/* * These macros are used to bracket ULFS directory ops, so that we can * identify all the pages touched during directory ops which need to * be ordered and flushed atomically, so that they may be recovered. * * Because we have to mark nodes VU_DIROP in order to prevent * the cache from reclaiming them while a dirop is in progress, we must * also manage the number of nodes so marked (otherwise we can run out). * We do this by setting lfs_dirvcount to the number of marked vnodes; it * is decremented during segment write, when VU_DIROP is taken off. */