> /*
> + * run the pre-io callback function if it exists. If this function
> + * fails it will mark the buffer with an error and the IO should
> + * not be dispatched.
> + */
> + if (bp->b_pre_io) {
> + bp->b_pre_io(bp);
> + if (bp->b_error) {
Wouldn't it be a cleaner calling convention to return the erro from the
callback?
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