From: Wang Sheng-Hui <shhuiw@gmail.com>
To: "Lukáš Czerner" <lczerner@redhat.com>
Cc: Allison Henderson <achender@linux.vnet.ibm.com>,
Theodore Ts'o <tytso@mit.edu>,
linux-ext4@vger.kernel.org
Subject: Re: Question about extents.c/ext4_ext_punch_hole
Date: Mon, 16 Jul 2012 16:04:54 +0800 [thread overview]
Message-ID: <5003CB26.9040401@gmail.com> (raw)
In-Reply-To: <alpine.LFD.2.00.1207160829280.3857@dhcp-1-248.brq.redhat.com>
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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prev parent reply other threads:[~2012-07-16 8:05 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-15 13:03 Question about extents.c/ext4_ext_punch_hole Wang Sheng-Hui
2012-07-16 6:36 ` Lukáš Czerner
2012-07-16 8:04 ` Wang Sheng-Hui [this message]
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