linux-kernel - Re: [RFC][PATCH 10/13] make dump_emit() use vfs_write() instead of banging at ->f

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Message-ID: <20131009012036.GF13318@ZenIV.linux.org.uk>
Date:	Wed, 9 Oct 2013 02:20:36 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Al Viro <viro@....linux.org.uk>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH 10/13] make dump_emit() use vfs_write() instead of
 banging at ->f_op->write directly

On Wed, Oct 09, 2013 at 02:18:33AM +0100, Al Viro wrote:

> Point, but I would argue that we should yell very loud if we get 0 from
> vfs_write() for non-zero size.  I'm not sure if POSIX allows write(2)
> to return that, but a lot of userland code won't be expecting that and
> won't be able to cope...

PS: I agree that we should abort that loop if we get nr == 0, of course,
but I believe that we should report the pathname of the offending file,
at the very least.
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