linux-ext4 - Re: Ext4 Punch Hole Support: Change summary and test case summary

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Message-ID: <1303235373.2534.8.camel@mingming-laptop>
Date:	Tue, 19 Apr 2011 10:49:33 -0700
From:	Mingming Cao <cmm@...ibm.com>
To:	Andreas Dilger <adilger@...ger.ca>
Cc:	Allison Henderson <achender@...ux.vnet.ibm.com>,
	Ext4 Developers List <linux-ext4@...r.kernel.org>
Subject: Re: Ext4 Punch Hole Support: Change summary and test case summary

On Tue, 2011-04-19 at 02:29 -0600, Andreas Dilger wrote:
> On 2011-04-19, at 1:37 AM, Allison Henderson wrote:
> > .Big Hole Test
> > ---------------------------------------------------------------
> > A hole large hole is punched in a large file (exact file size=638169088 bytes, exact hole size = 638150422 bytes, offset = 6144 bytes), 
> > resulting in all but 5 blocks being punched out (2 in the front, 3 in the back).  This test case verifies that the code can properly
> > punch out a hole covering multiple extents.
> > 
> > This test is successful when the following conditions are met:
> > - File frag shows extents only for the first two blocks and the last 3 blocks
> > - The test file contains zeros from bytes 6144 to 638156566
> > (* ls and df is not measured here because some blocks will still be reserved
> > as index blocks causing the consumed space to be appear larger)
> 
> Shouldn't the remaining two extents fit inside the inode, so there is no need for index blocks, or does the extent removal code not shrink the index blocks?
> 

It seems so, the extent removal code today not shrink the index blocks 
> Cheers, Andreas
> 
> 
> 
> 
> 
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