Re: [] Kernel coredump to a pipe is failing

From: Andrew Morton
Date: Tue May 26 2009 - 19:29:24 EST

On Wed, 27 May 2009 01:14:28 +0200
Andi Kleen <andi@xxxxxxxxxxxxxx> wrote:

> On Tue, May 26, 2009 at 04:00:17PM -0700, Andrew Morton wrote:
> > dump_write() doesn't seem right, either. If ->write() returns, say,
> > 100 then the dump should keep on going. At present it treats this
> > return as an error.
> I think that's correct actually. Short write typically means serious
> issue like disk full or broken pipe, so stopping is good.

But we shouldn't assume that. It could be that the ->write
implementation is perfectly able to absorb the remaining data.

We should only error out of the write() returned zero or -EFOO.
The current code is simply buggy, but got lucky.

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