[RESEND] block/iscsi: query for supported VPD pages

this patch ensures that we only query for block provisioning and
block limits vpd pages if they are advertised. It also cleans
up the inquiry code and eliminates some redundant code.

Signed-off-by: Peter Lieven <pl@kamp.de>
---
 block/iscsi.c |  107 +++++++++++++++++++++++++++++----------------------------
 1 file changed, 54 insertions(+), 53 deletions(-)

Il 17/02/2014 18:34, Peter Lieven ha scritto:
> this patch ensures that we only query for block provisioning and
> block limits vpd pages if they are advertised. It also cleans
> up the inquiry code and eliminates some redundant code.
>
> Signed-off-by: Peter Lieven <pl@kamp.de>

Thanks, I've queued it.  It conflicts with my bdrv_open error series, 
but I'll handle the rebase.

Paolo

> ---
>  block/iscsi.c |  107 +++++++++++++++++++++++++++++----------------------------
>  1 file changed, 54 insertions(+), 53 deletions(-)
>
> diff --git a/block/iscsi.c b/block/iscsi.c
> index 6f4af72..38b07f8 100644
> --- a/block/iscsi.c
> +++ b/block/iscsi.c
> @@ -1066,7 +1066,8 @@ static QemuOptsList runtime_opts = {
>  };
>
>  static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi,
> -                                          int lun, int evpd, int pc) {
> +                                          int lun, int evpd, int pc,
> +                                          void **inq) {
>          int full_size;
>          struct scsi_task *task = NULL;
>          task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, 64);
> @@ -1084,14 +1085,18 @@ static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi,
>              }
>          }
>
> +        *inq = scsi_datain_unmarshall(task);
> +        if (*inq == NULL) {
> +            goto fail;
> +        }
> +
>          return task;
>
>  fail:
>          error_report("iSCSI: Inquiry command failed : %s",
>                       iscsi_get_error(iscsi));
> -        if (task) {
> +        if (task != NULL) {
>              scsi_free_scsi_task(task);
> -            return NULL;
>          }
>          return NULL;
>  }
> @@ -1108,11 +1113,12 @@ static int iscsi_open(BlockDriverState *bs, QDict *options, int flags,
>      struct iscsi_url *iscsi_url = NULL;
>      struct scsi_task *task = NULL;
>      struct scsi_inquiry_standard *inq = NULL;
> +    struct scsi_inquiry_supported_pages *inq_vpd;
>      char *initiator_name = NULL;
>      QemuOpts *opts;
>      Error *local_err = NULL;
>      const char *filename;
> -    int ret;
> +    int i, ret;
>
>      if ((BDRV_SECTOR_SIZE % 512) != 0) {
>          error_report("iSCSI: Invalid BDRV_SECTOR_SIZE. "
> @@ -1132,7 +1138,6 @@ static int iscsi_open(BlockDriverState *bs, QDict *options, int flags,
>
>      filename = qemu_opt_get(opts, "filename");
>
> -
>      iscsi_url = iscsi_parse_full_url(iscsi, filename);
>      if (iscsi_url == NULL) {
>          error_report("Failed to parse URL : %s", filename);
> @@ -1194,24 +1199,17 @@ static int iscsi_open(BlockDriverState *bs, QDict *options, int flags,
>
>      iscsilun->iscsi = iscsi;
>      iscsilun->lun   = iscsi_url->lun;
> +    iscsilun->has_write_same = true;
>
> -    task = iscsi_inquiry_sync(iscsi, iscsilun->lun, 0, 0, 36);
> -
> -    if (task == NULL || task->status != SCSI_STATUS_GOOD) {
> -        error_report("iSCSI: failed to send inquiry command.");
> -        ret = -EINVAL;
> -        goto out;
> -    }
> -
> -    inq = scsi_datain_unmarshall(task);
> -    if (inq == NULL) {
> -        error_report("iSCSI: Failed to unmarshall inquiry data.");
> +    task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 0, 0,
> +                            (void **) &inq);
> +    if (task == NULL) {
>          ret = -EINVAL;
>          goto out;
>      }
> -
>      iscsilun->type = inq->periperal_device_type;
> -    iscsilun->has_write_same = true;
> +    scsi_free_scsi_task(task);
> +    task = NULL;
>
>      if ((ret = iscsi_readcapacity_sync(iscsilun)) != 0) {
>          goto out;
> @@ -1228,45 +1226,48 @@ 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;
> +    task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
> +                            SCSI_INQUIRY_PAGECODE_SUPPORTED_VPD_PAGES,
> +                            (void **) &inq_vpd);
> +    if (task == NULL) {
> +        ret = -EINVAL;
> +        goto out;
>      }
> -
> -    if (iscsilun->lbp.lbpu || iscsilun->lbp.lbpws) {
> +    for (i = 0; i < inq_vpd->num_pages; i++) {
> +        struct scsi_task *inq_task;
> +        struct scsi_inquiry_logical_block_provisioning *inq_lbp;
>          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;
> +        switch (inq_vpd->pages[i]) {
> +        case SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING:
> +            inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
> +                                        SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING,
> +                                        (void **) &inq_lbp);
> +            if (inq_task == NULL) {
> +                ret = -EINVAL;
> +                goto out;
> +            }
> +            memcpy(&iscsilun->lbp, inq_lbp,
> +                   sizeof(struct scsi_inquiry_logical_block_provisioning));
> +            scsi_free_scsi_task(inq_task);
> +            break;
> +        case SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS:
> +            inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
> +                                    SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS,
> +                                    (void **) &inq_bl);
> +            if (inq_task == NULL) {
> +                ret = -EINVAL;
> +                goto out;
> +            }
> +            memcpy(&iscsilun->bl, inq_bl,
> +                   sizeof(struct scsi_inquiry_block_limits));
> +            scsi_free_scsi_task(inq_task);
> +            break;
> +        default:
> +            break;
>          }
> -        memcpy(&iscsilun->bl, inq_bl,
> -               sizeof(struct scsi_inquiry_block_limits));
> -        scsi_free_scsi_task(task);
> -        task = NULL;
>      }
> +    scsi_free_scsi_task(task);
> +    task = NULL;
>
>  #if defined(LIBISCSI_FEATURE_NOP_COUNTER)
>      /* Set up a timer for sending out iSCSI NOPs */
>