linux-ext4 - Re: Question about extents.c/ext4_ext_punch

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Message-ID: <5003CB26.9040401@gmail.com>
Date:	Mon, 16 Jul 2012 16:04:54 +0800
From:	Wang Sheng-Hui <shhuiw@...il.com>
To:	Lukáš Czerner <lczerner@...hat.com>
CC:	Allison Henderson <achender@...ux.vnet.ibm.com>,
	Theodore Ts'o <tytso@....edu>, linux-ext4@...r.kernel.org
Subject: Re: Question about extents.c/ext4_ext_punch_hole

On 2012年07月16日 14:36, Lukáš Czerner wrote:
> Indeed we're going to align
> the range to the block size, but that's because blocks in this range
> are going to be freed. Then, the rest of the range (non block
> aligned) is going to be zeroed manually. The reason is that we can
> not free those blocks, because it still contains valid data and we
> can not just leave it alone, since after the punch hole finishes
> we'll have to read zeroes from entire punched region.
> 

Got it. Thanks, Lukas!
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