Alan Stern <[email protected]> wrote:
> > Alternatively the SG_GET_RESERVED_SIZE ioctl could be
> > modified to yield no more than max_sectors*512 .
>
> There should be one single ioctl which can be applied uniformly to all
> CD-type devices (in fact, to all devices using a request_queue) to learn
> max_sectors. This rules out using SG_GET_RESERVED_SIZE.
This has nothing to do with CD-type devices!
It is related to SCSI tansport.
> Furthermore, if you changed SG_GET_RESERVED_SIZE in this way you would
> only increase the confusion. The reserved size isn't directly related to
> the maximum allowed DMA length, and there's no point pretending it is.
> What if it turns out that the reserved size is smaller than max_sectors?
> Then you'd force user programs to do I/O in chunks that were smaller than
> necessary.
It would not increase confusion but reduce confusion because all
programs would later behave correctly without the need to change them.
Jörg
--
EMail:[email protected] (home) Jörg Schilling D-13353 Berlin
[email protected] (uni)
[email protected] (work) Blog: http://schily.blogspot.com/
URL: http://cdrecord.berlios.de/old/private/ ftp://ftp.berlios.de/pub/schily
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