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Re: Fwd: Re: cp command - problem with sparse
- From: Christopher Faylor <cgf-no-personal-reply-please at cygwin dot com>
- To: cygwin at cygwin dot com
- Date: Tue, 1 Feb 2005 09:59:50 -0500
- Subject: Re: Fwd: Re: cp command - problem with sparse
- References: <41FF88C8.5060604@byu.net>
- Reply-to: cygwin at cygwin dot com
On Tue, Feb 01, 2005 at 06:48:56AM -0700, Eric Blake wrote:
>This question came up on the coreutils list:
>
>Does cygwin provide any support for sparse files on NTFS volumes that
>support it? lseek() could be patched to use FSCTL_SET_ZERO_DATA when a
>seek jumps past the end of a file open for writing, but there is still the
>issue of when that file is given the FSCTL_SET_SPARSE attribute.
Yes.
% fgrep FSCTL_SET_SPARSE *.cc
fhandler.cc: BOOL r = DeviceIoControl (h, FSCTL_SET_SPARSE, NULL, 0, NULL,
fhandler.cc: syscall_printf ("%d = DeviceIoControl(%p, FSCTL_SET_SPARSE, "
There are limitations on when a file is considered sparse, however. The archives
probably have more details.
cgf
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