linux-kernel - Re: [PATCH 02/20] ceph: on-wire types

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Date:	Thu, 16 Jul 2009 09:58:32 -0700 (PDT)
From:	Sage Weil <sage@...dream.net>
To:	Andi Kleen <andi@...stfloor.org>
cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 02/20] ceph: on-wire types

On Thu, 16 Jul 2009, Andi Kleen wrote:
> Sage Weil <sage@...dream.net> writes:
> > +
> > +/*
> > + * Max file size is a policy choice; in reality we are limited
> > + * by 2^64.
> > + */
> > +#define CEPH_FILE_MAX_SIZE (1ULL << 40)   /* 1 TB */
> 
> Seems odd to hardcode this here.

It is.  It's just an arbitrary value to bound recovery time... I'll switch 
it a server-specified value.

> The way attribute packed is used in these files seems rather
> random and adhoc, sometimes it is, sometimes it isn't.

Not intentionally, it looks like it was missing on some structs 
that were already naturally aligned.  I'll add it everywhere.

> I assume you tested that 32bit and 64bit interoperability?

Yes.

> Is the file system supposed to be endian safe on the wire?

Yes, although I don't have access to any big endian machines, so it hasn't 
been tested.  We've been periodically running the code through sparse, 
though.

Thanks!
sage
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