LXR qemu/hw/9pfs/virtio-9p-device.c

   1/*
   2 * Virtio 9p backend
   3 *
   4 * Copyright IBM, Corp. 2010
   5 *
   6 * Authors:
   7 *  Anthony Liguori   <aliguori@us.ibm.com>
   8 *
   9 * This work is licensed under the terms of the GNU GPL, version 2.  See
  10 * the COPYING file in the top-level directory.
  11 *
  12 */
  13
  14#include "hw/virtio/virtio.h"
  15#include "hw/virtio/virtio-9p.h"
  16#include "hw/i386/pc.h"
  17#include "qemu/sockets.h"
  18#include "virtio-9p.h"
  19#include "fsdev/qemu-fsdev.h"
  20#include "virtio-9p-xattr.h"
  21#include "virtio-9p-coth.h"
  22
  23static uint32_t virtio_9p_get_features(VirtIODevice *vdev, uint32_t features)
  24{
  25    features |= 1 << VIRTIO_9P_MOUNT_TAG;
  26    return features;
  27}
  28
  29static void virtio_9p_get_config(VirtIODevice *vdev, uint8_t *config)
  30{
  31    int len;
  32    struct virtio_9p_config *cfg;
  33    V9fsState *s = VIRTIO_9P(vdev);
  34
  35    len = strlen(s->tag);
  36    cfg = g_malloc0(sizeof(struct virtio_9p_config) + len);
  37    stw_raw(&cfg->tag_len, len);
  38    /* We don't copy the terminating null to config space */
  39    memcpy(cfg->tag, s->tag, len);
  40    memcpy(config, cfg, s->config_size);
  41    g_free(cfg);
  42}
  43
  44static int virtio_9p_device_init(VirtIODevice *vdev)
  45{
  46    V9fsState *s = VIRTIO_9P(vdev);
  47    int i, len;
  48    struct stat stat;
  49    FsDriverEntry *fse;
  50    V9fsPath path;
  51
  52    virtio_init(VIRTIO_DEVICE(s), "virtio-9p", VIRTIO_ID_9P,
  53                sizeof(struct virtio_9p_config) + MAX_TAG_LEN);
  54
  55    /* initialize pdu allocator */
  56    QLIST_INIT(&s->free_list);
  57    QLIST_INIT(&s->active_list);
  58    for (i = 0; i < (MAX_REQ - 1); i++) {
  59        QLIST_INSERT_HEAD(&s->free_list, &s->pdus[i], next);
  60    }
  61
  62    s->vq = virtio_add_queue(vdev, MAX_REQ, handle_9p_output);
  63
  64    v9fs_path_init(&path);
  65
  66    fse = get_fsdev_fsentry(s->fsconf.fsdev_id);
  67
  68    if (!fse) {
  69        /* We don't have a fsdev identified by fsdev_id */
  70        fprintf(stderr, "Virtio-9p device couldn't find fsdev with the "
  71                "id = %s\n",
  72                s->fsconf.fsdev_id ? s->fsconf.fsdev_id : "NULL");
  73        goto out;
  74    }
  75
  76    if (!s->fsconf.tag) {
  77        /* we haven't specified a mount_tag */
  78        fprintf(stderr, "fsdev with id %s needs mount_tag arguments\n",
  79                s->fsconf.fsdev_id);
  80        goto out;
  81    }
  82
  83    s->ctx.export_flags = fse->export_flags;
  84    s->ctx.fs_root = g_strdup(fse->path);
  85    s->ctx.exops.get_st_gen = NULL;
  86    len = strlen(s->fsconf.tag);
  87    if (len > MAX_TAG_LEN - 1) {
  88        fprintf(stderr, "mount tag '%s' (%d bytes) is longer than "
  89                "maximum (%d bytes)", s->fsconf.tag, len, MAX_TAG_LEN - 1);
  90        goto out;
  91    }
  92
  93    s->tag = g_strdup(s->fsconf.tag);
  94    s->ctx.uid = -1;
  95
  96    s->ops = fse->ops;
  97    s->config_size = sizeof(struct virtio_9p_config) + len;
  98    s->fid_list = NULL;
  99    qemu_co_rwlock_init(&s->rename_lock);
 100
 101    if (s->ops->init(&s->ctx) < 0) {
 102        fprintf(stderr, "Virtio-9p Failed to initialize fs-driver with id:%s"
 103                " and export path:%s\n", s->fsconf.fsdev_id, s->ctx.fs_root);
 104        goto out;
 105    }
 106    if (v9fs_init_worker_threads() < 0) {
 107        fprintf(stderr, "worker thread initialization failed\n");
 108        goto out;
 109    }
 110
 111    /*
 112     * Check details of export path, We need to use fs driver
 113     * call back to do that. Since we are in the init path, we don't
 114     * use co-routines here.
 115     */
 116    if (s->ops->name_to_path(&s->ctx, NULL, "/", &path) < 0) {
 117        fprintf(stderr,
 118                "error in converting name to path %s", strerror(errno));
 119        goto out;
 120    }
 121    if (s->ops->lstat(&s->ctx, &path, &stat)) {
 122        fprintf(stderr, "share path %s does not exist\n", fse->path);
 123        goto out;
 124    } else if (!S_ISDIR(stat.st_mode)) {
 125        fprintf(stderr, "share path %s is not a directory\n", fse->path);
 126        goto out;
 127    }
 128    v9fs_path_free(&path);
 129
 130    return 0;
 131out:
 132    g_free(s->ctx.fs_root);
 133    g_free(s->tag);
 134    virtio_cleanup(vdev);
 135    v9fs_path_free(&path);
 136
 137    return -1;
 138
 139}
 140
 141/* virtio-9p device */
 142
 143static Property virtio_9p_properties[] = {
 144    DEFINE_VIRTIO_9P_PROPERTIES(V9fsState, fsconf),
 145    DEFINE_PROP_END_OF_LIST(),
 146};
 147
 148static void virtio_9p_class_init(ObjectClass *klass, void *data)
 149{
 150    DeviceClass *dc = DEVICE_CLASS(klass);
 151    VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
 152    dc->props = virtio_9p_properties;
 153    set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
 154    vdc->init = virtio_9p_device_init;
 155    vdc->get_features = virtio_9p_get_features;
 156    vdc->get_config = virtio_9p_get_config;
 157}
 158
 159static const TypeInfo virtio_device_info = {
 160    .name = TYPE_VIRTIO_9P,
 161    .parent = TYPE_VIRTIO_DEVICE,
 162    .instance_size = sizeof(V9fsState),
 163    .class_init = virtio_9p_class_init,
 164};
 165
 166static void virtio_9p_register_types(void)
 167{
 168    type_register_static(&virtio_device_info);
 169}
 170
 171type_init(virtio_9p_register_types)
 172