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SubjectRe: [ANNOUNCE] Generic SCSI Target Middle Level for Linux (SCST) with target drivers
Christoph Hellwig wrote:
> On Wed, Jun 16, 2004 at 08:31:22PM +0400, Vladislav Bolkhovitin wrote:
> The code looks pretty neat to me, there's a few issues I'd like to see
> addresses but that doesn't make sense before the 2.4 support is dropped
> and there's an actual LLDD for 2.6. But I think for most interesting
> scenarios in the storage virtualization world your driver is pretty much
> useless because it wants to dispatch directly to a scsi device and doesn't
> go through the block layer. So no fancy volume managers/etc there to make
> interesting storage virtualization boxes.
For that is intended upcoming block device handler with block
layer/cache support,
which will be in its exec() method check, if requested blocks in cache,
and, if not, dispatch the commands to block layer, leaving regular
scsi_do_req() calls for tapes, changers, etc. In the similar way "_perf"
handlers work (they don't send READ/WRITE commands to SCSI devices for
performance studies).

This device handler is on our todo list. Actually, it's quite simple and
if anyone interested, he's help would be greatly appreciated.


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