Davidlohr Bueso wrote: > On Tue, 29 Oct 2024, ira.weiny@xxxxxxxxx wrote: > > >Linux has no use for the trailing fields of the Get Dynamic Capacity > >Configuration Output Payload (Total number of supported extents, number > >of available extents, total number of supported tags, and number of > >available tags). Avoid defining those fields to use the more useful > >dynamic C array. > > More of a general question, if anyone knows: why does the spec define > the fields in that order, and not put the region config structure(s) > at the end, as with all other cmds, afaik. Because the 3.0 spec only left 7 bytes of reserved space before the region config structure array. One might argue that no one would ever implement the 3.0 spec for DCD but at the time it was seen as an unbreakable structure. While it is not impossible to utilize those fields they are not required right now. So in this implementation it was better to use the dynamic C array's and leave the use of those fields for another day. Ira
