Re: [Xen-devel] [PATCH RFC 12/12] xen-block: implementindirect descriptors

[Jan Beulich]

>>> On 04.03.13 at 21:44, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> wrote:
> <nods> 'op' sounds good. With a comment saying it can do all of the 
> BLKIF_OPS_..
> except the BLKIF_OP_INDIRECT one. Thought one could in theory chain
> it that way for fun.

In fact I'd like to exclude chaining as well as BLKIF_OP_DISCARD here.
The former should - if useful for anything - be controlled by a
separate feature flag, and the latter is plain pointless to indirect.
And I reckon the same would apply to BLKIF_OP_FLUSH_DISKCACHE
and BLKIF_OP_RESERVED_1 - i.e. it might be better to state that
indirection is only permitted for normal I/O (read/write) ops.

Jan

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