From: Ulrich Drepper <drepper@redhat.com>
Subject: Re: [RFC] Heads up on sys_fallocate()
Date: Mon, 05 Mar 2007 07:08:03 -0800
Message-ID: <45EC3253.2030206@redhat.com>
References: <20070117094658.GA17390@amitarora.in.ibm.com> <45EB4A55.3060908@redhat.com> <20070305001621.GB18691@lazybastard.org> <200703050136.37181.arnd@arndb.de> <20070305114109.GA454@lazybastard.org>
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Cc: Arnd Bergmann <arnd@arndb.de>,
	Christoph Hellwig <hch@infradead.org>,
	Dave Kleikamp <shaggy@linux.vnet.ibm.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	"Amit K. Arora" <aarora@linux.vnet.ibm.com>,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-ext4@vger.kernel.org, suparna@in.ibm.com, cmm@us.ibm.com,
	alex@clusterfs.com, suzuki@in.ibm.com
To: =?UTF-8?B?SsO2cm4gRW5nZWw=?= <joern@lazybastard.org>
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J=C3=B6rn Engel wrote:
> Does the allocation have to be persistent beyond lifetime of the file
> descriptor?

Of course.  You call posix_fallocate once for the lifetime of the file
when it is created to ensure that all future uses will work.

It seems your filesystem will not be able to support this unless
compression is turned off.

--=20
=E2=9E=A7 Ulrich Drepper =E2=9E=A7 Red Hat, Inc. =E2=9E=A7 444 Castro St =
=E2=9E=A7 Mountain View, CA =E2=9D=96


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