linux-ext4 - Re: Updated fsx.c program (fixed fallocate)

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Date:	Fri, 02 Oct 2009 16:26:05 -0700
From:	Mingming <cmm@...ibm.com>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	Andreas Dilger <adilger@....com>, linux-ext4@...r.kernel.org,
	Eric Sandeen <esandeen@...hat.com>,
	Subrata Modak <subrata@...ux.vnet.ibm.com>,
	Dave Jones <davej@...hat.com>, linux-fsdevel@...r.kernel.org
Subject: Re: Updated fsx.c program (fixed fallocate)

On Fri, 2009-10-02 at 17:40 -0500, Eric Sandeen wrote:
> Mingming wrote:
> > On Tue, 2009-09-29 at 16:39 -0600, Andreas Dilger wrote:
> >> I've done some work to merge some of the existing fsx.c mods into a
> >> single version.  Over & above the version that is in the LTP, I've
> >> included AKPM's O_DIRECT fixes (with a twist), the BSD mmap page and
> >> segfault handling, and per-write fsync.
> >>
> >> The twist for the O_DIRECT feature is that it will randomly open file
> >> descriptors with O_DIRECT, and if you use the Lustre-inspired multi-fd
> >> support (by specifying multiple pathnames for the output file) fsx will
> >> be testing buffered and O_DIRECT and mmap IO on the same file.
> >>
> >> Updated patch to have proper fallocate() handling in case glibc doesn't
> >> have this, for non-x86 architectures from MingMing Cao, based on code
> >> used by DB2.
> >>
> >> Signed-off-by: Andreas Dilger <adilger@....com>
> > 
> > On top of this, a little update to add O_DIRECT define.
> > 
> > Signed-off-by: Mingming Cao <cmm@...ibm.com>
> > 
> > --- fsx.c.orig	2009-10-02 14:22:12.299565348 -0700
> > +++ fsx.c	2009-10-01 16:36:17.271593794 -0700
> > @@ -78,6 +78,10 @@
> >  
> >  #define	LOGSIZE	100000
> >  
> > +#ifndef O_DIRECT
> > +#define O_DIRECT        040000  /* direct disk access hint */
> > +#endif
> > +
> >  struct log_entry	oplog[LOGSIZE];	/* the log */
> >  int			logptr = 0;	/* current position in log */
> >  int			logcount = 0;	/* total ops */
> > 
> > 
> 
> I think that
> 
> #define _GNU_SOURCE
> 
> will pull in the glibc headers' definition rather than doing our own....
> 

Oh? that's sounds good...

I tried to replace above with 
#define _GNU_SOURCE	1

gcc complained O_DIRECT is still not defined. what did I missing?

Mingming
> -Eric
> --
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