lightweight zosmf restfiles/ds option for faster minimal dataset list with attributes

Current X-IBM-Attributes options for the zosmf /restfiles/ds API enable retrieval of just the dataset names, dataset+volume, and a "base" option which returns all information consistent with ISPF 3.4.

The base option can easily cause timeouts if the number of datasets exceed ~30-40 -- if this occurs in a batch/async application, it can be adjusted for, but in an interactive environment such as VSCode/ZOpenEditor, the user experiences a failure to load a list of datasets.

Some of the attributes returned through the base option are not necessary for displaying a list of datasets for editing; only a few are used to decide whether it can be edited:

• online/offline

• available (not open/exclusive enqueued)

• nonvsam

• PS or PO

• record format (V/F)

Information such as volume, create date, last reference date, allocation units and extents, %age space used are not necessary.

The largest overhead, besides reading and formatting all the DSCB information appears to be associated with the RACF open/read checking. Equivalent DSCB information can be retrieved by LISTDS and ISPF 3.4 without trying to open every dataset -- can zosmf dslist support an option with skips that step per dataset?

Perform a LISTDS or ISPF 3.4 against an HLQ which includes a subset of dsns which the user does not have read access to -- check system log for RACF ICH408I errors.

Perform same dslevel search with zosmf API (base information) and observe the ICH408I messages -- zosmf is attempting an alloc and possible open on each dsn