ceph: use READ_ONCE to access d_parent in RCU critical section (41883ba8) · Commits · 戴 / test

fs/ceph/mds_client.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -913,7 +913,7 @@ static int __choose_mds(struct ceph_mds_client *mdsc,
		struct inode *dir;

		rcu_read_lock();
		parent = req->r_dentry->d_parent;
		parent = READ_ONCE(req->r_dentry->d_parent);
		dir = req->r_parent ? : d_inode_rcu(parent);

		if (!dir \|\| dir->i_sb != mdsc->fsc->sb) {
		@@ -2145,7 +2145,7 @@ retry:
		memcpy(path + pos, temp->d_name.name, temp->d_name.len);
		}
		spin_unlock(&temp->d_lock);
		temp = temp->d_parent;
		temp = READ_ONCE(temp->d_parent);

		/* Are we at the root? */
		if (IS_ROOT(temp))