557     OsBcacheBlock *prefer = NULL;  in AllocNewBlock()  local
573     prefer = last + 1;  in AllocNewBlock()
574     if (prefer > bc->wEnd) {  in AllocNewBlock()
575         prefer = bc->wStart;  in AllocNewBlock()
579     if (prefer->used && !prefer->modified) {  in AllocNewBlock()
580         prefer->used = FALSE;  in AllocNewBlock()
581         DelBlock(bc, prefer);  in AllocNewBlock()
584     if (prefer->used) { /* do not combine with next check */  in AllocNewBlock()
585         MergeSyncBlocks(bc, prefer); /* prefer->used may be changed here */  in AllocNewBlock()
588     if (prefer->used) {  in AllocNewBlock()
589         BcacheSyncBlock(bc, prefer);  in AllocNewBlock()
590         DelBlock(bc, prefer);  in AllocNewBlock()
593     prefer->used = TRUE;  in AllocNewBlock()
594     LOS_ListDelete(&prefer->listNode); /* del from free list */  in AllocNewBlock()
596     return prefer;  in AllocNewBlock()