linux-ext4 - Re: [XFS Tests Punch Hole 2/3 v3] XFS TESTS: Add Fallocate Punch Hole Test Routines

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 18 May 2011 18:41:51 -0700
From:	Joel Becker <jlbec@...lplan.org>
To:	Dave Chinner <david@...morbit.com>
Cc:	Allison Henderson <achender@...ux.vnet.ibm.com>,
	xfs-oss <xfs@....sgi.com>,
	Ext4 Developers List <linux-ext4@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Eric Sandeen <sandeen@...hat.com>
Subject: Re: [XFS Tests Punch Hole 2/3 v3] XFS TESTS: Add Fallocate Punch
 Hole Test Routines

On Thu, May 19, 2011 at 11:31:44AM +1000, Dave Chinner wrote:
> > +#
> > +# This test is successful when the following conditions are met:
> > +#  - ls shows that the number of blocks occupied by the file
> > +#    has decreased by the number of blocks punched out.
> 
> There's no guarantee that a filesystem will punch the number of
> blocks you expect.

	Cluster allocated filesystems like ocfs2 are certainly going to
punch some multiple of clusters, not exact blocks.  Eg if the hole is
punched in the middle of a cluster.

Joel

-- 

Life's Little Instruction Book #464

	"Don't miss the magic of the moment by focusing on what's
	 to come."

			http://www.jlbec.org/
			jlbec@...lplan.org
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html