linux-kernel - Re: [PATCH: 2.6.20-rc4-mm1] JFS: Avoid deadlock introduced by explicit I/O plugging

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Date:	Thu, 18 Jan 2007 01:30:19 -0500
From:	Josef Sipek <jsipek@....cs.sunysb.edu>
To:	Dave Kleikamp <shaggy@...ux.vnet.ibm.com>
Cc:	Jens Axboe <jens.axboe@...cle.com>,
	JFS Discussion <jfs-discussion@...ts.sourceforge.net>,
	fsdevel <linux-fsdevel@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Nick Piggin <nickpiggin@...oo.com.au>
Subject: Re: [PATCH: 2.6.20-rc4-mm1] JFS: Avoid deadlock introduced by explicit I/O plugging

On Wed, Jan 17, 2007 at 04:55:49PM -0600, Dave Kleikamp wrote:
...
> diff -Nurp linux-2.6.20-rc4-mm1/fs/jfs/jfs_lock.h linux/fs/jfs/jfs_lock.h
> --- linux-2.6.20-rc4-mm1/fs/jfs/jfs_lock.h	2006-11-29 15:57:37.000000000 -0600
> +++ linux/fs/jfs/jfs_lock.h	2007-01-17 15:30:19.000000000 -0600
> @@ -22,6 +22,7 @@
>  #include <linux/spinlock.h>
>  #include <linux/mutex.h>
>  #include <linux/sched.h>
> +#include <linux/blkdev.h>
>  
>  /*
>   *	jfs_lock.h
> @@ -42,6 +43,7 @@ do {							\
>  		if (cond)				\
>  			break;				\
>  		unlock_cmd;				\
> +		blk_replug_current_nested();		\
>  		schedule();				\
>  		lock_cmd;				\
>  	}						\

Is {,un}lock_cmd a macro? ...

Jeff.

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