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Subject: Re: Sparse files in Cygwin
To: cygwin AT cygwin DOT com
References: <BN3PR09MB034051C075124631B6D76ADAA5B90 AT BN3PR09MB0340 DOT namprd09 DOT prod DOT outlook DOT com>
From: Eric Blake <eblake AT redhat DOT com>
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Date: Wed, 26 Jul 2017 12:06:29 -0500
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From: Eric Blake <eblake AT redhat DOT com>
To: cygwin AT cygwin DOT com
Message-ID: <b7812609-95e6-f508-d80b-ded081e78413 AT redhat DOT com>
Subject: Re: Sparse files in Cygwin
References: <BN3PR09MB034051C075124631B6D76ADAA5B90 AT BN3PR09MB0340 DOT namprd09 DOT prod DOT outlook DOT com>
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On 07/26/2017 12:02 PM, Lavrentiev, Anton (NIH/NLM/NCBI) [C] wrote:
> Hello,
>=20
> I have a question whether sparse files are supported in Cygwin.  From the=
 source code,
> it looks like they are, but from the series of the following commands, I =
can't confirm:

They are, but only if you specifically update your mount options to ask
for them:

https://cygwin.com/cygwin-ug-net/using.html#mount-table

  sparse    - Switch on support for sparse files.  This option only makes
              sense on NTFS and then only if you really need sparse files.
	      Cygwin does not try to create sparse files by default for
	      performance reasons.

--=20
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org


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