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/*
* Virtio 9p backend
*
* Copyright IBM, Corp. 2010
*
* Authors:
* Anthony Liguori <aliguori@us.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 "hw/virtio/virtio.h"
#include "hw/i386/pc.h"
#include "qemu/sockets.h"
#include "virtio-9p.h"
#include "fsdev/qemu-fsdev.h"
#include "9p-xattr.h"
#include "coth.h"
#include "hw/virtio/virtio-access.h"
void virtio_9p_push_and_notify(V9fsPDU *pdu)
{
V9fsState *s = pdu->s;
/* push onto queue and notify */
virtqueue_push(s->vq, &pdu->elem, pdu->size);
/* FIXME: we should batch these completions */
virtio_notify(VIRTIO_DEVICE(s), s->vq);
}
static uint64_t virtio_9p_get_features(VirtIODevice *vdev, uint64_t features,
Error **errp)
{
virtio_add_feature(&features, VIRTIO_9P_MOUNT_TAG);
return features;
}
static void virtio_9p_get_config(VirtIODevice *vdev, uint8_t *config)
{
int len;
struct virtio_9p_config *cfg;
V9fsState *s = VIRTIO_9P(vdev);
len = strlen(s->tag);
cfg = g_malloc0(sizeof(struct virtio_9p_config) + len);
virtio_stw_p(vdev, &cfg->tag_len, len);
/* We don't copy the terminating null to config space */
memcpy(cfg->tag, s->tag, len);
memcpy(config, cfg, s->config_size);
g_free(cfg);
}
static void virtio_9p_save(QEMUFile *f, void *opaque)
{
virtio_save(VIRTIO_DEVICE(opaque), f);
}
static int virtio_9p_load(QEMUFile *f, void *opaque, int version_id)
{
return virtio_load(VIRTIO_DEVICE(opaque), f, version_id);
}
static void virtio_9p_device_realize(DeviceState *dev, Error **errp)
{
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
V9fsState *s = VIRTIO_9P(dev);
int i, len;
struct stat stat;
FsDriverEntry *fse;
V9fsPath path;
virtio_init(vdev, "virtio-9p", VIRTIO_ID_9P,
sizeof(struct virtio_9p_config) + MAX_TAG_LEN);
/* initialize pdu allocator */
QLIST_INIT(&s->free_list);
QLIST_INIT(&s->active_list);
for (i = 0; i < (MAX_REQ - 1); i++) {
QLIST_INSERT_HEAD(&s->free_list, &s->pdus[i], next);
s->pdus[i].s = s;
}
s->vq = virtio_add_queue(vdev, MAX_REQ, handle_9p_output);
v9fs_path_init(&path);
fse = get_fsdev_fsentry(s->fsconf.fsdev_id);
if (!fse) {
/* We don't have a fsdev identified by fsdev_id */
error_setg(errp, "Virtio-9p device couldn't find fsdev with the "
"id = %s",
s->fsconf.fsdev_id ? s->fsconf.fsdev_id : "NULL");
goto out;
}
if (!s->fsconf.tag) {
/* we haven't specified a mount_tag */
error_setg(errp, "fsdev with id %s needs mount_tag arguments",
s->fsconf.fsdev_id);
goto out;
}
s->ctx.export_flags = fse->export_flags;
s->ctx.fs_root = g_strdup(fse->path);
s->ctx.exops.get_st_gen = NULL;
len = strlen(s->fsconf.tag);
if (len > MAX_TAG_LEN - 1) {
error_setg(errp, "mount tag '%s' (%d bytes) is longer than "
"maximum (%d bytes)", s->fsconf.tag, len, MAX_TAG_LEN - 1);
goto out;
}
s->tag = g_strdup(s->fsconf.tag);
s->ctx.uid = -1;
s->ops = fse->ops;
s->config_size = sizeof(struct virtio_9p_config) + len;
s->fid_list = NULL;
qemu_co_rwlock_init(&s->rename_lock);
if (s->ops->init(&s->ctx) < 0) {
error_setg(errp, "Virtio-9p Failed to initialize fs-driver with id:%s"
" and export path:%s", s->fsconf.fsdev_id, s->ctx.fs_root);
goto out;
}
/*
* Check details of export path, We need to use fs driver
* call back to do that. Since we are in the init path, we don't
* use co-routines here.
*/
if (s->ops->name_to_path(&s->ctx, NULL, "/", &path) < 0) {
error_setg(errp,
"error in converting name to path %s", strerror(errno));
goto out;
}
if (s->ops->lstat(&s->ctx, &path, &stat)) {
error_setg(errp, "share path %s does not exist", fse->path);
goto out;
} else if (!S_ISDIR(stat.st_mode)) {
error_setg(errp, "share path %s is not a directory", fse->path);
goto out;
}
v9fs_path_free(&path);
register_savevm(dev, "virtio-9p", -1, 1, virtio_9p_save, virtio_9p_load, s);
return;
out:
g_free(s->ctx.fs_root);
g_free(s->tag);
virtio_cleanup(vdev);
v9fs_path_free(&path);
}
static void virtio_9p_device_unrealize(DeviceState *dev, Error **errp)
{
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
V9fsState *s = VIRTIO_9P(dev);
virtio_cleanup(vdev);
unregister_savevm(dev, "virtio-9p", s);
g_free(s->ctx.fs_root);
g_free(s->tag);
}
ssize_t virtio_pdu_vmarshal(V9fsPDU *pdu, size_t offset,
const char *fmt, va_list ap)
{
return v9fs_iov_vmarshal(pdu->elem.in_sg, pdu->elem.in_num,
offset, 1, fmt, ap);
}
ssize_t virtio_pdu_vunmarshal(V9fsPDU *pdu, size_t offset,
const char *fmt, va_list ap)
{
return v9fs_iov_vunmarshal(pdu->elem.out_sg, pdu->elem.out_num,
offset, 1, fmt, ap);
}
void virtio_init_iov_from_pdu(V9fsPDU *pdu, struct iovec **piov,
unsigned int *pniov, bool is_write)
{
if (is_write) {
*piov = pdu->elem.out_sg;
*pniov = pdu->elem.out_num;
} else {
*piov = pdu->elem.in_sg;
*pniov = pdu->elem.in_num;
}
}
/* virtio-9p device */
static Property virtio_9p_properties[] = {
DEFINE_PROP_STRING("mount_tag", V9fsState, fsconf.tag),
DEFINE_PROP_STRING("fsdev", V9fsState, fsconf.fsdev_id),
DEFINE_PROP_END_OF_LIST(),
};
static void virtio_9p_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
dc->props = virtio_9p_properties;
set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
vdc->realize = virtio_9p_device_realize;
vdc->unrealize = virtio_9p_device_unrealize;
vdc->get_features = virtio_9p_get_features;
vdc->get_config = virtio_9p_get_config;
}
static const TypeInfo virtio_device_info = {
.name = TYPE_VIRTIO_9P,
.parent = TYPE_VIRTIO_DEVICE,
.instance_size = sizeof(V9fsState),
.class_init = virtio_9p_class_init,
};
static void virtio_9p_register_types(void)
{
type_register_static(&virtio_device_info);
}
type_init(virtio_9p_register_types)
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