From: Dave Chinner <david@fromorbit.com>
To: Andreas Dilger <adilger@dilger.ca>
Cc: Allison Henderson <achender@linux.vnet.ibm.com>,
linux-ext4@vger.kernel.org
Subject: Re: [Ext4 punch hole 1/5] Ext4 Punch Hole Support: Convert Blocks to Uninit Exts
Date: Thu, 3 Mar 2011 07:23:13 +1100 [thread overview]
Message-ID: <20110302202313.GA15097@dastard> (raw)
In-Reply-To: <02A57041-5FC1-419D-89D2-47D541616DD4@dilger.ca>
On Mon, Feb 28, 2011 at 11:42:48PM -0700, Andreas Dilger wrote:
> On 2011-02-28, at 8:08 PM, Allison Henderson wrote:
> > This first patch adds a function to convert a range of blocks
> > to an uninitialized extent. This function will
> > be used to first convert the blocks to extents before
> > punching them out.
>
> This was proposed as a separate function for FALLOCATE by Dave
> Chinner (based on XFS_IOC_ZERO_RANGE), so this is useful as a
> standalone function.
XFS_IOC_ZERO_RANGE converts a range to unwritten extents, not
uninitialised extents. An uninitialised extent is one that is
allocated but had not data written to it (i.e. contains stale data),
while an unwritten/preallocated extent is guaranteed to contain
zeros. This may be just a terminology issue, but we should try to
use the same jargon across all filesystems...
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
next prev parent reply other threads:[~2011-03-02 20:23 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-01 3:08 [Ext4 punch hole 1/5] Ext4 Punch Hole Support: Convert Blocks to Uninit Exts Allison Henderson
2011-03-01 5:42 ` Dave Young
2011-03-01 5:51 ` Allison Henderson
2011-03-01 6:42 ` Andreas Dilger
2011-03-01 20:47 ` Allison Henderson
2011-03-01 23:16 ` Mingming Cao
2011-03-02 20:23 ` Dave Chinner [this message]
2011-03-03 0:56 ` Andreas Dilger
2011-03-03 14:27 ` Theodore Tso
2011-03-01 9:30 ` Amir Goldstein
2011-03-01 20:48 ` Allison Henderson
2011-03-02 1:32 ` Mingming Cao
2011-03-02 7:54 ` Amir Goldstein
2011-03-01 11:09 ` Yongqiang Yang
2011-03-02 3:32 ` Yongqiang Yang
2011-03-01 12:25 ` Yongqiang Yang
2011-03-01 20:52 ` Allison Henderson
2011-03-01 13:22 ` Yongqiang Yang
2011-03-10 5:40 ` Dave Young
-- strict thread matches above, loose matches on Subject: below --
2011-03-15 21:17 Allison Henderson
2011-03-15 21:41 Allison Henderson
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