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

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Date:	Fri, 02 Oct 2009 17:40:12 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	Mingming <cmm@...ibm.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)

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....

-Eric
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