fw: [PATCH] fix instant oops with tracing enabled

[Dave Chinner <david@fromorbit.com>]

SGI folks,

Looks like Christoph is having problems posting to the list;
the spam filter is dropping all his mail. In the mean time,
here's a fix for an oops in the tracing code as a result of
the last check ins. I didn't see this because the "combine
inodes" patches removes xfs_icount altogether. If that
series is going to be included in the current round of checkins
then this patch probably isn't needed.

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com


From: Christoph Hellwig <hch@lst.de>

We can only read inode->i_count if the inode is actually there and not
a NULL pointer.  This was introduced in one of the recent sync patches.

Signed-off-by: Christoph Hellwig <hch@lst.de>

Index: linux-2.6-xfs/fs/xfs/linux-2.6/xfs_vnode.c
===================================================================
--- linux-2.6-xfs.orig/fs/xfs/linux-2.6/xfs_vnode.c	2008-10-13 12:07:38.000000000 -0400
+++ linux-2.6-xfs/fs/xfs/linux-2.6/xfs_vnode.c	2008-10-13 12:07:47.000000000 -0400
@@ -92,7 +92,7 @@ static inline int xfs_icount(struct xfs_
 {
 	struct inode *inode = VFS_I(ip);
 
-	if (!inode)
+	if (inode)
 		return atomic_read(&inode->i_count);
 	return -1;
 }