |
{ |
146 |
VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev); |
147 |
VirtIODevice *vdev; |
148 |
|
149 |
vdev = virtio_9p_init(&pci_dev->qdev, &proxy->fsconf); |
150 |
vdev->nvectors = proxy->nvectors; |
151 |
virtio_init_pci(proxy, vdev); |
152 |
/* make the actual value visible */
|
153 |
proxy->nvectors = vdev->nvectors; |
154 |
return 0; |
155 |
} |
156 |
|
157 |
static Property virtio_9p_properties[] = {
|
158 |
DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags, VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true), |
159 |
DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 2), |
160 |
DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features), |
161 |
DEFINE_PROP_STRING("mount_tag", VirtIOPCIProxy, fsconf.tag),
|
162 |
DEFINE_PROP_STRING("fsdev", VirtIOPCIProxy, fsconf.fsdev_id),
|
163 |
DEFINE_PROP_END_OF_LIST(), |
164 |
}; |
165 |
|
166 |
static void virtio_9p_class_init(ObjectClass *klass, void *data) |
167 |
{ |
168 |
DeviceClass *dc = DEVICE_CLASS(klass); |
169 |
PCIDeviceClass *k = PCI_DEVICE_CLASS(klass); |
170 |
|
171 |
k->init = virtio_9p_init_pci; |
172 |
k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET; |
173 |
k->device_id = 0x1009;
|
174 |
k->revision = VIRTIO_PCI_ABI_VERSION; |
175 |
k->class_id = 0x2;
|
176 |
dc->props = virtio_9p_properties; |
177 |
dc->reset = virtio_pci_reset; |
178 |
} |
179 |
|
180 |
static TypeInfo virtio_9p_info = {
|
181 |
.name = "virtio-9p-pci",
|
182 |
.parent = TYPE_PCI_DEVICE, |
183 |
.instance_size = sizeof(VirtIOPCIProxy),
|
184 |
.class_init = virtio_9p_class_init, |
185 |
}; |
186 |
|
187 |
static void virtio_9p_register_types(void) |
188 |
{ |
189 |
type_register_static(&virtio_9p_info); |
190 |
virtio_9p_set_fd_limit(); |
191 |
} |
192 |
|
193 |
type_init(virtio_9p_register_types) |