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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/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"

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);

    stw_raw(&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)