linux-kernel - Re: 2.6.24-rc5-mm1 - wonky disk cache and CDROM behavior...

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Date:	Wed, 19 Dec 2007 09:33:50 +0800
From:	"Dave Young" <hidave.darkstar@...il.com>
To:	"David Howells" <dhowells@...hat.com>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	Valdis.Kletnieks@...edu, viro@...iv.linux.org.uk,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.24-rc5-mm1 - wonky disk cache and CDROM behavior...

On Dec 19, 2007 9:22 AM, David Howells <dhowells@...hat.com> wrote:
> Andrew Morton <akpm@...ux-foundation.org> wrote:
>
> > > -                   inode = ERR_PTR(ret);
> > > +                   return NULL;
> > >             } else {
> > >                     unlock_new_inode(inode);
> > >             }
> > >
> >
> > Yup.
>
> Nope.  The correct fix is to make the various callers use IS_ERR() to check
> the result of this function rather than checking for a NULL return.
>
> > David, this is concerning.  More such error-path bugs in that code will take
> > years and years to get found and fixed.
>
> Yes, I know.  I've looked over the patches several times, however I know there
> may be bugs in there because I may have made assumptions about what I've
> written that cause me to overlook things.  It's a danger of checking your own
> code:-(
>
> > The best way to eliminate them is a line-by-line re-review of the patchset.
>
> And ideally by someone other than me.  Some of them have been reviewed by
> other people, but I'm not sure that all have.
>
> However, I've just had another look through.  ISOFS appears to be the only one
> in which I'd missed updating the callers.  I've sent you a patch for it.
>
> Note that I expressed reservations about three filesystems in the cover note
> (FAT, HPPFS and HOSTFS), but nothing seems to have come of it.
>
Hi,

The oops is at iput, I use 'return NULL ' is because I don't want to
change the the behaviour of iput in fs/inode.c.

Regards
dave
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