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From: Jamie Lokier <jamie@shareable.org>
To: Filip Navara <filip.navara@gmail.com>
Cc: Kevin Wolf <kwolf@redhat.com>, Avi Kivity <avi@redhat.com>,
	qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH] qcow2: Metadata preallocation
Date: Sun, 16 Aug 2009 17:48:42 +0100	[thread overview]
Message-ID: <20090816164841.GA27122@shareable.org> (raw)
In-Reply-To: <5b31733c0908160512r25abf0d2ld45a3602a8c540fa@mail.gmail.com>

Filip Navara wrote:
> FILE_ATTRIBUTE_SPARSE_FILE? You can't actually set it when
> opening/creating the file, a separate call to
> DeviceIoControl/FSCTL_SET_SPARSE is needed.

I see that you increase the file size by writing zeros to the end.

Can't you use the Windows equivalent of unix ftruncate() to extend the
file instead, after FSCTL_SET_SPARSE?

-- Jamie

  reply	other threads:[~2009-08-16 16:48 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-08-14 15:00 [Qemu-devel] [PATCH] qcow2: Metadata preallocation Kevin Wolf
2009-08-16 11:58 ` Avi Kivity
2009-08-16 12:12   ` Filip Navara
2009-08-16 16:48     ` Jamie Lokier [this message]
2009-08-16 20:28       ` Jamie Lokier
2009-08-17  7:16       ` Kevin Wolf
2009-08-17  7:11   ` Kevin Wolf
2009-08-17  7:45     ` Avi Kivity
2009-08-17  7:58       ` Kevin Wolf

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