Volume notification (Eioption 20)

During physical data set restore operations, this exit is called to provide information about the data set being allocated. This information includes:

Cluster/data set name (for RENAME and RENAMEUNCONDITIONAL keywords, the new data set name is presented)
An indication of whether the data set is VSAM or non-VSAM
Number of data and index components (VSAM only)
For each component or data set:
- The number of volumes it resides on
- The volume serial number of each volume
- An RBA token for each volume.

EIRECPTR points to EIREC20. EI20DA@ and EI20IX@ point to EI20DSI.

Note: SMS-managed multivolume non-VSAM data sets have an RBA token only for the first volume. Non-SMS-managed data sets never have an RBA token.

The valid return codes are:

0: Continue normal processing
20: Disconnect exit
32: End function. This return code is only valid for full or physical data set dump and full or physical data set restore operations