linux-kernel - Re: [V3 PATCH 1/2] tmpfs: add fallocate support

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Message-ID: <CAHGf_=oD0Coc=k5kAAQoP=GqK+nc0jd3qq3TmLZaitSjH-ZPmQ@mail.gmail.com>
Date:	Wed, 23 Nov 2011 21:46:39 -0500
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Cong Wang <amwang@...hat.com>, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, Pekka Enberg <penberg@...nel.org>,
	Christoph Hellwig <hch@....de>,
	Hugh Dickins <hughd@...gle.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Lennart Poettering <lennart@...ttering.net>,
	Kay Sievers <kay.sievers@...y.org>, linux-mm@...ck.org
Subject: Re: [V3 PATCH 1/2] tmpfs: add fallocate support

>> +     while (index < end) {
>> +             ret = shmem_getpage(inode, index, &page, SGP_WRITE, NULL);
>
> If the 'page' for index exists before this call, this will return the page without
> allocaton.
>
> Then, the page may not be zero-cleared. I think the page should be zero-cleared.

No. fallocate shouldn't destroy existing data. It only ensure
subsequent file access don't make ENOSPC error.
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