/* * 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 uint32_t virtio_9p_get_features(VirtIODevice *vdev, uint32_t features) { features |= 1 << 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_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; } if (v9fs_init_worker_threads() < 0) { error_setg(errp, "worker thread initialization failed"); 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); return; out: g_free(s->ctx.fs_root); g_free(s->tag); virtio_cleanup(vdev); v9fs_path_free(&path); } /* virtio-9p device */ static Property virtio_9p_properties[] = { DEFINE_VIRTIO_9P_PROPERTIES(V9fsState, fsconf), 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->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)