linux-kernel - Re: [PATCH 26/35] Unionfs: Privileged operations workqueue

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Date:	Fri, 8 Dec 2006 11:00:38 -0500
From:	Josef Sipek <jsipek@....cs.sunysb.edu>
To:	Jan Engelhardt <jengelh@...ux01.gwdg.de>
Cc:	"Josef 'Jeff' Sipek" <jsipek@...sunysb.edu>,
	linux-kernel@...r.kernel.org, torvalds@...l.org, akpm@...l.org,
	hch@...radead.org, viro@....linux.org.uk,
	linux-fsdevel@...r.kernel.org, mhalcrow@...ibm.com
Subject: Re: [PATCH 26/35] Unionfs: Privileged operations workqueue

On Fri, Dec 08, 2006 at 11:38:13AM +0100, Jan Engelhardt wrote:
> 
> On Dec 7 2006 21:17, Josef Sipek wrote:
> >> >> > >+void __unionfs_mknod(void *data)
> >> >> > >+{
> >> >> > >+	struct sioq_args *args = data;
> >> >> > >+	struct mknod_args *m = &args->mknod;
> 
> ...
> ||||| vfs_mknod(m->parent, m->dentry, m->mode, m->dev);
> 
> >> >If I make the *args = data line const, then gcc (4.1) yells about modifying
> >> >a const variable 3 lines down..
> >> >
> >> >args->err = vfs_mknod(m->parent, m->dentry, m->mode, m->dev);
> >> >
> >> >Sure, I could cast, but that seems like adding cruft for no good reason.
> >> 
> >> No I despise casts more than missing consts. Why would gcc throw a warning?
> >> Let's take this super simple program
> >
> >No, this program doesn't tickle the problem.. Try to compile this one:
> 
> The members of m (i.e. m->*) are not modified as for as __unionfs_mknod goes.
> vfs_mknod may only modify the members of m->parent (i.e. m->parent->*)
 
Yes they are. The return value is passed through a member of m.
 
Josef "Jeff" Sipek.

-- 
The box said "Windows XP or better required". So I installed Linux.
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