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Calling 'handle_io_response()' in a regular VFS function (in contrast to a post-signal hook) can cause problems if the caller of the VFS function holds a lock which prevents the io response handler from returning. With this commit, the user of the VFS becomes responsible for unblocking threads which might be blocking after a failed 'queue_read()', 'queue_sync()' or 'write()' call. Fixes #2896