EADSCB: Specify the support level for extended attribute DSCBs

EADSCB=OK

This specification indicates that the calling program supports extended attribute DSCBs. An extended address volume may have these DSCBs allocated to it. The returned DSCBs (format-3, format-8) may contain extent descriptors described by 28-bit cylinder addresses or DSCBs (format-9) that contain additional attribute information.

For search calls where the data set name is passed (CVAFDIR ACCESS=READ,BFLEARG=0), a CVAFDIR request will fail if the EADSCB=OK indicator is not set and the DSCB associated with this data set name is a format-8 DSCB.

For seek calls where the record address is passed (CVAFDIR ACCESS=READ,BFLEARG=cchhr), a CVAFDIR request issued to an EAV volume will be failed if the EADSCB=OK indicator is not set and the DSCB associated with this address is a format-8 or format-9 DSCB.

For seek calls where the record address is passed (CVAFDIR ACCESS=READ,BFLEARG=cchhr), and MULTIPLEDSCBS=NO is specified or defaulted to NO, a CVAFDIR request will faileif the EADSCB=OK indicator is not set and the DSCB associated with this address is a format-3 DSCB that contain track addresses above 65,520 cylinders.

The failing error code for these cases will be reflected as follows:

CVAF status code (CVSTAT) set to STAT082.
Return code 4.

EADSCB=OK will set the CV4EADOK indicator in the CVPL.

For all other calls, the EADSCB=OK keyword is ignored.

EADSCB=NOTOK

Indicates a calling program does not support extended attribute DSCBs. The specification of this will resolve to the CV4EADOK indicator in the CVPL to be set off. This is the default.