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Re: [Libguestfs] [PATCH nbdkit v3 1/3] filters: Implement next_ops .reopen call.



On 9/19/19 10:26 AM, Richard W.M. Jones wrote:
> This is intended for use by the forthcoming retry filter to close and
> reopen the backend chain.  It is handled entirely by server/backend.c
> as no cooperation is needed with the plugin.
> 
> Note the explicit readonly parameter: An alternative would be to store
> the previous readonly setting in the b_conn_handle struct.  However
> passing it explicitly allows the retry filter to retry as readonly,
> which might be useful.  This design does however require any filter
> which might call .reopen to save the original readonly parameter from
> the .open call.
> ---
>  include/nbdkit-filter.h |  6 ++++++
>  server/backend.c        | 12 ++++++++++++
>  server/filters.c        |  8 ++++++++
>  server/internal.h       |  4 ++++
>  4 files changed, 30 insertions(+)

docs/nbdkit-filter.pod should probably get an update as well.

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org

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