[PATCH 6/7] VFS: BUG_ON() rehash of an already hashed dentry

[Valerie Aurora <vaurora@redhat.com>]

From: Jan Blunck <jblunck@suse.de>

BUG_ON() rehash of an already hashed dentry.  For debugging of
dcache-related development.

Signed-off-by: Jan Blunck <jblunck@suse.de>
Signed-off-by: Valerie Aurora <vaurora@redhat.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
---
 fs/dcache.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/fs/dcache.c b/fs/dcache.c
index a100fa3..74d4ca9 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1551,6 +1551,7 @@ 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);
-- 
1.5.6.5