Hi folks,

Several people tried to connect cdrecord and cdda2wav
with a pipe to avoid a copy on hard disk. One guy reported
cdrecord got buffer underruns then.

I had a look into the source and found the memory handling
in the generic SCSI driver to be the culprit. I changed this, so that
multiple requests could be done without blocking each other.
Please test the appended patch (against 2.1.112).
Instead of using one global memory  block, the patch changes
this to a lazy memory allocation scheme with block sizes of 32, 64, and
128K.

I have lightly tested this patch without problems. Please give any
feedback to this list.

Thanks,
Heiko(See attached file: sg_pat)

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