Am 20.06.2013 um 20:20 hat Peter Lieven geschrieben:
> Signed-off-by: Peter Lieven <[email protected]>
> ---
> block/iscsi.c | 57
> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 57 insertions(+)
>
> diff --git a/block/iscsi.c b/block/iscsi.c
> index 0bbf0b1..e6b966d 100644
> --- a/block/iscsi.c
> +++ b/block/iscsi.c
> @@ -49,6 +49,7 @@ typedef struct IscsiLun {
> uint64_t num_blocks;
> int events;
> QEMUTimer *nop_timer;
> + uint8_t lbpme;
> } IscsiLun;
>
> typedef struct IscsiAIOCB {
> @@ -800,6 +801,60 @@ iscsi_getlength(BlockDriverState *bs)
> return len;
> }
>
> +static int coroutine_fn iscsi_co_is_allocated(BlockDriverState *bs,
> + int64_t sector_num,
> + int nb_sectors, int *pnum)
> +{
> + IscsiLun *iscsilun = bs->opaque;
> + struct scsi_task *task = NULL;
> + struct scsi_get_lba_status *lbas = NULL;
> + struct scsi_lba_status_descriptor *lbasd = NULL;
> + int ret;
> +
> + *pnum = nb_sectors;
> +
> + if (iscsilun->lbpme == 0) {
> + return 1;
> + }
> +
> + /* in-flight requests could invalidate the lba status result */
> + while (iscsi_process_flush(iscsilun)) {
> + qemu_aio_wait();
> + }
Note that you're blocking here. The preferred way would be something
involving a yield from the coroutine and a reenter as soon as all
requests are done. Maybe a CoRwLock does what you need?
> +
> + task = iscsi_get_lba_status_sync(iscsilun->iscsi, iscsilun->lun,
> + sector_qemu2lun(sector_num, iscsilun),
> + 8+16);
Spacing around operators (8 + 16)
> +
> + if (task == NULL || task->status != SCSI_STATUS_GOOD) {
> + scsi_free_scsi_task(task);
> + return 1;
Error cases should set *pnum = 0 and return 0.
Kevin
