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Message-ID: <20091217095214.GA16810@elte.hu>
Date: Thu, 17 Dec 2009 10:52:14 +0100
From: Ingo Molnar <mingo@...e.hu>
To: Al Viro <viro@...IV.linux.org.uk>
Cc: linux-kernel@...r.kernel.org,
Linus Torvalds <torvalds@...ux-foundation.org>,
Christoph Hellwig <hch@....de>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Andrew Morton <akpm@...ux-foundation.org>,
Dave Chinner <david@...morbit.com>,
Badari Pulavarty <pbadari@...ibm.com>,
Jeff Moyer <jmoyer@...hat.com>,
Jens Axboe <jens.axboe@...cle.com>,
Zach Brown <zach.brown@...cle.com>,
Alex Elder <aelder@....com>, Mark Fasheh <mfasheh@...e.com>,
Joel Becker <joel.becker@...cle.com>
Subject: Re: -tip: origin tree boot crash
* Ingo Molnar <mingo@...e.hu> wrote:
>
> * Al Viro <viro@...IV.linux.org.uk> wrote:
>
> > On Thu, Dec 17, 2009 at 10:02:50AM +0100, Ingo Molnar wrote:
> > >
> > > Today's -tip crashes during bootup on one of my testsystems, and i've bisected
> > > it back to this commit:
> > >
> > > | 5fe878ae7f82fbf0830dbfaee4c5ca18f3aee442 is the first bad commit
> > > | commit 5fe878ae7f82fbf0830dbfaee4c5ca18f3aee442
> > > | Author: Christoph Hellwig <hch@....de>
> > > | Date: Tue Dec 15 16:47:50 2009 -0800
> > > |
> > > | direct-io: cleanup blockdev_direct_IO locking
> > > |
> > > | Currently the locking in blockdev_direct_IO is a mess, we have three
> > > | different locking types and very confusing checks for some of them. The
> > > | most complicated one is DIO_OWN_LOCKING for reads, which happens to not
> > > | actually be used.
> > >
> > > I have no bootlog available currently. The kernel config is attached.
> > >
> > > I've reverted the patch from -tip for now.
> >
> > How about this:
> >
> > diff --git a/fs/direct-io.c b/fs/direct-io.c
> > index 4012885..e82adc2 100644
> > --- a/fs/direct-io.c
> > +++ b/fs/direct-io.c
> > @@ -1206,7 +1206,7 @@ __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
> > * NOTE: filesystems with their own locking have to handle this
> > * on their own.
> > */
> > - if (dio->flags & DIO_LOCKING) {
> > + if (flags & DIO_LOCKING) {
> > if (unlikely((rw & WRITE) && retval < 0)) {
> > loff_t isize = i_size_read(inode);
> > if (end > isize)
>
> thanks, will check this.
Fixes the crash, thanks Al!
Tested-by: Ingo Molnar <mingo@...e.hu>
Ingo
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