Re: [PATCH RESEND] coredump: Ensure proper size of sparse core files

[David Miller]

From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Mon, 16 Jan 2017 23:55:21 -0800

> On Mon, Jan 16, 2017 at 10:42:43PM -0500, David Miller wrote:
>> The lseek() done by dump_skip() should extend the file properly.
> 
> lseek never extends a file.  It just moves the current file position.
> So if you do not have a write after the lseek it does nothing.

Ok, then the only other feedback I have is that we should probably
defer this truncate() call until the last possible dump write occurs
rather than right after the VMA loop.