Re: [Qemu-devel] [PATCH v2 09/13] block: Add a 'mutable_opts' field to BlockDriver

[Kevin Wolf]

Am 06.03.2019 um 19:11 hat Alberto Garcia geschrieben:
> If we reopen a BlockDriverState and there is an option that is present
> in bs->options but missing from the new set of options then we have to
> return an error unless the driver is able to reset it to its default
> value.
> 
> This patch adds a new 'mutable_opts' field to BlockDriver. This is
> a list of runtime options that can be modified during reopen. If an
> option in this list is unspecified on reopen then it must be reset (or
> return an error).
> 
> Signed-off-by: Alberto Garcia <address@hidden>
> ---
>  block/file-posix.c        |  6 ++++++
>  block/qcow2.c             | 25 +++++++++++++++++++++++++
>  block/raw-format.c        |  3 +++
>  include/block/block_int.h |  8 ++++++++
>  4 files changed, 42 insertions(+)

Two more drivers seem to be able to change options: gluster (debug and
logfile) and throttle (throttle-group).

Kevin