Now when you try to migrate with VirtFS export path mounted, you get a proper QMP error: (qemu) migrate tcp:localhost:4444 Migration is disabled when VirtFS export path '/tmp/' is mounted in the guest using mount_tag 'v_tmp' (qemu) Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
189 lines
5.6 KiB
C
189 lines
5.6 KiB
C
/*
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* Virtio 9p backend
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*
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* Copyright IBM, Corp. 2010
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#include "hw/virtio.h"
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#include "hw/pc.h"
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#include "qemu_socket.h"
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#include "hw/virtio-pci.h"
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#include "virtio-9p.h"
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#include "fsdev/qemu-fsdev.h"
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#include "virtio-9p-xattr.h"
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#include "virtio-9p-coth.h"
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static uint32_t virtio_9p_get_features(VirtIODevice *vdev, uint32_t features)
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{
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features |= 1 << VIRTIO_9P_MOUNT_TAG;
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return features;
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}
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static V9fsState *to_virtio_9p(VirtIODevice *vdev)
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{
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return (V9fsState *)vdev;
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}
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static void virtio_9p_get_config(VirtIODevice *vdev, uint8_t *config)
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{
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int len;
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struct virtio_9p_config *cfg;
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V9fsState *s = to_virtio_9p(vdev);
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len = strlen(s->tag);
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cfg = g_malloc0(sizeof(struct virtio_9p_config) + len);
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stw_raw(&cfg->tag_len, len);
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/* We don't copy the terminating null to config space */
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memcpy(cfg->tag, s->tag, len);
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memcpy(config, cfg, s->config_size);
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g_free(cfg);
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}
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VirtIODevice *virtio_9p_init(DeviceState *dev, V9fsConf *conf)
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{
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V9fsState *s;
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int i, len;
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struct stat stat;
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FsDriverEntry *fse;
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V9fsPath path;
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s = (V9fsState *)virtio_common_init("virtio-9p",
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VIRTIO_ID_9P,
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sizeof(struct virtio_9p_config)+
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MAX_TAG_LEN,
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sizeof(V9fsState));
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/* initialize pdu allocator */
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QLIST_INIT(&s->free_list);
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QLIST_INIT(&s->active_list);
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for (i = 0; i < (MAX_REQ - 1); i++) {
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QLIST_INSERT_HEAD(&s->free_list, &s->pdus[i], next);
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}
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s->vq = virtio_add_queue(&s->vdev, MAX_REQ, handle_9p_output);
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fse = get_fsdev_fsentry(conf->fsdev_id);
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if (!fse) {
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/* We don't have a fsdev identified by fsdev_id */
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fprintf(stderr, "Virtio-9p device couldn't find fsdev with the "
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"id = %s\n", conf->fsdev_id ? conf->fsdev_id : "NULL");
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exit(1);
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}
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if (!fse->path || !conf->tag) {
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/* we haven't specified a mount_tag or the path */
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fprintf(stderr, "fsdev with id %s needs path "
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"and Virtio-9p device needs mount_tag arguments\n",
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conf->fsdev_id);
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exit(1);
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}
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s->ctx.export_flags = fse->export_flags;
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s->ctx.fs_root = g_strdup(fse->path);
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s->ctx.exops.get_st_gen = NULL;
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if (fse->export_flags & V9FS_SM_PASSTHROUGH) {
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s->ctx.xops = passthrough_xattr_ops;
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} else if (fse->export_flags & V9FS_SM_MAPPED) {
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s->ctx.xops = mapped_xattr_ops;
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} else if (fse->export_flags & V9FS_SM_NONE) {
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s->ctx.xops = none_xattr_ops;
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}
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len = strlen(conf->tag);
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if (len > MAX_TAG_LEN - 1) {
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fprintf(stderr, "mount tag '%s' (%d bytes) is longer than "
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"maximum (%d bytes)", conf->tag, len, MAX_TAG_LEN - 1);
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exit(1);
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}
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s->tag = strdup(conf->tag);
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s->ctx.uid = -1;
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s->ops = fse->ops;
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s->vdev.get_features = virtio_9p_get_features;
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s->config_size = sizeof(struct virtio_9p_config) + len;
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s->vdev.get_config = virtio_9p_get_config;
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s->fid_list = NULL;
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qemu_co_rwlock_init(&s->rename_lock);
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if (s->ops->init(&s->ctx) < 0) {
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fprintf(stderr, "Virtio-9p Failed to initialize fs-driver with id:%s"
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" and export path:%s\n", conf->fsdev_id, s->ctx.fs_root);
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exit(1);
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}
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if (v9fs_init_worker_threads() < 0) {
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fprintf(stderr, "worker thread initialization failed\n");
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exit(1);
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}
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/*
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* Check details of export path, We need to use fs driver
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* call back to do that. Since we are in the init path, we don't
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* use co-routines here.
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*/
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v9fs_path_init(&path);
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if (s->ops->name_to_path(&s->ctx, NULL, "/", &path) < 0) {
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fprintf(stderr,
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"error in converting name to path %s", strerror(errno));
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exit(1);
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}
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if (s->ops->lstat(&s->ctx, &path, &stat)) {
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fprintf(stderr, "share path %s does not exist\n", fse->path);
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exit(1);
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} else if (!S_ISDIR(stat.st_mode)) {
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fprintf(stderr, "share path %s is not a directory\n", fse->path);
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exit(1);
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}
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v9fs_path_free(&path);
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return &s->vdev;
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}
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static int virtio_9p_init_pci(PCIDevice *pci_dev)
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{
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VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
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VirtIODevice *vdev;
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vdev = virtio_9p_init(&pci_dev->qdev, &proxy->fsconf);
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vdev->nvectors = proxy->nvectors;
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virtio_init_pci(proxy, vdev);
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/* make the actual value visible */
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proxy->nvectors = vdev->nvectors;
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return 0;
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}
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static PCIDeviceInfo virtio_9p_info = {
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.qdev.name = "virtio-9p-pci",
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.qdev.size = sizeof(VirtIOPCIProxy),
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.init = virtio_9p_init_pci,
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.vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET,
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.device_id = 0x1009,
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.revision = VIRTIO_PCI_ABI_VERSION,
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.class_id = 0x2,
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.qdev.props = (Property[]) {
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DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags,
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VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true),
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DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, 2),
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DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features),
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DEFINE_PROP_STRING("mount_tag", VirtIOPCIProxy, fsconf.tag),
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DEFINE_PROP_STRING("fsdev", VirtIOPCIProxy, fsconf.fsdev_id),
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DEFINE_PROP_END_OF_LIST(),
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}
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};
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static void virtio_9p_register_devices(void)
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{
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pci_qdev_register(&virtio_9p_info);
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virtio_9p_set_fd_limit();
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}
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device_init(virtio_9p_register_devices)
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