From: Miklos Szeredi <mszeredi@suse.cz>
Date: Tue, 1 Oct 2013 14:41:22 +0000 (+0200)
Subject: fuse: don't check_submounts_and_drop() in RCU walk
X-Git-Tag: v3.12-rc4~16^2~2
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=3c70b8eeda596069258772afabf2ab0b1aa017f0;p=linux.git

fuse: don't check_submounts_and_drop() in RCU walk

If revalidate finds an invalid dentry in RCU walk mode, let the VFS deal
with it instead of calling check_submounts_and_drop() which is not prepared
for being called from RCU walk.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Cc: stable@vger.kernel.org
---

diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 62b43b577bfc..9b16806f11da 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -259,7 +259,8 @@ static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags)
 
 invalid:
 	ret = 0;
-	if (check_submounts_and_drop(entry) != 0)
+
+	if (!(flags & LOOKUP_RCU) && check_submounts_and_drop(entry) != 0)
 		ret = 1;
 	goto out;
 }