Re: [Qemu-devel] [PATCHv4 1/2] iscsi: add logical block provisioning information to iscsilun

[Paolo Bonzini <pbonzini@redhat.com>]

Il 18/07/2013 10:19, Peter Lieven ha scritto:
> Signed-off-by: Peter Lieven <pl@kamp.de>
> ---
>  block/iscsi.c |   77 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 77 insertions(+)
> 
> diff --git a/block/iscsi.c b/block/iscsi.c
> index 0bbf0b1..ab42f1e 100644
> --- a/block/iscsi.c
> +++ b/block/iscsi.c
> @@ -49,6 +49,10 @@ typedef struct IscsiLun {
>      uint64_t num_blocks;
>      int events;
>      QEMUTimer *nop_timer;
> +    uint8_t lbpme;
> +    uint8_t lbprz;
> +    struct scsi_inquiry_logical_block_provisioning lbp;
> +    struct scsi_inquiry_block_limits bl;

Available since 1.3.0, looks good.

Acked-by: Paolo Bonzini <pbonzini@redhat.com>

>  } IscsiLun;
>  
>  typedef struct IscsiAIOCB {
> @@ -948,6 +952,8 @@ static int iscsi_readcapacity_sync(IscsiLun *iscsilun)
>                  } else {
>                      iscsilun->block_size = rc16->block_length;
>                      iscsilun->num_blocks = rc16->returned_lba + 1;
> +                    iscsilun->lbpme = rc16->lbpme;
> +                    iscsilun->lbprz = rc16->lbprz;
>                  }
>              }
>              break;
> @@ -1000,6 +1006,37 @@ static QemuOptsList runtime_opts = {
>      },
>  };
>  
> +static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi,
> +                                          int lun, int evpd, int pc) {
> +        int full_size;
> +        struct scsi_task *task = NULL;
> +        task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, 64);
> +        if (task == NULL || task->status != SCSI_STATUS_GOOD) {
> +            goto fail;
> +        }
> +        full_size = scsi_datain_getfullsize(task);
> +        if (full_size > task->datain.size) {
> +            scsi_free_scsi_task(task);
> +
> +            /* we need more data for the full list */
> +            task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, full_size);
> +            if (task == NULL || task->status != SCSI_STATUS_GOOD) {
> +                goto fail;
> +            }
> +        }
> +
> +        return task;
> +
> +fail:
> +        error_report("iSCSI: Inquiry command failed : %s",
> +                     iscsi_get_error(iscsi));
> +        if (task) {
> +            scsi_free_scsi_task(task);
> +            return NULL;
> +        }
> +        return NULL;
> +}
> +
>  /*
>   * We support iscsi url's on the form
>   * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun>
> @@ -1130,6 +1167,46 @@ static int iscsi_open(BlockDriverState *bs, QDict *options, int flags)
>          bs->sg = 1;
>      }
>  
> +    if (iscsilun->lbpme) {
> +        struct scsi_inquiry_logical_block_provisioning *inq_lbp;
> +        task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
> +                                SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING);
> +        if (task == NULL) {
> +            ret = -EINVAL;
> +            goto out;
> +        }
> +        inq_lbp = scsi_datain_unmarshall(task);
> +        if (inq_lbp == NULL) {
> +            error_report("iSCSI: failed to unmarshall inquiry datain blob");
> +            ret = -EINVAL;
> +            goto out;
> +        }
> +        memcpy(&iscsilun->lbp, inq_lbp,
> +               sizeof(struct scsi_inquiry_logical_block_provisioning));
> +        scsi_free_scsi_task(task);
> +        task = NULL;
> +    }
> +
> +    if (iscsilun->lbp.lbpu) {
> +        struct scsi_inquiry_block_limits *inq_bl;
> +        task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
> +                                SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS);
> +        if (task == NULL) {
> +            ret = -EINVAL;
> +            goto out;
> +        }
> +        inq_bl = scsi_datain_unmarshall(task);
> +        if (inq_bl == NULL) {
> +            error_report("iSCSI: failed to unmarshall inquiry datain blob");
> +            ret = -EINVAL;
> +            goto out;
> +        }
> +        memcpy(&iscsilun->bl, inq_bl,
> +               sizeof(struct scsi_inquiry_block_limits));
> +        scsi_free_scsi_task(task);
> +        task = NULL;
> +    }
> +
>  #if defined(LIBISCSI_FEATURE_NOP_COUNTER)
>      /* Set up a timer for sending out iSCSI NOPs */
>      iscsilun->nop_timer = qemu_new_timer_ms(rt_clock, iscsi_nop_timed_event, iscsilun);
>