linux-kernel - Re: [NFS] What's slated for inclusion in 2.6.24-rc1 from the NFS client git tree...

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Date:	Mon, 8 Oct 2007 18:36:16 +1000
From:	Greg Banks <gnb@....com>
To:	Jeff Layton <jlayton@...hat.com>
Cc:	Valdis.Kletnieks@...edu, Peter Staubach <staubach@...hat.com>,
	Andrew@...-sf-spam2-b.sourceforge.net, nfsv4@...ux-nfs.org,
	linux-kernel@...r.kernel.org,
	Trond Myklebust <trond.myklebust@....uio.no>,
	nfs@...ts.sourceforge.net, Pierre Ossman <drzeus-list@...eus.cx>,
	Morton <akpm@...ux-foundation.org>
Subject: Re: [NFS] What's slated for inclusion in 2.6.24-rc1 from the NFS client git tree...

On Fri, Oct 05, 2007 at 02:00:37PM -0400, Jeff Layton wrote:
> On Fri, 05 Oct 2007 13:30:10 -0400
> Valdis.Kletnieks@...edu wrote:
> >
> > How does Joe Sysadmin tell if he has an affected legacy app or not?
> > 
> > (The obvious "try it and see what breaks" is a non-starter for many places,
> > because you too easily end up in a loop of "enable it, find 4-5 show stoppers,
> > turn it off, fix them, lather rinse repease".  Been there, done that, got
> > the tshirt - a project I got dragged into involves a large storage array that
> > appears to insist on exporting 64-bit stuff, and a large farm of clients that
> > are very 64-bit unclean....)
> > 
> 
> In addition to Trond's suggestion, you might be able to use "nm" or
> something like it and see if there are references to non-LFS (f)stat
> calls in your binaries. For instance, if you see references to stat()
> (and not stat64()), then the app is probably not built with 64-bit file
> offsets.

Attached is a Perl script I wrote a while back to scan directories
looking for old stat calls in binaries.  Here's the output from
my laptop:

# ./summarise-stat64.pl /usr/bin
    775 26.8% are scripts (shell, perl, whatever)
   1404 48.5% don't use any stat() family calls at all
    428 14.8% use 32-bit stat() family interfaces only
    278  9.6% use 64-bit stat64() family interfaces only
     11  0.4% use both 32-bit and 64-bit stat() family interfaces

# ./summarise-stat64.pl /usr/sbin
    164 35.7% are scripts (shell, perl, whatever)
    170 37.0% don't use any stat() family calls at all
     78 17.0% use 32-bit stat() family interfaces only
     46 10.0% use 64-bit stat64() family interfaces only
      1  0.2% use both 32-bit and 64-bit stat() family interfaces

# ./summarise-stat64.pl -v /usr/bin
...
/usr/bin/vi use 32-bit stat() family interfaces only
/usr/bin/view use 32-bit stat() family interfaces only
/usr/bin/vim use 32-bit stat() family interfaces only
...
/usr/bin/Mail use 32-bit stat() family interfaces only
/usr/bin/mail use 32-bit stat() family interfaces only
/usr/bin/mailx use 32-bit stat() family interfaces only
...
/usr/bin/gdb use 32-bit stat() family interfaces only
/usr/bin/gdbtui use 32-bit stat() family interfaces only
/usr/bin/rpcgen use 32-bit stat() family interfaces only
...
/usr/bin/cc use 32-bit stat() family interfaces only
/usr/bin/gcc use 32-bit stat() family interfaces only
/usr/bin/gcov use 32-bit stat() family interfaces only
/usr/bin/unprotoize use 32-bit stat() family interfaces only
...
/usr/bin/git use 32-bit stat() family interfaces only
/usr/bin/git-check-ref-format use 32-bit stat() family interfaces only
/usr/bin/git-cat-file use 32-bit stat() family interfaces only
/usr/bin/git-checkout-index use 32-bit stat() family interfaces only
/usr/bin/git-clone-pack use 32-bit stat() family interfaces only
/usr/bin/git-commit-tree use 32-bit stat() family interfaces only
/usr/bin/git-convert-objects use 32-bit stat() family interfaces only
/usr/bin/git-daemon use 32-bit stat() family interfaces only
/usr/bin/git-describe use 32-bit stat() family interfaces only
...

Greg.
-- 
Greg Banks, R&D Software Engineer, SGI Australian Software Group.
Apparently, I'm Bedevere.  Which MPHG character are you?
I don't speak for SGI.

View attachment "summarise-stat64.pl" of type "text/plain" (3927 bytes)