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

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Date:   Tue, 17 Jan 2017 15:01:07 -0600
From:   Dave Kleikamp <dave.kleikamp@...cle.com>
To:     David Miller <davem@...emloft.net>, hch@...radead.org
Cc:     viro@...iv.linux.org.uk, sparclinux@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND] coredump: Ensure proper size of sparse core files

On 01/17/2017 02:44 PM, David Miller wrote:
> From: Christoph Hellwig <hch@...radead.org>
> 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.

Yeah. That's fine with me.