Add qemu 2.4.0

[kvmfornfv.git] / qemu / hw / 9pfs / virtio-9p-device.c

diff --git a/qemu/hw/9pfs/virtio-9p-device.c b/qemu/hw/9pfs/virtio-9p-device.c
new file mode 100644 (file)
index 0000000..93a407c
--- /dev/null
+++ b/qemu/hw/9pfs/virtio-9p-device.c
@@ -0,0 +1,173 @@
+/*
+ * 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_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_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->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)