Re: [Xen-devel] [PATCH v3 04/12] xenstore: add per-node generation counter

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Fri, Nov 11, 2016 at 09:00:02AM +0100, Juergen Gross wrote:
> In order to be able to support reading the list of a node's children in
> multiple chunks (needed for list sizes > 4096 bytes) without having to
> allocate a temporary buffer we need some kind of generation counter for
> each node. This will help to recognize a node has changed between
> reading two chunks.
> 
> As removing a node and reintroducing it must result in different
> generation counts each generation value has to be globally unique. This
> can be ensured only by using a global 64 bit counter.
> 
> For handling of transactions there is already such a counter available,
> it just has to be expanded to 64 bits and must be stored in each
> modified node.
> 
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>

Reviewed-by: Wei Liu <wei.liu2@xxxxxxxxxx>

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