linux-kernel - [PATCH] igrab() should check for I

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Date:	Tue, 19 Dec 2006 10:57:56 +0100
From:	Jan Blunck <jblunck@...e.de>
To:	Andrew Morton <akpm@...l.org>
Cc:	Linux-Kernel Mailinglist <linux-kernel@...r.kernel.org>,
	Vandana Rungta <vandana@...ell.com>
Subject: [PATCH] igrab() should check for I_CLEAR

When igrab() is calling __iget() on an inode it should check if clear_inode()
has been called on the inode already. Otherwise there is a race window between
clear_inode() and destroy_inode() where igrab() calls __iget() which leads to
already free inodes on the inode lists.

Signed-off-by: Vandana Rungta <vandana@...ell.com>
Signed-off-by: Jan Blunck <jblunck@...e.de>
---
 fs/inode.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6/fs/inode.c
===================================================================
--- linux-2.6.orig/fs/inode.c
+++ linux-2.6/fs/inode.c
@@ -709,7 +709,7 @@ EXPORT_SYMBOL(iunique);
 struct inode *igrab(struct inode *inode)
 {
 	spin_lock(&inode_lock);
-	if (!(inode->i_state & (I_FREEING|I_WILL_FREE)))
+	if (!(inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE)))
 		__iget(inode);
 	else
 		/*
-
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