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

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Message-Id: <1254523031.4095.208.camel@mingming-laptop>
Date:	Fri, 02 Oct 2009 15:37:11 -0700
From:	Mingming <cmm@...ibm.com>
To:	Andreas Dilger <adilger@....com>
Cc:	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 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 */


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