Exemplo n.º 1
0
static void virtio_blk_handle_request(VirtIOBlockReq *req,
    MultiReqBuffer *mrb)
{
    if (req->elem.out_num < 1 || req->elem.in_num < 1) {
        fprintf(stderr, "virtio-blk missing headers\n");
        exit(1);
    }

    if (req->elem.out_sg[0].iov_len < sizeof(*req->out) ||
        req->elem.in_sg[req->elem.in_num - 1].iov_len < sizeof(*req->in)) {
        fprintf(stderr, "virtio-blk header not in correct element\n");
        exit(1);
    }

    req->out = (void *)req->elem.out_sg[0].iov_base;
    req->in = (void *)req->elem.in_sg[req->elem.in_num - 1].iov_base;

    if (req->out->type & VIRTIO_BLK_T_FLUSH) {
        virtio_blk_handle_flush(req, mrb);
    } else if (req->out->type & VIRTIO_BLK_T_SCSI_CMD) {
        virtio_blk_handle_scsi(req);
    } else if (req->out->type & VIRTIO_BLK_T_OUT) {
        qemu_iovec_init_external(&req->qiov, &req->elem.out_sg[1],
                                 req->elem.out_num - 1);
        virtio_blk_handle_write(req, mrb);
    } else {
        qemu_iovec_init_external(&req->qiov, &req->elem.in_sg[0],
                                 req->elem.in_num - 1);
        virtio_blk_handle_read(req);
    }
}
Exemplo n.º 2
0
static void virtio_blk_handle_request(VirtIOBlockReq *req,
    MultiReqBuffer *mrb)
{
    uint32_t type;

    if (req->elem.out_num < 1 || req->elem.in_num < 1) {
        error_report("virtio-blk missing headers");
        exit(1);
    }

    if (req->elem.out_sg[0].iov_len < sizeof(*req->out) ||
        req->elem.in_sg[req->elem.in_num - 1].iov_len < sizeof(*req->in)) {
        error_report("virtio-blk header not in correct element");
        exit(1);
    }

    req->out = (void *)req->elem.out_sg[0].iov_base;
    req->in = (void *)req->elem.in_sg[req->elem.in_num - 1].iov_base;

    type = ldl_p(&req->out->type);

    if (type & VIRTIO_BLK_T_FLUSH) {
        virtio_blk_handle_flush(req, mrb);
    } else if (type & VIRTIO_BLK_T_SCSI_CMD) {
        virtio_blk_handle_scsi(req);
    } else if (type & VIRTIO_BLK_T_GET_ID) {
        VirtIOBlock *s = req->dev;

        /*
         * NB: per existing s/n string convention the string is
         * terminated by '\0' only when shorter than buffer.
         */
        strncpy(req->elem.in_sg[0].iov_base,
                s->blk.serial ? s->blk.serial : "",
                MIN(req->elem.in_sg[0].iov_len, VIRTIO_BLK_ID_BYTES));
        virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
        g_free(req);
    } else if (type & VIRTIO_BLK_T_OUT) {
        qemu_iovec_init_external(&req->qiov, &req->elem.out_sg[1],
                                 req->elem.out_num - 1);
        virtio_blk_handle_write(req, mrb);
    } else if (type == VIRTIO_BLK_T_IN || type == VIRTIO_BLK_T_BARRIER) {
        /* VIRTIO_BLK_T_IN is 0, so we can't just & it. */
        qemu_iovec_init_external(&req->qiov, &req->elem.in_sg[0],
                                 req->elem.in_num - 1);
        virtio_blk_handle_read(req);
    } else {
        virtio_blk_req_complete(req, VIRTIO_BLK_S_UNSUPP);
        g_free(req);
    }
}
Exemplo n.º 3
0
static void virtio_blk_handle_request(VirtIOBlockReq *req,
    MultiReqBuffer *mrb)
{
    if (req->elem.out_num < 1 || req->elem.in_num < 1) {
        fprintf(stderr, "virtio-blk missing headers\n");
        exit(1);
    }

    if (req->elem.out_sg[0].iov_len < sizeof(*req->out) ||
        req->elem.in_sg[req->elem.in_num - 1].iov_len < sizeof(*req->in)) {
        fprintf(stderr, "virtio-blk header not in correct element\n");
        exit(1);
    }

    req->out = (void *)req->elem.out_sg[0].iov_base;
    req->in = (void *)req->elem.in_sg[req->elem.in_num - 1].iov_base;

    if (req->out->type & VIRTIO_BLK_T_FLUSH) {
        virtio_blk_handle_flush(mrb->blkreq, &mrb->num_writes,
            req, &mrb->old_bs);
    } else if (req->out->type & VIRTIO_BLK_T_SCSI_CMD) {
        virtio_blk_handle_scsi(req);
    } else if (req->out->type & VIRTIO_BLK_T_GET_ID) {
        VirtIOBlock *s = req->dev;

        /*
         * NB: per existing s/n string convention the string is
         * terminated by '\0' only when shorter than buffer.
         */
        strncpy(req->elem.in_sg[0].iov_base,
                s->blk->serial ? s->blk->serial : "",
                MIN(req->elem.in_sg[0].iov_len, VIRTIO_BLK_ID_BYTES));
        virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
        qemu_free(req);
    } else if (req->out->type & VIRTIO_BLK_T_OUT) {
        qemu_iovec_init_external(&req->qiov, &req->elem.out_sg[1],
                                 req->elem.out_num - 1);
        virtio_blk_handle_write(mrb->blkreq, &mrb->num_writes,
            req, &mrb->old_bs);
    } else {
        qemu_iovec_init_external(&req->qiov, &req->elem.in_sg[0],
                                 req->elem.in_num - 1);
        virtio_blk_handle_read(req);
    }
}
Exemplo n.º 4
0
static void virtio_blk_handle_request(VirtIOBlockReq *req,
    MultiReqBuffer *mrb)
{
    uint32_t type;

    if (req->elem.out_num < 1 || req->elem.in_num < 1) {
        error_report("virtio-blk missing headers");
        exit(1);
    }

    if (req->elem.out_sg[0].iov_len < sizeof(*req->out) ||
        req->elem.in_sg[req->elem.in_num - 1].iov_len < sizeof(*req->in)) {
        error_report("virtio-blk header not in correct element");
        exit(1);
    }

    req->out = (void *)req->elem.out_sg[0].iov_base;
    req->in = (void *)req->elem.in_sg[req->elem.in_num - 1].iov_base;

    type = ldl_p(&req->out->type);

    if (type & VIRTIO_BLK_T_FLUSH) {
        virtio_blk_handle_flush(req, mrb);
    } else if (type & VIRTIO_BLK_T_SCSI_CMD) {
        virtio_blk_handle_scsi(req);
    } else if (type & VIRTIO_BLK_T_GET_ID) {
        VirtIOBlock *s = req->dev;

        memcpy(req->elem.in_sg[0].iov_base, s->sn,
               MIN(req->elem.in_sg[0].iov_len, sizeof(s->sn)));
        virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
    } else if (type & VIRTIO_BLK_T_OUT) {
        qemu_iovec_init_external(&req->qiov, &req->elem.out_sg[1],
                                 req->elem.out_num - 1);
        virtio_blk_handle_write(req, mrb);
    } else {
        qemu_iovec_init_external(&req->qiov, &req->elem.in_sg[0],
                                 req->elem.in_num - 1);
        virtio_blk_handle_read(req);
    }
}
Exemplo n.º 5
0
void virtio_blk_handle_request(VirtIOBlockReq *req, MultiReqBuffer *mrb)
{
    uint32_t type;
    struct iovec *in_iov = req->elem->in_sg;
    struct iovec *iov = req->elem->out_sg;
    unsigned in_num = req->elem->in_num;
    unsigned out_num = req->elem->out_num;

    if (req->elem->out_num < 1 || req->elem->in_num < 1) {
        error_report("virtio-blk missing headers");
        exit(1);
    }

    if (unlikely(iov_to_buf(iov, out_num, 0, &req->out,
                            sizeof(req->out)) != sizeof(req->out))) {
        error_report("virtio-blk request outhdr too short");
        exit(1);
    }

    iov_discard_front(&iov, &out_num, sizeof(req->out));

    if (in_num < 1 ||
        in_iov[in_num - 1].iov_len < sizeof(struct virtio_blk_inhdr)) {
        error_report("virtio-blk request inhdr too short");
        exit(1);
    }

    req->in = (void *)in_iov[in_num - 1].iov_base
              + in_iov[in_num - 1].iov_len
              - sizeof(struct virtio_blk_inhdr);
    iov_discard_back(in_iov, &in_num, sizeof(struct virtio_blk_inhdr));

    type = virtio_ldl_p(VIRTIO_DEVICE(req->dev), &req->out.type);

    if (type & VIRTIO_BLK_T_FLUSH) {
        virtio_blk_handle_flush(req, mrb);
    } else if (type & VIRTIO_BLK_T_SCSI_CMD) {
        virtio_blk_handle_scsi(req);
    } else if (type & VIRTIO_BLK_T_GET_ID) {
        VirtIOBlock *s = req->dev;

        /*
         * NB: per existing s/n string convention the string is
         * terminated by '\0' only when shorter than buffer.
         */
        strncpy(req->elem->in_sg[0].iov_base,
                s->blk.serial ? s->blk.serial : "",
                MIN(req->elem->in_sg[0].iov_len, VIRTIO_BLK_ID_BYTES));
        virtio_blk_req_complete(req, VIRTIO_BLK_S_OK);
        virtio_blk_free_request(req);
    } else if (type & VIRTIO_BLK_T_OUT) {
        qemu_iovec_init_external(&req->qiov, &req->elem->out_sg[1],
                                 req->elem->out_num - 1);
        virtio_blk_handle_write(req, mrb);
    } else if (type == VIRTIO_BLK_T_IN || type == VIRTIO_BLK_T_BARRIER) {
        /* VIRTIO_BLK_T_IN is 0, so we can't just & it. */
        qemu_iovec_init_external(&req->qiov, &req->elem->in_sg[0],
                                 req->elem->in_num - 1);
        virtio_blk_handle_read(req);
    } else {
        virtio_blk_req_complete(req, VIRTIO_BLK_S_UNSUPP);
        virtio_blk_free_request(req);
    }
}