Re: [00/17] Large Blocksize Support V3

From: Nick Piggin
Date: Fri Apr 27 2007 - 06:26:46 EST

Eric W. Biederman wrote:
Jens Axboe <jens.axboe@xxxxxxxxxx> writes:

Yes, that is exactly the problem. Once you have that, pktcdvd is pretty
much reduced to setup and init code, the actual data handling can be
done by sr or ide-cd directly. You could merge it into cdrom.c, it would
not be very different from mt-rainier handling (which basically does RMW
in firmware, so it works for any write, but performance is of course
horrible if you don't do it right).

Thanks for the clarification.

So we do have a clear problem that we do not have generic support for
large sector sizes residing in the page cache.

Well, it is a clear limitation. It hasn't mattered too much until
now, but it is one of the other issues that SGI hit (aside from
io efficiency) because they have 16K filesystems created on ia64
systems that I believe they want to access with x86-64 systems.

I'm slowly looking at patches in the background, but I'm hoping to
be able to spend a decent chunk of time working on them again soon.

It isn't trivial :)

SUSE Labs, Novell Inc.
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