示例#1
0
int iscsi_readcapacity10_async(struct iscsi_context *iscsi, int lun, iscsi_command_cb cb, int lba, int pmi, void *private_data)
{
    struct scsi_task *task;
    int ret;

    if ((task = scsi_cdb_readcapacity10(lba, pmi)) == NULL) {
        printf("Failed to create readcapacity10 cdb\n");
        return -1;
    }
    ret = iscsi_scsi_command_async(iscsi, lun, task, cb, NULL, private_data);

    return ret;
}
示例#2
0
int iscsi_modesense6_async(struct iscsi_context *iscsi, int lun, iscsi_command_cb cb, int dbd, int pc, int page_code, int sub_page_code, unsigned char alloc_len, void *private_data)
{
    struct scsi_task *task;
    int ret;

    if ((task = scsi_cdb_modesense6(dbd, pc, page_code, sub_page_code, alloc_len)) == NULL) {
        printf("Failed to create modesense6 cdb\n");
        return -2;
    }
    ret = iscsi_scsi_command_async(iscsi, lun, task, cb, NULL, private_data);

    return ret;
}
示例#3
0
int iscsi_inquiry_async(struct iscsi_context *iscsi, int lun, iscsi_command_cb cb, int evpd, int page_code, int maxsize, void *private_data)
{
    struct scsi_task *task;
    int ret;

    if ((task = scsi_cdb_inquiry(evpd, page_code, maxsize)) == NULL) {
        printf("Failed to create inquiry cdb\n");
        return -1;
    }
    ret = iscsi_scsi_command_async(iscsi, lun, task, cb, NULL, private_data);

    return ret;
}
示例#4
0
int iscsi_testunitready_async(struct iscsi_context *iscsi, int lun, iscsi_command_cb cb, void *private_data)
{
    struct scsi_task *task;
    int ret;

    if ((task = scsi_cdb_testunitready()) == NULL) {
        printf("Failed to create testunitready cdb\n");
        return -1;
    }
    ret = iscsi_scsi_command_async(iscsi, lun, task, cb, NULL, private_data);

    return ret;
}
示例#5
0
int iscsi_read10_async(struct iscsi_context *iscsi, int lun, iscsi_command_cb cb, int lba, int datalen, int blocksize, void *private_data)
{
    struct scsi_task *task;
    int ret;

    if (datalen % blocksize != 0) {
        printf("datalen:%d is not a multiple of the blocksize:%d\n", datalen, blocksize);
        return -1;
    }

    if ((task = scsi_cdb_read10(lba, datalen, blocksize)) == NULL) {
        printf("Failed to create read10 cdb\n");
        return -2;
    }
    ret = iscsi_scsi_command_async(iscsi, lun, task, cb, NULL, private_data);

    return ret;
}
示例#6
0
int iscsi_reportluns_async(struct iscsi_context *iscsi, iscsi_command_cb cb, int report_type, int alloc_len, void *private_data)
{
    struct scsi_task *task;
    int ret;

    if (alloc_len < 16) {
        printf("Minimum allowed alloc len for reportluns is 16. You specified %d\n", alloc_len);
        return -1;
    }

    if ((task = scsi_reportluns_cdb(report_type, alloc_len)) == NULL) {
        printf("Failed to create reportluns cdb\n");
        return -2;
    }
    /* report luns are always sent to lun 0 */
    ret = iscsi_scsi_command_async(iscsi, 0, task, cb, NULL, private_data);

    return ret;
}
示例#7
0
int iscsi_write10_async(struct iscsi_context *iscsi, int lun, iscsi_command_cb cb, unsigned char *data, int datalen, int lba, int fua, int fuanv, int blocksize, void *private_data)
{
    struct scsi_task *task;
    struct iscsi_data outdata;
    int ret;

    if (datalen % blocksize != 0) {
        printf("datalen:%d is not a multiple of the blocksize:%d\n", datalen, blocksize);
        return -1;
    }

    if ((task = scsi_cdb_write10(lba, datalen, fua, fuanv, blocksize)) == NULL) {
        printf("Failed to create read10 cdb\n");
        return -2;
    }

    outdata.data = data;
    outdata.size = datalen;

    ret = iscsi_scsi_command_async(iscsi, lun, task, cb, &outdata, private_data);

    return ret;
}
示例#8
0
static BlockDriverAIOCB *iscsi_aio_ioctl(BlockDriverState *bs,
        unsigned long int req, void *buf,
        BlockDriverCompletionFunc *cb, void *opaque)
{
    IscsiLun *iscsilun = bs->opaque;
    struct iscsi_context *iscsi = iscsilun->iscsi;
    struct iscsi_data data;
    IscsiAIOCB *acb;

    assert(req == SG_IO);

    acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque);

    acb->iscsilun = iscsilun;
    acb->canceled    = 0;
    acb->bh          = NULL;
    acb->status      = -EINPROGRESS;
    acb->buf         = NULL;
    acb->ioh         = buf;

    acb->task = malloc(sizeof(struct scsi_task));
    if (acb->task == NULL) {
        error_report("iSCSI: Failed to allocate task for scsi command. %s",
                     iscsi_get_error(iscsi));
        qemu_aio_release(acb);
        return NULL;
    }
    memset(acb->task, 0, sizeof(struct scsi_task));

    switch (acb->ioh->dxfer_direction) {
    case SG_DXFER_TO_DEV:
        acb->task->xfer_dir = SCSI_XFER_WRITE;
        break;
    case SG_DXFER_FROM_DEV:
        acb->task->xfer_dir = SCSI_XFER_READ;
        break;
    default:
        acb->task->xfer_dir = SCSI_XFER_NONE;
        break;
    }

    acb->task->cdb_size = acb->ioh->cmd_len;
    memcpy(&acb->task->cdb[0], acb->ioh->cmdp, acb->ioh->cmd_len);
    acb->task->expxferlen = acb->ioh->dxfer_len;

    data.size = 0;
    if (acb->task->xfer_dir == SCSI_XFER_WRITE) {
        if (acb->ioh->iovec_count == 0) {
            data.data = acb->ioh->dxferp;
            data.size = acb->ioh->dxfer_len;
        } else {
#if defined(LIBISCSI_FEATURE_IOVECTOR)
            scsi_task_set_iov_out(acb->task,
                                 (struct scsi_iovec *) acb->ioh->dxferp,
                                 acb->ioh->iovec_count);
#else
            struct iovec *iov = (struct iovec *)acb->ioh->dxferp;

            acb->buf = g_malloc(acb->ioh->dxfer_len);
            data.data = acb->buf;
            data.size = iov_to_buf(iov, acb->ioh->iovec_count, 0,
                                   acb->buf, acb->ioh->dxfer_len);
#endif
        }
    }

    if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task,
                                 iscsi_aio_ioctl_cb,
                                 (data.size > 0) ? &data : NULL,
                                 acb) != 0) {
        scsi_free_scsi_task(acb->task);
        qemu_aio_release(acb);
        return NULL;
    }

    /* tell libiscsi to read straight into the buffer we got from ioctl */
    if (acb->task->xfer_dir == SCSI_XFER_READ) {
        if (acb->ioh->iovec_count == 0) {
            scsi_task_add_data_in_buffer(acb->task,
                                         acb->ioh->dxfer_len,
                                         acb->ioh->dxferp);
        } else {
#if defined(LIBISCSI_FEATURE_IOVECTOR)
            scsi_task_set_iov_in(acb->task,
                                 (struct scsi_iovec *) acb->ioh->dxferp,
                                 acb->ioh->iovec_count);
#else
            int i;
            for (i = 0; i < acb->ioh->iovec_count; i++) {
                struct iovec *iov = (struct iovec *)acb->ioh->dxferp;

                scsi_task_add_data_in_buffer(acb->task,
                    iov[i].iov_len,
                    iov[i].iov_base);
            }
#endif
        }
    }

    iscsi_set_events(iscsilun);

    return &acb->common;
}
示例#9
0
static int
iscsi_aio_readv_acb(IscsiAIOCB *acb)
{
    struct iscsi_context *iscsi = acb->iscsilun->iscsi;
    size_t size;
    uint64_t lba;
    uint32_t num_sectors;
    int ret;
#if !defined(LIBISCSI_FEATURE_IOVECTOR)
    int i;
#endif

    acb->canceled    = 0;
    acb->bh          = NULL;
    acb->status      = -EINPROGRESS;
    acb->buf         = NULL;

    size = acb->nb_sectors * BDRV_SECTOR_SIZE;

    acb->task = malloc(sizeof(struct scsi_task));
    if (acb->task == NULL) {
        error_report("iSCSI: Failed to allocate task for scsi READ16 "
                     "command. %s", iscsi_get_error(iscsi));
        return -1;
    }
    memset(acb->task, 0, sizeof(struct scsi_task));

    acb->task->xfer_dir = SCSI_XFER_READ;
    acb->task->expxferlen = size;
    lba = sector_qemu2lun(acb->sector_num, acb->iscsilun);
    num_sectors = sector_qemu2lun(acb->nb_sectors, acb->iscsilun);

    switch (acb->iscsilun->type) {
    case TYPE_DISK:
        acb->task->cdb_size = 16;
        acb->task->cdb[0]  = 0x88;
        *(uint32_t *)&acb->task->cdb[2]  = htonl(lba >> 32);
        *(uint32_t *)&acb->task->cdb[6]  = htonl(lba & 0xffffffff);
        *(uint32_t *)&acb->task->cdb[10] = htonl(num_sectors);
        break;
    default:
        acb->task->cdb_size = 10;
        acb->task->cdb[0]  = 0x28;
        *(uint32_t *)&acb->task->cdb[2] = htonl(lba);
        *(uint16_t *)&acb->task->cdb[7] = htons(num_sectors);
        break;
    }

    ret = iscsi_scsi_command_async(iscsi, acb->iscsilun->lun, acb->task,
                                   iscsi_aio_read16_cb,
                                   NULL,
                                   acb);
    if (ret != 0) {
        scsi_free_scsi_task(acb->task);
        return -1;
    }

#if defined(LIBISCSI_FEATURE_IOVECTOR)
    scsi_task_set_iov_in(acb->task, (struct scsi_iovec*) acb->qiov->iov, acb->qiov->niov);
#else
    for (i = 0; i < acb->qiov->niov; i++) {
        scsi_task_add_data_in_buffer(acb->task,
                acb->qiov->iov[i].iov_len,
                acb->qiov->iov[i].iov_base);
    }
#endif
    return 0;
}
示例#10
0
static int
iscsi_aio_writev_acb(IscsiAIOCB *acb)
{
    struct iscsi_context *iscsi = acb->iscsilun->iscsi;
    size_t size;
    uint32_t num_sectors;
    uint64_t lba;
#if !defined(LIBISCSI_FEATURE_IOVECTOR)
    struct iscsi_data data;
#endif
    int ret;

    acb->canceled   = 0;
    acb->bh         = NULL;
    acb->status     = -EINPROGRESS;
    acb->buf        = NULL;

    /* this will allow us to get rid of 'buf' completely */
    size = acb->nb_sectors * BDRV_SECTOR_SIZE;

#if !defined(LIBISCSI_FEATURE_IOVECTOR)
    data.size = MIN(size, acb->qiov->size);

    /* if the iovec only contains one buffer we can pass it directly */
    if (acb->qiov->niov == 1) {
        data.data = acb->qiov->iov[0].iov_base;
    } else {
        acb->buf = g_malloc(data.size);
        qemu_iovec_to_buf(acb->qiov, 0, acb->buf, data.size);
        data.data = acb->buf;
    }
#endif

    acb->task = malloc(sizeof(struct scsi_task));
    if (acb->task == NULL) {
        error_report("iSCSI: Failed to allocate task for scsi WRITE16 "
                     "command. %s", iscsi_get_error(iscsi));
        return -1;
    }
    memset(acb->task, 0, sizeof(struct scsi_task));

    acb->task->xfer_dir = SCSI_XFER_WRITE;
    acb->task->cdb_size = 16;
    acb->task->cdb[0] = 0x8a;
    lba = sector_qemu2lun(acb->sector_num, acb->iscsilun);
    *(uint32_t *)&acb->task->cdb[2]  = htonl(lba >> 32);
    *(uint32_t *)&acb->task->cdb[6]  = htonl(lba & 0xffffffff);
    num_sectors = sector_qemu2lun(acb->nb_sectors, acb->iscsilun);
    *(uint32_t *)&acb->task->cdb[10] = htonl(num_sectors);
    acb->task->expxferlen = size;

#if defined(LIBISCSI_FEATURE_IOVECTOR)
    ret = iscsi_scsi_command_async(iscsi, acb->iscsilun->lun, acb->task,
                                   iscsi_aio_write16_cb,
                                   NULL,
                                   acb);
#else
    ret = iscsi_scsi_command_async(iscsi, acb->iscsilun->lun, acb->task,
                                   iscsi_aio_write16_cb,
                                   &data,
                                   acb);
#endif
    if (ret != 0) {
        scsi_free_scsi_task(acb->task);
        g_free(acb->buf);
        return -1;
    }

#if defined(LIBISCSI_FEATURE_IOVECTOR)
    scsi_task_set_iov_out(acb->task, (struct scsi_iovec*) acb->qiov->iov, acb->qiov->niov);
#endif

    return 0;
}
示例#11
0
static BlockDriverAIOCB *
iscsi_aio_readv(BlockDriverState *bs, int64_t sector_num,
                QEMUIOVector *qiov, int nb_sectors,
                BlockDriverCompletionFunc *cb,
                void *opaque)
{
    IscsiLun *iscsilun = bs->opaque;
    struct iscsi_context *iscsi = iscsilun->iscsi;
    IscsiAIOCB *acb;
    size_t qemu_read_size;
    int i;
    uint64_t lba;
    uint32_t num_sectors;

    qemu_read_size = BDRV_SECTOR_SIZE * (size_t)nb_sectors;

    acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque);
    trace_iscsi_aio_readv(iscsi, sector_num, nb_sectors, opaque, acb);

    acb->iscsilun = iscsilun;
    acb->qiov     = qiov;

    acb->canceled    = 0;
    acb->bh          = NULL;
    acb->status      = -EINPROGRESS;
    acb->read_size   = qemu_read_size;
    acb->buf         = NULL;

    /* If LUN blocksize is bigger than BDRV_BLOCK_SIZE a read from QEMU
     * may be misaligned to the LUN, so we may need to read some extra
     * data.
     */
    acb->read_offset = 0;
    if (iscsilun->block_size > BDRV_SECTOR_SIZE) {
        uint64_t bdrv_offset = BDRV_SECTOR_SIZE * sector_num;

        acb->read_offset  = bdrv_offset % iscsilun->block_size;
    }

    num_sectors  = (qemu_read_size + iscsilun->block_size
                    + acb->read_offset - 1)
                    / iscsilun->block_size;

    acb->task = malloc(sizeof(struct scsi_task));
    if (acb->task == NULL) {
        error_report("iSCSI: Failed to allocate task for scsi READ16 "
                     "command. %s", iscsi_get_error(iscsi));
        qemu_aio_release(acb);
        return NULL;
    }
    memset(acb->task, 0, sizeof(struct scsi_task));

    acb->task->xfer_dir = SCSI_XFER_READ;
    lba = sector_qemu2lun(sector_num, iscsilun);
    acb->task->expxferlen = qemu_read_size;

    switch (iscsilun->type) {
    case TYPE_DISK:
        acb->task->cdb_size = 16;
        acb->task->cdb[0]  = 0x88;
        *(uint32_t *)&acb->task->cdb[2]  = htonl(lba >> 32);
        *(uint32_t *)&acb->task->cdb[6]  = htonl(lba & 0xffffffff);
        *(uint32_t *)&acb->task->cdb[10] = htonl(num_sectors);
        break;
    default:
        acb->task->cdb_size = 10;
        acb->task->cdb[0]  = 0x28;
        *(uint32_t *)&acb->task->cdb[2] = htonl(lba);
        *(uint16_t *)&acb->task->cdb[7] = htons(num_sectors);
        break;
    }

    if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task,
                                 iscsi_aio_read16_cb,
                                 NULL,
                                 acb) != 0) {
        scsi_free_scsi_task(acb->task);
        qemu_aio_release(acb);
        return NULL;
    }

    for (i = 0; i < acb->qiov->niov; i++) {
        scsi_task_add_data_in_buffer(acb->task,
                acb->qiov->iov[i].iov_len,
                acb->qiov->iov[i].iov_base);
    }

    iscsi_set_events(iscsilun);

    return &acb->common;
}
示例#12
0
static BlockDriverAIOCB *
iscsi_aio_writev(BlockDriverState *bs, int64_t sector_num,
                 QEMUIOVector *qiov, int nb_sectors,
                 BlockDriverCompletionFunc *cb,
                 void *opaque)
{
    IscsiLun *iscsilun = bs->opaque;
    struct iscsi_context *iscsi = iscsilun->iscsi;
    IscsiAIOCB *acb;
    size_t size;
    uint32_t num_sectors;
    uint64_t lba;
    struct iscsi_data data;

    acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque);
    trace_iscsi_aio_writev(iscsi, sector_num, nb_sectors, opaque, acb);

    acb->iscsilun = iscsilun;
    acb->qiov     = qiov;

    acb->canceled   = 0;
    acb->bh         = NULL;
    acb->status     = -EINPROGRESS;

    /* XXX we should pass the iovec to write16 to avoid the extra copy */
    /* this will allow us to get rid of 'buf' completely */
    size = nb_sectors * BDRV_SECTOR_SIZE;
    data.size = MIN(size, acb->qiov->size);

    /* if the iovec only contains one buffer we can pass it directly */
    if (acb->qiov->niov == 1) {
        acb->buf = NULL;
        data.data = acb->qiov->iov[0].iov_base;
    } else {
        acb->buf = g_malloc(data.size);
        qemu_iovec_to_buf(acb->qiov, 0, acb->buf, data.size);
        data.data = acb->buf;
    }

    acb->task = malloc(sizeof(struct scsi_task));
    if (acb->task == NULL) {
        error_report("iSCSI: Failed to allocate task for scsi WRITE16 "
                     "command. %s", iscsi_get_error(iscsi));
        qemu_aio_release(acb);
        return NULL;
    }
    memset(acb->task, 0, sizeof(struct scsi_task));

    acb->task->xfer_dir = SCSI_XFER_WRITE;
    acb->task->cdb_size = 16;
    acb->task->cdb[0] = 0x8a;
    lba = sector_qemu2lun(sector_num, iscsilun);
    *(uint32_t *)&acb->task->cdb[2]  = htonl(lba >> 32);
    *(uint32_t *)&acb->task->cdb[6]  = htonl(lba & 0xffffffff);
    num_sectors = size / iscsilun->block_size;
    *(uint32_t *)&acb->task->cdb[10] = htonl(num_sectors);
    acb->task->expxferlen = size;

    if (iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task,
                                 iscsi_aio_write16_cb,
                                 &data,
                                 acb) != 0) {
        scsi_free_scsi_task(acb->task);
        g_free(acb->buf);
        qemu_aio_release(acb);
        return NULL;
    }

    iscsi_set_events(iscsilun);

    return &acb->common;
}
示例#13
0
static int
iscsi_aio_readv_acb(IscsiAIOCB *acb)
{
    struct iscsi_context *iscsi = acb->iscsilun->iscsi;
    uint64_t lba;
    uint32_t num_sectors;
    int ret;
#if !defined(LIBISCSI_FEATURE_IOVECTOR)
    int i;
#endif

    acb->canceled    = 0;
    acb->bh          = NULL;
    acb->status      = -EINPROGRESS;
    acb->buf         = NULL;

    /* If LUN blocksize is bigger than BDRV_BLOCK_SIZE a read from QEMU
     * may be misaligned to the LUN, so we may need to read some extra
     * data.
     */
    acb->read_offset = 0;
    if (acb->iscsilun->block_size > BDRV_SECTOR_SIZE) {
        uint64_t bdrv_offset = BDRV_SECTOR_SIZE * acb->sector_num;

        acb->read_offset  = bdrv_offset % acb->iscsilun->block_size;
    }

    num_sectors  = (acb->read_size + acb->iscsilun->block_size
                    + acb->read_offset - 1)
                    / acb->iscsilun->block_size;

    acb->task = malloc(sizeof(struct scsi_task));
    if (acb->task == NULL) {
        error_report("iSCSI: Failed to allocate task for scsi READ16 "
                     "command. %s", iscsi_get_error(iscsi));
        return -1;
    }
    memset(acb->task, 0, sizeof(struct scsi_task));

    acb->task->xfer_dir = SCSI_XFER_READ;
    lba = sector_qemu2lun(acb->sector_num, acb->iscsilun);
    acb->task->expxferlen = acb->read_size;

    switch (acb->iscsilun->type) {
    case TYPE_DISK:
        acb->task->cdb_size = 16;
        acb->task->cdb[0]  = 0x88;
        *(uint32_t *)&acb->task->cdb[2]  = htonl(lba >> 32);
        *(uint32_t *)&acb->task->cdb[6]  = htonl(lba & 0xffffffff);
        *(uint32_t *)&acb->task->cdb[10] = htonl(num_sectors);
        break;
    default:
        acb->task->cdb_size = 10;
        acb->task->cdb[0]  = 0x28;
        *(uint32_t *)&acb->task->cdb[2] = htonl(lba);
        *(uint16_t *)&acb->task->cdb[7] = htons(num_sectors);
        break;
    }

    ret = iscsi_scsi_command_async(iscsi, acb->iscsilun->lun, acb->task,
                                   iscsi_aio_read16_cb,
                                   NULL,
                                   acb);
    if (ret != 0) {
        return -1;
    }

#if defined(LIBISCSI_FEATURE_IOVECTOR)
    scsi_task_set_iov_in(acb->task, (struct scsi_iovec*) acb->qiov->iov, acb->qiov->niov);
#else
    for (i = 0; i < acb->qiov->niov; i++) {
        scsi_task_add_data_in_buffer(acb->task,
                acb->qiov->iov[i].iov_len,
                acb->qiov->iov[i].iov_base);
    }
#endif
    return 0;
}
示例#14
0
/*
 * Execute a SCSI request synchronously
 */
void iSCSILibWrapper::iSCSIExecSCSISync(SCSIRequest &request, unsigned int lun)
{
    // Remove us from the background thread
    iSCSIBackGround::GetInstance().RemoveConnection(*this);

    struct iscsi_data data;
    struct scsi_task *task = request.GetTask();

    if (!mClient.connected || mClient.error)
    {
        if (mClient.error)
            mErrorString.Format("%s: previous error prevents executing SCSI request on target %s: %s",
                               __func__,
                               mTarget.c_str(),
                               iscsi_get_error(mIscsi));
        else
            mErrorString.Format("%s: Executing request on target %s not possible without a connection!",
                               __func__,
                               mTarget.c_str());
        mError = true;
        throw CException(mErrorString);
    }

    // You cannot re-execute a request unless you reset it
    if (request.IsExecuted())
    {
        EString estr;
        estr.Format("%s: SCSI Request already executed!", __func__);
        mError = true;
        throw CException(estr);
    }

    if (!task)  // Throw an exception
    {
        EString estr;
        estr.Format("%s: SCSIRequest does not have a task defined", __func__);
        mError = true;
        throw CException(estr);
    }

    switch (task->xfer_dir)
    {
        default:
        case SCSI_XFER_NONE:
            data.data = NULL;
            data.size = 0;
            break;

        case SCSI_XFER_READ:
            data.data = (unsigned char *)request.GetInBuffer().get();
            data.size = request.GetInBufferSize();
            break;

        case SCSI_XFER_WRITE:
            data.data = (unsigned char *)request.GetOutBuffer().get();
            data.size = request.GetOutBufferSize();
            break;
    }

    task-> expxferlen = data.size;

    mClient.finished = 0;

    if (iscsi_scsi_command_async(mIscsi, 
                                 lun, 
                                 task,
                                 exec_cb, 
                                 &data,
                                 this))
    {
        EString estr;
        estr.Format("%s: Error executing SCSI request: %s", __func__,
                    iscsi_get_error(mIscsi));
        mError = true;
        throw CException(mErrorString);
    }

    ServiceISCSIEvents();

    // Add to the background task
    iSCSIBackGround::GetInstance().AddConnection(*this);

    /*
     * Now, transfer any data back ... this might have to change if Ronnie
     * adds support for it in the library ...
     */

    switch (task->xfer_dir)
    {
    case SCSI_XFER_READ:
        memcpy(request.GetInBuffer().get(),
               task->datain.data, 
               std::min(request.GetInBufferSize(), 
                        (unsigned int)task->datain.size));
        break;
    default:
        break;
    }

    request.SetExecuted();
}