Mounting overlayfs using other overlayfs instance as lower or upper layer triggers false-positive lockdep warning about possible locking recursion of ->i_mutex in iterate_dir(). Nesting already limited with FILESYSTEM_MAX_STACK_DEPTH = 2 to prevent kernel stack overflow. Overlayfs supports multiple lower layers thus the same configuration could be constructed without nesting. Signed-off-by: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxxxxxx> --- fs/overlayfs/super.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c index e5db31f78c7d..381af9a5ece9 100644 --- a/fs/overlayfs/super.c +++ b/fs/overlayfs/super.c @@ -700,10 +700,13 @@ static bool ovl_is_allowed_fs_type(struct dentry *root) /* * We don't support: + * - overlayfs * - automount filesystems * - filesystems with revalidate (FIXME for lower layer) * - filesystems with case insensitive names */ + if (root->d_sb->s_op == &ovl_super_operations) + return false; if (dop && (dop->d_manage || dop->d_automount || dop->d_revalidate || dop->d_weak_revalidate || -- To unsubscribe from this list: send the line "unsubscribe linux-unionfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
