Commit 5b484a51 authored Jul 01, 2016 by Jeff Layton Committed by Ilya Dryomov Jul 28, 2016

ceph: clear d_fsinfo pointer under d_lock



To check for a valid dentry lease, we need to get at the
ceph_dentry_info. Under rcuwalk though, we may end up with a dentry that
is on its way to destruction. Since we need to take the d_lock in
dentry_lease_is_valid already, we can just ensure that we clear the
d_fsinfo pointer out under the same lock before destroying it.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Reviewed-by: Yan, Zheng <zyan@redhat.com>

parent 8aa152c7

fs/ceph/dir.c

+5 −1

Original line number	Diff line number	Diff line
		@@ -1286,10 +1286,14 @@ static void ceph_d_release(struct dentry *dentry)

		dout("d_release %p\n", dentry);
		ceph_dentry_lru_del(dentry);

		spin_lock(&dentry->d_lock);
		dentry->d_fsdata = NULL;
		spin_unlock(&dentry->d_lock);

		if (di->lease_session)
		ceph_put_mds_session(di->lease_session);
		kmem_cache_free(ceph_dentry_cachep, di);
		dentry->d_fsdata = NULL;
		}

		static int ceph_snapdir_d_revalidate(struct dentry *dentry,