ocfs2: needs ->d_lock to poke in ->d_parent->d_inode from ->d_revalidate()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/ocfs2/dcache.c b/fs/ocfs2/dcache.c
index ef999729e274ead1ed88c699ee86b8011fd5ff77..0d3a97d2d5f659caeb60f20f448ce25371036ff2 100644 (file)
--- a/fs/ocfs2/dcache.c
+++ b/fs/ocfs2/dcache.c
@@ -70,9 +70,10 @@ static int ocfs2_dentry_revalidate(struct dentry *dentry, unsigned int flags)
         */
        if (inode == NULL) {
                unsigned long gen = (unsigned long) dentry->d_fsdata;
-               unsigned long pgen =
-                       OCFS2_I(dentry->d_parent->d_inode)->ip_dir_lock_gen;
-
+               unsigned long pgen;
+               spin_lock(&dentry->d_lock);
+               pgen = OCFS2_I(dentry->d_parent->d_inode)->ip_dir_lock_gen;
+               spin_unlock(&dentry->d_lock);
                trace_ocfs2_dentry_revalidate_negative(dentry->d_name.len,
                                                       dentry->d_name.name,
                                                       pgen, gen);