From: Erez Zadok <ezk@cs.sunysb.edu>
Date: Fri, 15 Feb 2008 22:18:48 +0000 (-0500)
Subject: Unionfs: follow_link locking fixes
X-Git-Tag: unionfs-2.2.4~11
X-Git-Url: https://git.fsl.cs.sunysb.edu/?a=commitdiff_plain;h=384c4b54a2af876f5f3b91ba938905ebb3528cd8;p=unionfs-2.6.31.y.git

Unionfs: follow_link locking fixes

Signed-off-by: Erez Zadok <ezk@cs.sunysb.edu>
---

diff --git a/fs/unionfs/inode.c b/fs/unionfs/inode.c
index 8d939dc1f45..63775333ec1 100644
--- a/fs/unionfs/inode.c
+++ b/fs/unionfs/inode.c
@@ -820,7 +820,11 @@ static void *unionfs_follow_link(struct dentry *dentry, struct nameidata *nd)
 	err = 0;
 
 out:
-	unionfs_check_dentry(dentry);
+	if (!err) {
+		unionfs_lock_dentry(dentry, UNIONFS_DMUTEX_CHILD);
+		unionfs_check_dentry(dentry);
+		unionfs_unlock_dentry(dentry);
+	}
 	unionfs_check_nd(nd);
 	return ERR_PTR(err);
 }