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-rw-r--r--src/hw/9pfs/virtio-9p-device.c192
1 files changed, 192 insertions, 0 deletions
diff --git a/src/hw/9pfs/virtio-9p-device.c b/src/hw/9pfs/virtio-9p-device.c
new file mode 100644
index 0000000..b42d3b3
--- /dev/null
+++ b/src/hw/9pfs/virtio-9p-device.c
@@ -0,0 +1,192 @@
+/*
+ * 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/virtio/virtio-9p.h"
+#include "hw/i386/pc.h"
+#include "qemu/sockets.h"
+#include "virtio-9p.h"
+#include "fsdev/qemu-fsdev.h"
+#include "virtio-9p-xattr.h"
+#include "virtio-9p-coth.h"
+#include "hw/virtio/virtio-access.h"
+
+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->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);
+}
+
+/* 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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