linux-kernel - Re: -tip: origin tree boot crash

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Date:	Thu, 17 Dec 2009 09:32:16 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Ingo Molnar <mingo@...e.hu>
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

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)
--
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