Re: [PATCH] xfs: check sizes of XFS on-disk structures at compile time

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On Sat, Jan 16, 2016 at 09:52:19AM +1100, Dave Chinner wrote:
> On Fri, Jan 15, 2016 at 12:58:01PM -0800, Darrick J. Wong wrote:
> > On Mon, Jan 11, 2016 at 03:26:57PM -0800, Darrick J. Wong wrote:
> > > Check the sizes of XFS on-disk structures when compiling the kernel.
> > > Use this to catch inadvertent changes in structure size due to padding
> > > and alignment issues, etc.
> > > 
> > > Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
> ....
> > > +	XFS_CHECK_STRUCT_SIZE(struct xfs_efi_log_format_64,	32);
> > > +	XFS_CHECK_STRUCT_SIZE(struct xfs_efd_log_format_32,	28);
> > > +	XFS_CHECK_STRUCT_SIZE(struct xfs_efd_log_format_64,	32);
> > > +	XFS_CHECK_STRUCT_SIZE(struct xfs_dq_logformat,		24);
> > > +	XFS_CHECK_STRUCT_SIZE(struct xfs_qoff_logformat,	20);
> > > +	XFS_CHECK_STRUCT_SIZE(struct xfs_icreate_log,		28);
> > > +}
> > 
> > Perhaps this huge function ought to hide away in its own file?
> 
> Yes, I think that's a good idea, and I think it should only be built
> on debug builds, too.

Doesn't this turn into nothingness as far as the generated binary is
concerned?  Because if it does, I don't see a reason to keep it debug-only.
Afterall, non-debug builds need to be correct and these are pretty important
checks.  We certainly don't want another ARM structure padding & alignment
fiasco.

Just my 2 cents,

Jeff.

-- 
Only two things are infinite, the universe and human stupidity, and I'm not
sure about the former.
		- Albert Einstein

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