linux-kernel - [PATCH 01/41] VFS: BUG() if somebody tries to rehash an already hashed dentry

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Message-Id: <1256152779-10054-2-git-send-email-vaurora@redhat.com>
Date:	Wed, 21 Oct 2009 12:18:59 -0700
From:	Valerie Aurora <vaurora@...hat.com>
To:	Jan Blunck <jblunck@...e.de>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Christoph Hellwig <hch@...radead.org>,
	Andy Whitcroft <apw@...onical.com>,
	Scott James Remnant <scott@...onical.com>,
	Sandu Popa Marius <sandupopamarius@...il.com>,
	Jan Rekorajski <baggins@...h.mimuw.edu.pl>,
	"J. R. Okajima" <hooanon05@...oo.co.jp>,
	Arnd Bergmann <arnd@...db.de>,
	Vladimir Dronnikov <dronnikov@...il.com>,
	Felix Fietkau <nbd@...nwrt.org>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Jan Blunck <jblunck@...e.de>
Subject: [PATCH 01/41] VFS: BUG() if somebody tries to rehash an already hashed dentry

From: Jan Blunck <jblunck@...e.de>

Break early when somebody tries to rehash an already hashed dentry.
Otherwise this leads to interesting corruptions in the dcache hash table
later on.

Signed-off-by: Jan Blunck <jblunck@...e.de>
Signed-off-by: Valerie Aurora <vaurora@...hat.com>
---
 fs/dcache.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/fs/dcache.c b/fs/dcache.c
index 9e5cd3c..38bf982 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1550,6 +1550,7 @@ void d_rehash(struct dentry * entry)
 {
 	spin_lock(&dcache_lock);
 	spin_lock(&entry->d_lock);
+	BUG_ON(!d_unhashed(entry));
 	_d_rehash(entry);
 	spin_unlock(&entry->d_lock);
 	spin_unlock(&dcache_lock);
-- 
1.6.3.3

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