예제 #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);
    }
}
예제 #2
0
파일: virtio-blk.c 프로젝트: ddk50/ibkvm
static void virtio_blk_handle_output(VirtIODevice *vdev, VirtQueue *vq)
{
    VirtIOBlock *s = to_virtio_blk(vdev);
    VirtIOBlockReq *req;

    while ((req = virtio_blk_get_request(s))) {
        int i;

        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_SCSI_CMD) {
            unsigned int len = sizeof(*req->in);

            req->in->status = VIRTIO_BLK_S_UNSUPP;
            virtqueue_push(vq, &req->elem, len);
            virtio_notify(vdev, vq);
            qemu_free(req);
        } else if (req->out->type & VIRTIO_BLK_T_OUT) {
            if (virtio_blk_handle_write(req) < 0)
                break;
        } else {
            for (i = 0; i < req->elem.in_num - 1; i++)
                req->size += req->elem.in_sg[i].iov_len;

            req->buffer = qemu_memalign(512, req->size);
            if (req->buffer == NULL) {
                qemu_free(req);
                break;
            }

            bdrv_aio_read(s->bs, req->out->sector,
                          req->buffer,
                          req->size / 512,
                          virtio_blk_rw_complete,
                          req);
        }
    }
    /*
     * FIXME: Want to check for completions before returning to guest mode,
     * so cached reads and writes are reported as quickly as possible. But
     * that should be done in the generic block layer.
     */
}
예제 #3
0
파일: virtio-blk.c 프로젝트: wdc-tools/qemu
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);
    }
}
예제 #4
0
파일: virtio-blk.c 프로젝트: ddk50/ibkvm
static void virtio_blk_dma_restart_cb(void *opaque, int running, int reason)
{
    VirtIOBlock *s = opaque;
    VirtIOBlockReq *req = s->rq;

    if (!running)
        return;

    s->rq = NULL;

    while (req) {
        virtio_blk_handle_write(req);
        req = req->next;
    }
}
예제 #5
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);
    }
}
예제 #6
0
파일: virtio-blk.c 프로젝트: dtatulea/qemu
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);
    }
}
예제 #7
0
파일: virtio-blk.c 프로젝트: Samsara00/qemu
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);
    }
}