nfs_page_group_sync_on_bit_locked
ret = nfs_page_group_sync_on_bit_locked(req, bit);
nfs_page_group_sync_on_bit_locked(req, PG_UPTODATE))
if (nfs_page_group_sync_on_bit_locked(req, PG_REMOVE)) {
extern bool nfs_page_group_sync_on_bit_locked(struct nfs_page *, unsigned int);