Re: [PATCH 03/61] libfrog: create header file for mocked-up kernel data structures

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On Thu, Sep 16, 2021 at 10:46:46AM +1000, Dave Chinner wrote:
> On Wed, Sep 15, 2021 at 04:06:51PM -0700, Darrick J. Wong wrote:
> > From: Darrick J. Wong <djwong@xxxxxxxxxx>
> > 
> > Create a mockups.h for mocked-up versions of kernel data structures to
> > ease porting of libxfs code.
> > 
> > Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
> > ---
> >  include/libxfs.h     |    1 +
> >  libfrog/Makefile     |    1 +
> >  libfrog/mockups.h    |   19 +++++++++++++++++++
> >  libxfs/libxfs_priv.h |    4 +---
> >  4 files changed, 22 insertions(+), 3 deletions(-)
> 
> I don't really like moving this stuff to libfrog. The whole point of
> libxfs/libxfs_priv.h is to define the kernel wrapper stuff that
> libxfs needs to compile and should never be seen by anything outside
> libxfs/...

How did you handle this in your xfsprogs port?  I /think/ the only
reason we need the mockups is to handle the perag structure in xfs_ag.h?
In that case, I guess one could simply omit the stuff below the "kernel
only structures below this line" line?

In that case, can you (or anyone, really) fix libxfs-compare to be smart
enough to filter out the "#ifdef __KERNEL__" parts of libxfs from the
diff?

--D

> Indeed, we -cannot- use spinlocks in userspace code, so I really
> don't see why we'd want to make them more widely visible to the
> userspace xfsprogs code...
> 
> Cheers,
> 
> Dave.
> -- 
> Dave Chinner
> david@xxxxxxxxxxxxx



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