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softmmu/physmem: Bail out early in ram_block_discard_range() with rea…
…donly files fallocate() will fail, let's print a nicer error message. Message-ID: <20230906120503.359863-6-david@redhat.com> Suggested-by: Peter Xu <peterx@redhat.com> Reviewed-by: Peter Xu <peterx@redhat.com> Signed-off-by: David Hildenbrand <david@redhat.com>
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