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gefs: bring back write cancellation for free blocks.

--- a/sys/src/cmd/gefs/blk.c

+++ b/sys/src/cmd/gefs/blk.c

@@ -955,6 +955,10 @@

 			qe.op = Qfree;

 			qe.bp = f->bp;

 			qe.b = nil;

+			if((b = cacheget(f->bp.addr)) != nil){

+				setflag(b, Bfreed);

+				dropblk(b);

+			}

 			qput(a->sync, qe);

 			qlock(&fs->bfreelk);

 			f->next = fs->bfree;

-- 

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